---
_id: '11852'
abstract:
- lang: eng
  text: We present a general framework of designing efficient dynamic approximate
    algorithms for optimization problems on undirected graphs. In particular, we develop
    a technique that, given any problem that admits a certain notion of vertex sparsifiers,
    gives data structures that maintain approximate solutions in sub-linear update
    and query time. We illustrate the applicability of our paradigm to the following
    problems. (1)A fully-dynamic algorithm that approximates all-pair maximum-flows/minimum-cuts
    up to a nearly logarithmic factor in O~(n2/3) 11The O~(⋅) notation is used in
    this paper to hide poly-logarithmic factors. amortized time against an oblivious
    adversary, and O~(m3/4) time against an adaptive adversary. (2)An incremental
    data structure that maintains O(1) - approximate shortest path in no(1) time per
    operation, as well as fully dynamic approximate all-pair shortest path and transshipment
    in O~(n2/3+o(1)) amortized time per operation. (3)A fully-dynamic algorithm that
    approximates all-pair effective resistance up to an (1+ϵ) factor in O~(n2/3+o(1)ϵ−O(1))
    amortized update time per operation. The key tool behind result (1) is the dynamic
    maintenance of an algorithmic construction due to Madry [FOCS' 10], which partitions
    a graph into a collection of simpler graph structures (known as j-trees) and approximately
    captures the cut-flow and metric structure of the graph. The O(1)-approximation
    guarantee of (2) is by adapting the distance oracles by [Thorup-Zwick JACM '05].
    Result (3) is obtained by invoking the random-walk based spectral vertex sparsifier
    by [Durfee et al. STOC '19] in a hierarchical manner, while carefully keeping
    track of the recourse among levels in the hierarchy. See https://arxiv.org/pdf/2005.02368.pdf
    for the full version of this paper.
article_processing_charge: No
arxiv: 1
author:
- first_name: Li
  full_name: Chen, Li
  last_name: Chen
- first_name: Gramoz
  full_name: Goranci, Gramoz
  last_name: Goranci
- first_name: Monika H
  full_name: Henzinger, Monika H
  id: 540c9bbd-f2de-11ec-812d-d04a5be85630
  last_name: Henzinger
  orcid: 0000-0002-5008-6530
- first_name: Richard
  full_name: Peng, Richard
  last_name: Peng
- first_name: Thatchaphol
  full_name: Saranurak, Thatchaphol
  last_name: Saranurak
citation:
  ama: 'Chen L, Goranci G, Henzinger MH, Peng R, Saranurak T. Fast dynamic cuts, distances
    and effective resistances via vertex sparsifiers. In: <i>61st Annual Symposium
    on Foundations of Computer Science</i>. Institute of Electrical and Electronics
    Engineers; 2020:1135-1146. doi:<a href="https://doi.org/10.1109/focs46700.2020.00109">10.1109/focs46700.2020.00109</a>'
  apa: 'Chen, L., Goranci, G., Henzinger, M. H., Peng, R., &#38; Saranurak, T. (2020).
    Fast dynamic cuts, distances and effective resistances via vertex sparsifiers.
    In <i>61st Annual Symposium on Foundations of Computer Science</i> (pp. 1135–1146).
    Durham, NC, United States: Institute of Electrical and Electronics Engineers.
    <a href="https://doi.org/10.1109/focs46700.2020.00109">https://doi.org/10.1109/focs46700.2020.00109</a>'
  chicago: Chen, Li, Gramoz Goranci, Monika H Henzinger, Richard Peng, and Thatchaphol
    Saranurak. “Fast Dynamic Cuts, Distances and Effective Resistances via Vertex
    Sparsifiers.” In <i>61st Annual Symposium on Foundations of Computer Science</i>,
    1135–46. Institute of Electrical and Electronics Engineers, 2020. <a href="https://doi.org/10.1109/focs46700.2020.00109">https://doi.org/10.1109/focs46700.2020.00109</a>.
  ieee: L. Chen, G. Goranci, M. H. Henzinger, R. Peng, and T. Saranurak, “Fast dynamic
    cuts, distances and effective resistances via vertex sparsifiers,” in <i>61st
    Annual Symposium on Foundations of Computer Science</i>, Durham, NC, United States,
    2020, pp. 1135–1146.
  ista: 'Chen L, Goranci G, Henzinger MH, Peng R, Saranurak T. 2020. Fast dynamic
    cuts, distances and effective resistances via vertex sparsifiers. 61st Annual
    Symposium on Foundations of Computer Science. FOCS: Annual Symposium on Foundations
    of Computer Science, 1135–1146.'
  mla: Chen, Li, et al. “Fast Dynamic Cuts, Distances and Effective Resistances via
    Vertex Sparsifiers.” <i>61st Annual Symposium on Foundations of Computer Science</i>,
    Institute of Electrical and Electronics Engineers, 2020, pp. 1135–46, doi:<a href="https://doi.org/10.1109/focs46700.2020.00109">10.1109/focs46700.2020.00109</a>.
  short: L. Chen, G. Goranci, M.H. Henzinger, R. Peng, T. Saranurak, in:, 61st Annual
    Symposium on Foundations of Computer Science, Institute of Electrical and Electronics
    Engineers, 2020, pp. 1135–1146.
conference:
  end_date: 2020-11-19
  location: Durham, NC, United States
  name: 'FOCS: Annual Symposium on Foundations of Computer Science'
  start_date: 2020-11-16
date_created: 2022-08-16T07:33:12Z
date_published: 2020-11-01T00:00:00Z
date_updated: 2023-02-17T09:47:36Z
day: '01'
doi: 10.1109/focs46700.2020.00109
extern: '1'
external_id:
  arxiv:
  - '2005.02368'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2005.02368
month: '11'
oa: 1
oa_version: Preprint
page: 1135-1146
publication: 61st Annual Symposium on Foundations of Computer Science
publication_identifier:
  eisbn:
  - 978-1-7281-9621-3
  eissn:
  - 2575-8454
  isbn:
  - 978-1-7281-9622-0
publication_status: published
publisher: Institute of Electrical and Electronics Engineers
quality_controlled: '1'
scopus_import: '1'
status: public
title: Fast dynamic cuts, distances and effective resistances via vertex sparsifiers
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '11880'
abstract:
- lang: eng
  text: "Given a directed graph and a source vertex, the fully dynamic single-source
    reachability problem is to maintain the set of vertices that are reachable from
    the given vertex, subject to edge deletions and insertions. It is one of the most
    fundamental problems on graphs and appears directly or indirectly in many and
    varied applications. While there has been theoretical work on this problem, showing
    both linear conditional lower bounds for the fully dynamic problem and insertions-only
    and deletions-only upper bounds beating these conditional lower bounds, there
    has been no experimental study that compares the performance of fully dynamic
    reachability algorithms in practice. Previous experimental studies in this area
    concentrated only on the more general all-pairs reachability or transitive closure
    problem and did not use real-world dynamic graphs.\r\n\r\nIn this paper, we bridge
    this gap by empirically studying an extensive set of algorithms for the single-source
    reachability problem in the fully dynamic setting. In particular, we design several
    fully dynamic variants of well-known approaches to obtain and maintain reachability
    information with respect to a distinguished source. Moreover, we extend the existing
    insertions-only or deletions-only upper bounds into fully dynamic algorithms.
    Even though the worst-case time per operation of all the fully dynamic algorithms
    we evaluate is at least linear in the number of edges in the graph (as is to be
    expected given the conditional lower bounds) we show in our extensive experimental
    evaluation that their performance differs greatly, both on generated as well as
    on real-world instances."
article_processing_charge: No
arxiv: 1
author:
- first_name: Kathrin
  full_name: Hanauer, Kathrin
  last_name: Hanauer
- first_name: Monika H
  full_name: Henzinger, Monika H
  id: 540c9bbd-f2de-11ec-812d-d04a5be85630
  last_name: Henzinger
  orcid: 0000-0002-5008-6530
- first_name: Christian
  full_name: Schulz, Christian
  last_name: Schulz
citation:
  ama: 'Hanauer K, Henzinger MH, Schulz C. Fully dynamic single-source reachability
    in practice: An experimental study. In: <i>2020 Symposium on Algorithm Engineering
    and Experiments</i>. Society for Industrial and Applied Mathematics; 2020:106-119.
    doi:<a href="https://doi.org/10.1137/1.9781611976007.9">10.1137/1.9781611976007.9</a>'
  apa: 'Hanauer, K., Henzinger, M. H., &#38; Schulz, C. (2020). Fully dynamic single-source
    reachability in practice: An experimental study. In <i>2020 Symposium on Algorithm
    Engineering and Experiments</i> (pp. 106–119). Salt Lake City, UT, United States:
    Society for Industrial and Applied Mathematics. <a href="https://doi.org/10.1137/1.9781611976007.9">https://doi.org/10.1137/1.9781611976007.9</a>'
  chicago: 'Hanauer, Kathrin, Monika H Henzinger, and Christian Schulz. “Fully Dynamic
    Single-Source Reachability in Practice: An Experimental Study.” In <i>2020 Symposium
    on Algorithm Engineering and Experiments</i>, 106–19. Society for Industrial and
    Applied Mathematics, 2020. <a href="https://doi.org/10.1137/1.9781611976007.9">https://doi.org/10.1137/1.9781611976007.9</a>.'
  ieee: 'K. Hanauer, M. H. Henzinger, and C. Schulz, “Fully dynamic single-source
    reachability in practice: An experimental study,” in <i>2020 Symposium on Algorithm
    Engineering and Experiments</i>, Salt Lake City, UT, United States, 2020, pp.
    106–119.'
  ista: 'Hanauer K, Henzinger MH, Schulz C. 2020. Fully dynamic single-source reachability
    in practice: An experimental study. 2020 Symposium on Algorithm Engineering and
    Experiments. ALENEX: Symposium on Algorithm Engineering and Experiments, 106–119.'
  mla: 'Hanauer, Kathrin, et al. “Fully Dynamic Single-Source Reachability in Practice:
    An Experimental Study.” <i>2020 Symposium on Algorithm Engineering and Experiments</i>,
    Society for Industrial and Applied Mathematics, 2020, pp. 106–19, doi:<a href="https://doi.org/10.1137/1.9781611976007.9">10.1137/1.9781611976007.9</a>.'
  short: K. Hanauer, M.H. Henzinger, C. Schulz, in:, 2020 Symposium on Algorithm Engineering
    and Experiments, Society for Industrial and Applied Mathematics, 2020, pp. 106–119.
conference:
  end_date: 2020-01-06
  location: Salt Lake City, UT, United States
  name: 'ALENEX: Symposium on Algorithm Engineering and Experiments'
  start_date: 2020-01-05
date_created: 2022-08-17T06:39:32Z
date_published: 2020-01-01T00:00:00Z
date_updated: 2023-02-17T14:00:37Z
day: '01'
doi: 10.1137/1.9781611976007.9
extern: '1'
external_id:
  arxiv:
  - '1905.01216'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1905.01216
month: '01'
oa: 1
oa_version: Preprint
page: 106-119
publication: 2020 Symposium on Algorithm Engineering and Experiments
publication_identifier:
  eisbn:
  - 978-1-61197-600-7
publication_status: published
publisher: Society for Industrial and Applied Mathematics
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Fully dynamic single-source reachability in practice: An experimental study'
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '11881'
abstract:
- lang: eng
  text: We introduce the fastest known exact algorithm for the multiterminal cut problem
    with k terminals. In particular, we engineer existing as well as new data reduction
    rules. We use the rules within a branch-and-reduce framework and to boost the
    performance of an ILP formulation. Our algorithms achieve improvements in running
    time of up to multiple orders of magnitudes over the ILP formulation without data
    reductions, which has been the de facto standard used by practitioners. This allows
    us to solve instances to optimality that are significantly larger than was previously
    possible.
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
  full_name: Henzinger, Monika H
  id: 540c9bbd-f2de-11ec-812d-d04a5be85630
  last_name: Henzinger
  orcid: 0000-0002-5008-6530
- first_name: Alexander
  full_name: Noe, Alexander
  last_name: Noe
- first_name: Christian
  full_name: Schulz, Christian
  last_name: Schulz
citation:
  ama: 'Henzinger MH, Noe A, Schulz C. Shared-memory branch-and-reduce for multiterminal
    cuts. In: <i>2020 Symposium on Algorithm Engineering and Experiments</i>. Society
    for Industrial and Applied Mathematics; 2020:42-55. doi:<a href="https://doi.org/10.1137/1.9781611976007.4">10.1137/1.9781611976007.4</a>'
  apa: 'Henzinger, M. H., Noe, A., &#38; Schulz, C. (2020). Shared-memory branch-and-reduce
    for multiterminal cuts. In <i>2020 Symposium on Algorithm Engineering and Experiments</i>
    (pp. 42–55). Salt Lake City, UT, United States: Society for Industrial and Applied
    Mathematics. <a href="https://doi.org/10.1137/1.9781611976007.4">https://doi.org/10.1137/1.9781611976007.4</a>'
  chicago: Henzinger, Monika H, Alexander Noe, and Christian Schulz. “Shared-Memory
    Branch-and-Reduce for Multiterminal Cuts.” In <i>2020 Symposium on Algorithm Engineering
    and Experiments</i>, 42–55. Society for Industrial and Applied Mathematics, 2020.
    <a href="https://doi.org/10.1137/1.9781611976007.4">https://doi.org/10.1137/1.9781611976007.4</a>.
  ieee: M. H. Henzinger, A. Noe, and C. Schulz, “Shared-memory branch-and-reduce for
    multiterminal cuts,” in <i>2020 Symposium on Algorithm Engineering and Experiments</i>,
    Salt Lake City, UT, United States, 2020, pp. 42–55.
  ista: 'Henzinger MH, Noe A, Schulz C. 2020. Shared-memory branch-and-reduce for
    multiterminal cuts. 2020 Symposium on Algorithm Engineering and Experiments. ALENEX:
    Symposium on Algorithm Engineering and Experiments, 42–55.'
  mla: Henzinger, Monika H., et al. “Shared-Memory Branch-and-Reduce for Multiterminal
    Cuts.” <i>2020 Symposium on Algorithm Engineering and Experiments</i>, Society
    for Industrial and Applied Mathematics, 2020, pp. 42–55, doi:<a href="https://doi.org/10.1137/1.9781611976007.4">10.1137/1.9781611976007.4</a>.
  short: M.H. Henzinger, A. Noe, C. Schulz, in:, 2020 Symposium on Algorithm Engineering
    and Experiments, Society for Industrial and Applied Mathematics, 2020, pp. 42–55.
conference:
  end_date: 2020-01-06
  location: Salt Lake City, UT, United States
  name: 'ALENEX: Symposium on Algorithm Engineering and Experiments'
  start_date: 2020-01-05
date_created: 2022-08-17T06:47:40Z
date_published: 2020-01-01T00:00:00Z
date_updated: 2023-02-17T14:02:04Z
day: '01'
doi: 10.1137/1.9781611976007.4
extern: '1'
external_id:
  arxiv:
  - '1908.04141'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1908.04141
month: '01'
oa: 1
oa_version: Preprint
page: 42-55
publication: 2020 Symposium on Algorithm Engineering and Experiments
publication_identifier:
  eisbn:
  - 978-1-61197-600-7
publication_status: published
publisher: Society for Industrial and Applied Mathematics
quality_controlled: '1'
scopus_import: '1'
status: public
title: Shared-memory branch-and-reduce for multiterminal cuts
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '11889'
abstract:
- lang: eng
  text: "We study the problem of computing a minimum cut in a simple, undirected graph
    and give a deterministic \U0001D442(\U0001D45Alog2\U0001D45Bloglog2\U0001D45B)
    time algorithm. This improves on both the best previously known deterministic
    running time of \U0001D442(\U0001D45Alog12\U0001D45B) (Kawarabayashi and Thorup
    [J. ACM, 66 (2018), 4]) and the best previously known randomized running time
    of \U0001D442(\U0001D45Alog3\U0001D45B) (Karger [J. ACM, 47 (2000), pp. 46--76])
    for this problem, though Karger's algorithm can be further applied to weighted
    graphs. Moreover, our result extends to balanced directed graphs, where the balance
    of a directed graph captures how close the graph is to being Eulerian. Our approach
    is using the Kawarabayashi and Thorup graph compression technique, which repeatedly
    finds low conductance cuts. To find these cuts they use a diffusion-based local
    algorithm. We use instead a flow-based local algorithm and suitably adjust their
    framework to work with our flow-based subroutine. Both flow- and diffusion-based
    methods have a long history of being applied to finding low conductance cuts.
    Diffusion algorithms have several variants that are naturally local, while it
    is more complicated to make flow methods local. Some prior work has proven nice
    properties for local flow-based algorithms with respect to improving or cleaning
    up low conductance cuts. Our flow subroutine, however, is the first that both
    is local and produces low conductance cuts. Thus, it may be of independent interest."
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Monika H
  full_name: Henzinger, Monika H
  id: 540c9bbd-f2de-11ec-812d-d04a5be85630
  last_name: Henzinger
  orcid: 0000-0002-5008-6530
- first_name: Satish
  full_name: Rao, Satish
  last_name: Rao
- first_name: Di
  full_name: Wang, Di
  last_name: Wang
citation:
  ama: Henzinger MH, Rao S, Wang D. Local flow partitioning for faster edge connectivity.
    <i>SIAM Journal on Computing</i>. 2020;49(1):1-36. doi:<a href="https://doi.org/10.1137/18m1180335">10.1137/18m1180335</a>
  apa: Henzinger, M. H., Rao, S., &#38; Wang, D. (2020). Local flow partitioning for
    faster edge connectivity. <i>SIAM Journal on Computing</i>. Society for Industrial
    &#38; Applied Mathematics. <a href="https://doi.org/10.1137/18m1180335">https://doi.org/10.1137/18m1180335</a>
  chicago: Henzinger, Monika H, Satish Rao, and Di Wang. “Local Flow Partitioning
    for Faster Edge Connectivity.” <i>SIAM Journal on Computing</i>. Society for Industrial
    &#38; Applied Mathematics, 2020. <a href="https://doi.org/10.1137/18m1180335">https://doi.org/10.1137/18m1180335</a>.
  ieee: M. H. Henzinger, S. Rao, and D. Wang, “Local flow partitioning for faster
    edge connectivity,” <i>SIAM Journal on Computing</i>, vol. 49, no. 1. Society
    for Industrial &#38; Applied Mathematics, pp. 1–36, 2020.
  ista: Henzinger MH, Rao S, Wang D. 2020. Local flow partitioning for faster edge
    connectivity. SIAM Journal on Computing. 49(1), 1–36.
  mla: Henzinger, Monika H., et al. “Local Flow Partitioning for Faster Edge Connectivity.”
    <i>SIAM Journal on Computing</i>, vol. 49, no. 1, Society for Industrial &#38;
    Applied Mathematics, 2020, pp. 1–36, doi:<a href="https://doi.org/10.1137/18m1180335">10.1137/18m1180335</a>.
  short: M.H. Henzinger, S. Rao, D. Wang, SIAM Journal on Computing 49 (2020) 1–36.
date_created: 2022-08-17T08:09:31Z
date_published: 2020-01-01T00:00:00Z
date_updated: 2023-02-21T16:31:25Z
day: '01'
doi: 10.1137/18m1180335
extern: '1'
external_id:
  arxiv:
  - '1704.01254'
intvolume: '        49'
issue: '1'
language:
- iso: eng
main_file_link:
- url: https://arxiv.org/abs/1704.01254
month: '01'
oa_version: Preprint
page: 1-36
publication: SIAM Journal on Computing
publication_identifier:
  eissn:
  - 1095-7111
  issn:
  - 0097-5397
publication_status: published
publisher: Society for Industrial & Applied Mathematics
quality_controlled: '1'
related_material:
  record:
  - id: '11873'
    relation: later_version
    status: public
scopus_import: '1'
status: public
title: Local flow partitioning for faster edge connectivity
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 49
year: '2020'
...
---
_id: '11894'
abstract:
- lang: eng
  text: "Graph sparsification aims at compressing large graphs into smaller ones while
    preserving important characteristics of the input graph. In this work we study
    vertex sparsifiers, i.e., sparsifiers whose goal is to reduce the number of vertices.
    We focus on the following notions: (1) Given a digraph \U0001D43A=(\U0001D449,\U0001D438)
    and terminal vertices \U0001D43E⊂\U0001D449 with |\U0001D43E|=\U0001D458, a (vertex)
    reachability sparsifier of \U0001D43A is a digraph \U0001D43B=(\U0001D449\U0001D43B,\U0001D438\U0001D43B),
    \U0001D43E⊂\U0001D449\U0001D43B that preserves all reachability information among
    terminal pairs. Let |\U0001D449\U0001D43B| denote the size of \U0001D43B. In this
    work we introduce the notion of reachability-preserving minors (RPMs), i.e., we
    require \U0001D43B to be a minor of \U0001D43A. We show any directed graph \U0001D43A
    admits an RPM \U0001D43B of size \U0001D442(\U0001D4583), and if \U0001D43A is
    planar, then the size of \U0001D43B improves to \U0001D442(\U0001D4582log\U0001D458).
    We complement our upper bound by showing that there exists an infinite family
    of grids such that any RPM must have Ω(\U0001D4582) vertices. (2) Given a weighted
    undirected graph \U0001D43A=(\U0001D449,\U0001D438) and terminal vertices \U0001D43E
    with |\U0001D43E|=\U0001D458, an exact (vertex) cut sparsifier of \U0001D43A is
    a graph \U0001D43B with \U0001D43E⊂\U0001D449\U0001D43B that preserves the value
    of minimum cuts separating any bipartition of \U0001D43E. We show that planar
    graphs with all the \U0001D458 terminals lying on the same face admit exact cut
    sparsifiers of size \U0001D442(\U0001D4582) that are also planar. Our result extends
    to flow and distance sparsifiers. It improves the previous best-known bound of
    \U0001D442(\U0001D458222\U0001D458) for cut and flow sparsifiers by an exponential
    factor and matches an Ω(\U0001D4582) lower-bound for this class of graphs."
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Gramoz
  full_name: Goranci, Gramoz
  last_name: Goranci
- first_name: Monika H
  full_name: Henzinger, Monika H
  id: 540c9bbd-f2de-11ec-812d-d04a5be85630
  last_name: Henzinger
  orcid: 0000-0002-5008-6530
- first_name: Pan
  full_name: Peng, Pan
  last_name: Peng
citation:
  ama: Goranci G, Henzinger MH, Peng P. Improved guarantees for vertex sparsification
    in planar graphs. <i>SIAM Journal on Discrete Mathematics</i>. 2020;34(1):130-162.
    doi:<a href="https://doi.org/10.1137/17m1163153">10.1137/17m1163153</a>
  apa: Goranci, G., Henzinger, M. H., &#38; Peng, P. (2020). Improved guarantees for
    vertex sparsification in planar graphs. <i>SIAM Journal on Discrete Mathematics</i>.
    Society for Industrial &#38; Applied Mathematics. <a href="https://doi.org/10.1137/17m1163153">https://doi.org/10.1137/17m1163153</a>
  chicago: Goranci, Gramoz, Monika H Henzinger, and Pan Peng. “Improved Guarantees
    for Vertex Sparsification in Planar Graphs.” <i>SIAM Journal on Discrete Mathematics</i>.
    Society for Industrial &#38; Applied Mathematics, 2020. <a href="https://doi.org/10.1137/17m1163153">https://doi.org/10.1137/17m1163153</a>.
  ieee: G. Goranci, M. H. Henzinger, and P. Peng, “Improved guarantees for vertex
    sparsification in planar graphs,” <i>SIAM Journal on Discrete Mathematics</i>,
    vol. 34, no. 1. Society for Industrial &#38; Applied Mathematics, pp. 130–162,
    2020.
  ista: Goranci G, Henzinger MH, Peng P. 2020. Improved guarantees for vertex sparsification
    in planar graphs. SIAM Journal on Discrete Mathematics. 34(1), 130–162.
  mla: Goranci, Gramoz, et al. “Improved Guarantees for Vertex Sparsification in Planar
    Graphs.” <i>SIAM Journal on Discrete Mathematics</i>, vol. 34, no. 1, Society
    for Industrial &#38; Applied Mathematics, 2020, pp. 130–62, doi:<a href="https://doi.org/10.1137/17m1163153">10.1137/17m1163153</a>.
  short: G. Goranci, M.H. Henzinger, P. Peng, SIAM Journal on Discrete Mathematics
    34 (2020) 130–162.
date_created: 2022-08-17T08:50:24Z
date_published: 2020-01-01T00:00:00Z
date_updated: 2023-02-21T16:29:44Z
day: '01'
doi: 10.1137/17m1163153
extern: '1'
external_id:
  arxiv:
  - '1702.01136'
intvolume: '        34'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1702.01136
month: '01'
oa: 1
oa_version: Preprint
page: 130-162
publication: SIAM Journal on Discrete Mathematics
publication_identifier:
  eissn:
  - 1095-7146
  issn:
  - 0895-4801
publication_status: published
publisher: Society for Industrial & Applied Mathematics
quality_controlled: '1'
related_material:
  record:
  - id: '11831'
    relation: earlier_version
    status: public
scopus_import: '1'
status: public
title: Improved guarantees for vertex sparsification in planar graphs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 34
year: '2020'
...
---
_id: '11954'
abstract:
- lang: eng
  text: The combination of nickel and photocatalysis has unlocked a variety of cross-couplings.
    These protocols rely on a few photocatalysts that can only convert a small portion
    of visible light (<500 nm) into chemical energy. The high-energy photons that
    excite the photocatalyst can result in unwanted side reactions. Dyes that absorb
    a much broader spectrum of light are not applicable because of their short-lived
    singlet excited states. Here, we describe a self-assembling catalyst system that
    overcomes this limitation. Immobilization of a nickel catalyst on dye-sensitized
    titanium dioxide results in a material that catalyzes carbon–heteroatom and carbon–carbon
    bond formations. The modular approach of dye-sensitized metallaphotocatalysts
    accesses the entire visible light spectrum and allows tackling selectivity issues
    resulting from low wavelengths strategically. The concept overcomes current limitations
    of metallaphotocatalysis by unlocking the potential of dyes that were previously
    unsuitable.
article_processing_charge: No
article_type: original
author:
- first_name: Susanne
  full_name: Reischauer, Susanne
  last_name: Reischauer
- first_name: Volker
  full_name: Strauss, Volker
  last_name: Strauss
- first_name: Bartholomäus
  full_name: Pieber, Bartholomäus
  id: 93e5e5b2-0da6-11ed-8a41-af589a024726
  last_name: Pieber
  orcid: 0000-0001-8689-388X
citation:
  ama: Reischauer S, Strauss V, Pieber B. Modular, self-assembling metallaphotocatalyst
    for cross-couplings using the full visible-light spectrum. <i>ACS Catalysis</i>.
    2020;10(22):13269–13274. doi:<a href="https://doi.org/10.1021/acscatal.0c03950">10.1021/acscatal.0c03950</a>
  apa: Reischauer, S., Strauss, V., &#38; Pieber, B. (2020). Modular, self-assembling
    metallaphotocatalyst for cross-couplings using the full visible-light spectrum.
    <i>ACS Catalysis</i>. American Chemical Society. <a href="https://doi.org/10.1021/acscatal.0c03950">https://doi.org/10.1021/acscatal.0c03950</a>
  chicago: Reischauer, Susanne, Volker Strauss, and Bartholomäus Pieber. “Modular,
    Self-Assembling Metallaphotocatalyst for Cross-Couplings Using the Full Visible-Light
    Spectrum.” <i>ACS Catalysis</i>. American Chemical Society, 2020. <a href="https://doi.org/10.1021/acscatal.0c03950">https://doi.org/10.1021/acscatal.0c03950</a>.
  ieee: S. Reischauer, V. Strauss, and B. Pieber, “Modular, self-assembling metallaphotocatalyst
    for cross-couplings using the full visible-light spectrum,” <i>ACS Catalysis</i>,
    vol. 10, no. 22. American Chemical Society, pp. 13269–13274, 2020.
  ista: Reischauer S, Strauss V, Pieber B. 2020. Modular, self-assembling metallaphotocatalyst
    for cross-couplings using the full visible-light spectrum. ACS Catalysis. 10(22),
    13269–13274.
  mla: Reischauer, Susanne, et al. “Modular, Self-Assembling Metallaphotocatalyst
    for Cross-Couplings Using the Full Visible-Light Spectrum.” <i>ACS Catalysis</i>,
    vol. 10, no. 22, American Chemical Society, 2020, pp. 13269–13274, doi:<a href="https://doi.org/10.1021/acscatal.0c03950">10.1021/acscatal.0c03950</a>.
  short: S. Reischauer, V. Strauss, B. Pieber, ACS Catalysis 10 (2020) 13269–13274.
date_created: 2022-08-24T10:40:46Z
date_published: 2020-11-02T00:00:00Z
date_updated: 2023-02-21T10:09:09Z
day: '02'
doi: 10.1021/acscatal.0c03950
extern: '1'
intvolume: '        10'
issue: '22'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.26434/chemrxiv.12444908
month: '11'
oa: 1
oa_version: Preprint
page: 13269–13274
publication: ACS Catalysis
publication_identifier:
  eissn:
  - 2155-5435
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Modular, self-assembling metallaphotocatalyst for cross-couplings using the
  full visible-light spectrum
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 10
year: '2020'
...
---
_id: '11966'
abstract:
- lang: eng
  text: The front cover artwork is provided by the group of Dr. Bartholomäus Pieber
    at the Max Planck Institute of Colloids and Interfaces (Germany). The image symbolizes
    the activation of a heterogeneous photocatalyst by visible light and its application
    for organic synthesis. Read the full text of the Review at 10.1002/cptc.202000014.
article_processing_charge: No
article_type: original
author:
- first_name: Sebastian
  full_name: Gisbertz, Sebastian
  last_name: Gisbertz
- first_name: Bartholomäus
  full_name: Pieber, Bartholomäus
  id: 93e5e5b2-0da6-11ed-8a41-af589a024726
  last_name: Pieber
  orcid: 0000-0001-8689-388X
citation:
  ama: Gisbertz S, Pieber B. Heterogeneous photocatalysis in organic synthesis. <i>ChemPhotoChem</i>.
    2020;4(7):454-454. doi:<a href="https://doi.org/10.1002/cptc.202000137">10.1002/cptc.202000137</a>
  apa: Gisbertz, S., &#38; Pieber, B. (2020). Heterogeneous photocatalysis in organic
    synthesis. <i>ChemPhotoChem</i>. Wiley. <a href="https://doi.org/10.1002/cptc.202000137">https://doi.org/10.1002/cptc.202000137</a>
  chicago: Gisbertz, Sebastian, and Bartholomäus Pieber. “Heterogeneous Photocatalysis
    in Organic Synthesis.” <i>ChemPhotoChem</i>. Wiley, 2020. <a href="https://doi.org/10.1002/cptc.202000137">https://doi.org/10.1002/cptc.202000137</a>.
  ieee: S. Gisbertz and B. Pieber, “Heterogeneous photocatalysis in organic synthesis,”
    <i>ChemPhotoChem</i>, vol. 4, no. 7. Wiley, pp. 454–454, 2020.
  ista: Gisbertz S, Pieber B. 2020. Heterogeneous photocatalysis in organic synthesis.
    ChemPhotoChem. 4(7), 454–454.
  mla: Gisbertz, Sebastian, and Bartholomäus Pieber. “Heterogeneous Photocatalysis
    in Organic Synthesis.” <i>ChemPhotoChem</i>, vol. 4, no. 7, Wiley, 2020, pp. 454–454,
    doi:<a href="https://doi.org/10.1002/cptc.202000137">10.1002/cptc.202000137</a>.
  short: S. Gisbertz, B. Pieber, ChemPhotoChem 4 (2020) 454–454.
date_created: 2022-08-25T08:33:38Z
date_published: 2020-07-01T00:00:00Z
date_updated: 2023-02-21T10:09:40Z
day: '01'
doi: 10.1002/cptc.202000137
extern: '1'
intvolume: '         4'
issue: '7'
language:
- iso: eng
month: '07'
oa_version: None
page: 454-454
publication: ChemPhotoChem
publication_identifier:
  eissn:
  - 2367-0932
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Heterogeneous photocatalysis in organic synthesis
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 4
year: '2020'
...
---
_id: '11969'
abstract:
- lang: eng
  text: Photochemistry enables new synthetic means to form carbon–heteroatom bonds.
    Photocatalysts can catalyze carbon–heteroatom cross-couplings by electron or energy
    transfer either alone or in combination with a second catalyst. Photocatalyst-free
    methods are possible using photolabile substrates or by generating photoactive
    electron donor-acceptor complexes. This review summarizes and discusses the strategies
    used in light-mediated carbon–heteroatom bond formations based on the proposed
    mechanisms.
article_processing_charge: No
article_type: review
author:
- first_name: Cristian
  full_name: Cavedon, Cristian
  last_name: Cavedon
- first_name: Peter H.
  full_name: Seeberger, Peter H.
  last_name: Seeberger
- first_name: Bartholomäus
  full_name: Pieber, Bartholomäus
  id: 93e5e5b2-0da6-11ed-8a41-af589a024726
  last_name: Pieber
  orcid: 0000-0001-8689-388X
citation:
  ama: Cavedon C, Seeberger PH, Pieber B. Photochemical strategies for carbon–heteroatom
    bond formation. <i>European Journal of Organic Chemistry</i>. 2020;2020(10):1379-1392.
    doi:<a href="https://doi.org/10.1002/ejoc.201901173">10.1002/ejoc.201901173</a>
  apa: Cavedon, C., Seeberger, P. H., &#38; Pieber, B. (2020). Photochemical strategies
    for carbon–heteroatom bond formation. <i>European Journal of Organic Chemistry</i>.
    Wiley. <a href="https://doi.org/10.1002/ejoc.201901173">https://doi.org/10.1002/ejoc.201901173</a>
  chicago: Cavedon, Cristian, Peter H. Seeberger, and Bartholomäus Pieber. “Photochemical
    Strategies for Carbon–Heteroatom Bond Formation.” <i>European Journal of Organic
    Chemistry</i>. Wiley, 2020. <a href="https://doi.org/10.1002/ejoc.201901173">https://doi.org/10.1002/ejoc.201901173</a>.
  ieee: C. Cavedon, P. H. Seeberger, and B. Pieber, “Photochemical strategies for
    carbon–heteroatom bond formation,” <i>European Journal of Organic Chemistry</i>,
    vol. 2020, no. 10. Wiley, pp. 1379–1392, 2020.
  ista: Cavedon C, Seeberger PH, Pieber B. 2020. Photochemical strategies for carbon–heteroatom
    bond formation. European Journal of Organic Chemistry. 2020(10), 1379–1392.
  mla: Cavedon, Cristian, et al. “Photochemical Strategies for Carbon–Heteroatom Bond
    Formation.” <i>European Journal of Organic Chemistry</i>, vol. 2020, no. 10, Wiley,
    2020, pp. 1379–92, doi:<a href="https://doi.org/10.1002/ejoc.201901173">10.1002/ejoc.201901173</a>.
  short: C. Cavedon, P.H. Seeberger, B. Pieber, European Journal of Organic Chemistry
    2020 (2020) 1379–1392.
date_created: 2022-08-25T08:49:25Z
date_published: 2020-03-15T00:00:00Z
date_updated: 2023-02-21T10:09:47Z
day: '15'
doi: 10.1002/ejoc.201901173
extern: '1'
intvolume: '      2020'
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1002/ejoc.201901173
month: '03'
oa: 1
oa_version: Published Version
page: 1379-1392
publication: European Journal of Organic Chemistry
publication_identifier:
  eissn:
  - 1099-0690
  issn:
  - 1434-193X
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Photochemical strategies for carbon–heteroatom bond formation
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 2020
year: '2020'
...
---
_id: '11978'
abstract:
- lang: eng
  text: Dual photocatalysis and nickel catalysis can effect cross-coupling under mild
    conditions, but little is known about the in situ kinetics of this class of reactions.
    We report a comprehensive kinetic examination of a model carboxylate O-arylation,
    comparing a state-of-the-art homogeneous photocatalyst (Ir(ppy)3) with a competitive
    heterogeneous photocatalyst (graphitic carbon nitride). Experimental conditions
    were adjusted such that the nickel catalytic cycle is saturated with excited photocatalyst.
    This approach was designed to remove the role of the photocatalyst, by which only
    the intrinsic behaviors of the nickel catalytic cycles are observed. The two reactions
    did not display identical kinetics. Ir(ppy)3 deactivates the nickel catalytic
    cycle and creates more dehalogenated side product. Kinetic data for the reaction
    using Ir(ppy)3 supports a turnover-limiting reductive elimination. Graphitic carbon
    nitride gave higher selectivity, even at high photocatalyst-to-nickel ratios.
    The heterogeneous reaction also showed a rate dependence on aryl halide, indicating
    that oxidative addition plays a role in rate determination. The results argue
    against the current mechanistic hypothesis, which states that the photocatalyst
    is only involved to trigger reductive elimination.
article_processing_charge: No
article_type: original
author:
- first_name: Jamal A.
  full_name: Malik, Jamal A.
  last_name: Malik
- first_name: Amiera
  full_name: Madani, Amiera
  last_name: Madani
- first_name: Bartholomäus
  full_name: Pieber, Bartholomäus
  id: 93e5e5b2-0da6-11ed-8a41-af589a024726
  last_name: Pieber
  orcid: 0000-0001-8689-388X
- first_name: Peter H.
  full_name: Seeberger, Peter H.
  last_name: Seeberger
citation:
  ama: Malik JA, Madani A, Pieber B, Seeberger PH. Evidence for photocatalyst involvement
    in oxidative additions of nickel-catalyzed carboxylate O-arylations. <i>Journal
    of the American Chemical Society</i>. 2020;142(25):11042-11049. doi:<a href="https://doi.org/10.1021/jacs.0c02848">10.1021/jacs.0c02848</a>
  apa: Malik, J. A., Madani, A., Pieber, B., &#38; Seeberger, P. H. (2020). Evidence
    for photocatalyst involvement in oxidative additions of nickel-catalyzed carboxylate
    O-arylations. <i>Journal of the American Chemical Society</i>. American Chemical
    Society. <a href="https://doi.org/10.1021/jacs.0c02848">https://doi.org/10.1021/jacs.0c02848</a>
  chicago: Malik, Jamal A., Amiera Madani, Bartholomäus Pieber, and Peter H. Seeberger.
    “Evidence for Photocatalyst Involvement in Oxidative Additions of Nickel-Catalyzed
    Carboxylate O-Arylations.” <i>Journal of the American Chemical Society</i>. American
    Chemical Society, 2020. <a href="https://doi.org/10.1021/jacs.0c02848">https://doi.org/10.1021/jacs.0c02848</a>.
  ieee: J. A. Malik, A. Madani, B. Pieber, and P. H. Seeberger, “Evidence for photocatalyst
    involvement in oxidative additions of nickel-catalyzed carboxylate O-arylations,”
    <i>Journal of the American Chemical Society</i>, vol. 142, no. 25. American Chemical
    Society, pp. 11042–11049, 2020.
  ista: Malik JA, Madani A, Pieber B, Seeberger PH. 2020. Evidence for photocatalyst
    involvement in oxidative additions of nickel-catalyzed carboxylate O-arylations.
    Journal of the American Chemical Society. 142(25), 11042–11049.
  mla: Malik, Jamal A., et al. “Evidence for Photocatalyst Involvement in Oxidative
    Additions of Nickel-Catalyzed Carboxylate O-Arylations.” <i>Journal of the American
    Chemical Society</i>, vol. 142, no. 25, American Chemical Society, 2020, pp. 11042–49,
    doi:<a href="https://doi.org/10.1021/jacs.0c02848">10.1021/jacs.0c02848</a>.
  short: J.A. Malik, A. Madani, B. Pieber, P.H. Seeberger, Journal of the American
    Chemical Society 142 (2020) 11042–11049.
date_created: 2022-08-25T10:57:38Z
date_published: 2020-06-24T00:00:00Z
date_updated: 2023-02-21T10:10:06Z
day: '24'
doi: 10.1021/jacs.0c02848
extern: '1'
external_id:
  pmid:
  - '32469219'
intvolume: '       142'
issue: '25'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1021/jacs.0c02848
month: '06'
oa: 1
oa_version: Published Version
page: 11042-11049
pmid: 1
publication: Journal of the American Chemical Society
publication_identifier:
  eissn:
  - 1520-5126
  issn:
  - 0002-7863
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Evidence for photocatalyst involvement in oxidative additions of nickel-catalyzed
  carboxylate O-arylations
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 142
year: '2020'
...
---
_id: '11979'
abstract:
- lang: eng
  text: Dual photoredox/nickel-catalysed C–N cross-couplings suffer from low yields
    for electron-rich aryl halides. The formation of catalytically inactive nickel-black
    is responsible for this limitation and causes severe reproducibility issues. Here,
    we demonstrate that catalyst deactivation can be avoided by using a carbon nitride
    photocatalyst. The broad absorption of the heterogeneous photocatalyst enables
    wavelength-dependent control of the rate of reductive elimination to prevent nickel-black
    formation during the coupling of cyclic, secondary amines and aryl halides. A
    second approach, which is applicable to a broader set of electron-rich aryl halides,
    is to run the reactions at high concentrations to increase the rate of oxidative
    addition. Less nucleophilic, primary amines can be coupled with electron-rich
    aryl halides by stabilizing low-valent nickel intermediates with a suitable additive.
    The developed protocols enable reproducible, selective C–N cross-couplings of
    electron-rich aryl bromides and can also be applied for electron-poor aryl chlorides.
article_processing_charge: No
article_type: original
author:
- first_name: Sebastian
  full_name: Gisbertz, Sebastian
  last_name: Gisbertz
- first_name: Susanne
  full_name: Reischauer, Susanne
  last_name: Reischauer
- first_name: Bartholomäus
  full_name: Pieber, Bartholomäus
  id: 93e5e5b2-0da6-11ed-8a41-af589a024726
  last_name: Pieber
  orcid: 0000-0001-8689-388X
citation:
  ama: Gisbertz S, Reischauer S, Pieber B. Overcoming limitations in dual photoredox/nickel-catalysed
    C–N cross-couplings due to catalyst deactivation. <i>Nature Catalysis</i>. 2020;3(8):611-620.
    doi:<a href="https://doi.org/10.1038/s41929-020-0473-6">10.1038/s41929-020-0473-6</a>
  apa: Gisbertz, S., Reischauer, S., &#38; Pieber, B. (2020). Overcoming limitations
    in dual photoredox/nickel-catalysed C–N cross-couplings due to catalyst deactivation.
    <i>Nature Catalysis</i>. Springer Nature. <a href="https://doi.org/10.1038/s41929-020-0473-6">https://doi.org/10.1038/s41929-020-0473-6</a>
  chicago: Gisbertz, Sebastian, Susanne Reischauer, and Bartholomäus Pieber. “Overcoming
    Limitations in Dual Photoredox/Nickel-Catalysed C–N Cross-Couplings Due to Catalyst
    Deactivation.” <i>Nature Catalysis</i>. Springer Nature, 2020. <a href="https://doi.org/10.1038/s41929-020-0473-6">https://doi.org/10.1038/s41929-020-0473-6</a>.
  ieee: S. Gisbertz, S. Reischauer, and B. Pieber, “Overcoming limitations in dual
    photoredox/nickel-catalysed C–N cross-couplings due to catalyst deactivation,”
    <i>Nature Catalysis</i>, vol. 3, no. 8. Springer Nature, pp. 611–620, 2020.
  ista: Gisbertz S, Reischauer S, Pieber B. 2020. Overcoming limitations in dual photoredox/nickel-catalysed
    C–N cross-couplings due to catalyst deactivation. Nature Catalysis. 3(8), 611–620.
  mla: Gisbertz, Sebastian, et al. “Overcoming Limitations in Dual Photoredox/Nickel-Catalysed
    C–N Cross-Couplings Due to Catalyst Deactivation.” <i>Nature Catalysis</i>, vol.
    3, no. 8, Springer Nature, 2020, pp. 611–20, doi:<a href="https://doi.org/10.1038/s41929-020-0473-6">10.1038/s41929-020-0473-6</a>.
  short: S. Gisbertz, S. Reischauer, B. Pieber, Nature Catalysis 3 (2020) 611–620.
date_created: 2022-08-25T11:06:16Z
date_published: 2020-08-01T00:00:00Z
date_updated: 2023-02-21T10:10:09Z
day: '01'
doi: 10.1038/s41929-020-0473-6
extern: '1'
intvolume: '         3'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.26434/chemrxiv.10298735
month: '08'
oa: 1
oa_version: Preprint
page: 611-620
publication: Nature Catalysis
publication_identifier:
  eissn:
  - 2520-1158
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Overcoming limitations in dual photoredox/nickel-catalysed C–N cross-couplings
  due to catalyst deactivation
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 3
year: '2020'
...
---
_id: '11980'
abstract:
- lang: eng
  text: Small organic radicals are ubiquitous intermediates in photocatalysis and
    are used in organic synthesis to install functional groups and to tune electronic
    properties and pharmacokinetic parameters of the final molecule. Development of
    new methods to generate small organic radicals with added functionality can further
    extend the utility of photocatalysis for synthetic needs. Herein, we present a
    method to generate dichloromethyl radicals from chloroform using a heterogeneous
    potassium poly(heptazine imide) (K-PHI) photocatalyst under visible light irradiation
    for C1-extension of the enone backbone. The method is applied on 15 enones, with
    γ,γ-dichloroketones yields of 18–89%. Due to negative zeta-potential (−40 mV)
    and small particle size (100 nm) K-PHI suspension is used in quasi-homogeneous
    flow-photoreactor increasing the productivity by 19 times compared to the batch
    approach. The resulting γ,γ-dichloroketones, are used as bifunctional building
    blocks to access value-added organic compounds such as substituted furans and
    pyrroles.
article_number: '1387'
article_processing_charge: No
article_type: original
author:
- first_name: Stefano
  full_name: Mazzanti, Stefano
  last_name: Mazzanti
- first_name: Bogdan
  full_name: Kurpil, Bogdan
  last_name: Kurpil
- first_name: Bartholomäus
  full_name: Pieber, Bartholomäus
  id: 93e5e5b2-0da6-11ed-8a41-af589a024726
  last_name: Pieber
  orcid: 0000-0001-8689-388X
- first_name: Markus
  full_name: Antonietti, Markus
  last_name: Antonietti
- first_name: Aleksandr
  full_name: Savateev, Aleksandr
  last_name: Savateev
citation:
  ama: Mazzanti S, Kurpil B, Pieber B, Antonietti M, Savateev A. Dichloromethylation
    of enones by carbon nitride photocatalysis. <i>Nature Communications</i>. 2020;11.
    doi:<a href="https://doi.org/10.1038/s41467-020-15131-0">10.1038/s41467-020-15131-0</a>
  apa: Mazzanti, S., Kurpil, B., Pieber, B., Antonietti, M., &#38; Savateev, A. (2020).
    Dichloromethylation of enones by carbon nitride photocatalysis. <i>Nature Communications</i>.
    Springer Nature. <a href="https://doi.org/10.1038/s41467-020-15131-0">https://doi.org/10.1038/s41467-020-15131-0</a>
  chicago: Mazzanti, Stefano, Bogdan Kurpil, Bartholomäus Pieber, Markus Antonietti,
    and Aleksandr Savateev. “Dichloromethylation of Enones by Carbon Nitride Photocatalysis.”
    <i>Nature Communications</i>. Springer Nature, 2020. <a href="https://doi.org/10.1038/s41467-020-15131-0">https://doi.org/10.1038/s41467-020-15131-0</a>.
  ieee: S. Mazzanti, B. Kurpil, B. Pieber, M. Antonietti, and A. Savateev, “Dichloromethylation
    of enones by carbon nitride photocatalysis,” <i>Nature Communications</i>, vol.
    11. Springer Nature, 2020.
  ista: Mazzanti S, Kurpil B, Pieber B, Antonietti M, Savateev A. 2020. Dichloromethylation
    of enones by carbon nitride photocatalysis. Nature Communications. 11, 1387.
  mla: Mazzanti, Stefano, et al. “Dichloromethylation of Enones by Carbon Nitride
    Photocatalysis.” <i>Nature Communications</i>, vol. 11, 1387, Springer Nature,
    2020, doi:<a href="https://doi.org/10.1038/s41467-020-15131-0">10.1038/s41467-020-15131-0</a>.
  short: S. Mazzanti, B. Kurpil, B. Pieber, M. Antonietti, A. Savateev, Nature Communications
    11 (2020).
date_created: 2022-08-25T11:10:15Z
date_published: 2020-03-13T00:00:00Z
date_updated: 2023-02-21T10:10:14Z
day: '13'
doi: 10.1038/s41467-020-15131-0
extern: '1'
intvolume: '        11'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1038/s41467-020-15131-0
month: '03'
oa: 1
oa_version: Published Version
publication: Nature Communications
publication_identifier:
  eissn:
  - 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Dichloromethylation of enones by carbon nitride photocatalysis
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 11
year: '2020'
...
---
_id: '11986'
abstract:
- lang: eng
  text: Carbon nitride materials have emerged as an efficient and sustainable class
    of heterogeneous photocatalysts, particularly when paired with nickel in dual
    catalytic cross-coupling reactions. Performing these transformations on larger
    scales using a continuous process is difficult due to the problems associated
    with handling solids in flow. By combining an oscillatory pump with a microstructured
    plug flow photoreactor, a stable suspension of the photocatalyst can be maintained,
    circumventing clogging of the reactor channels. Through careful tuning of the
    oscillator properties, the residence time distribution (RTD) was optimized, whilst
    maintaining a stable catalyst suspension. Short residence times (20 min) were
    achieved using optimized conditions and the recyclability of the photocatalyst
    was demonstrated over 10 cycles with no loss of activity. During a stable 4.5
    hour scale-out demonstration, the model substrate could be isolated on 12 g scale
    (90% yield, 2.67 g h−1). Moreover, the method was applied for the gram scale synthesis
    of an intermediate of the active pharmaceutical ingredient tetracaine.
article_processing_charge: No
article_type: original
author:
- first_name: Cristian
  full_name: Rosso, Cristian
  last_name: Rosso
- first_name: Sebastian
  full_name: Gisbertz, Sebastian
  last_name: Gisbertz
- first_name: Jason D.
  full_name: Williams, Jason D.
  last_name: Williams
- first_name: Hannes P. L.
  full_name: Gemoets, Hannes P. L.
  last_name: Gemoets
- first_name: Wouter
  full_name: Debrouwer, Wouter
  last_name: Debrouwer
- first_name: Bartholomäus
  full_name: Pieber, Bartholomäus
  id: 93e5e5b2-0da6-11ed-8a41-af589a024726
  last_name: Pieber
  orcid: 0000-0001-8689-388X
- first_name: C. Oliver
  full_name: Kappe, C. Oliver
  last_name: Kappe
citation:
  ama: Rosso C, Gisbertz S, Williams JD, et al. An oscillatory plug flow photoreactor
    facilitates semi-heterogeneous dual nickel/carbon nitride photocatalytic C–N couplings.
    <i>Reaction Chemistry and Engineering</i>. 2020;5(3):597-604. doi:<a href="https://doi.org/10.1039/d0re00036a">10.1039/d0re00036a</a>
  apa: Rosso, C., Gisbertz, S., Williams, J. D., Gemoets, H. P. L., Debrouwer, W.,
    Pieber, B., &#38; Kappe, C. O. (2020). An oscillatory plug flow photoreactor facilitates
    semi-heterogeneous dual nickel/carbon nitride photocatalytic C–N couplings. <i>Reaction
    Chemistry and Engineering</i>. Royal Society of Chemistry. <a href="https://doi.org/10.1039/d0re00036a">https://doi.org/10.1039/d0re00036a</a>
  chicago: Rosso, Cristian, Sebastian Gisbertz, Jason D. Williams, Hannes P. L. Gemoets,
    Wouter Debrouwer, Bartholomäus Pieber, and C. Oliver Kappe. “An Oscillatory Plug
    Flow Photoreactor Facilitates Semi-Heterogeneous Dual Nickel/Carbon Nitride Photocatalytic
    C–N Couplings.” <i>Reaction Chemistry and Engineering</i>. Royal Society of Chemistry,
    2020. <a href="https://doi.org/10.1039/d0re00036a">https://doi.org/10.1039/d0re00036a</a>.
  ieee: C. Rosso <i>et al.</i>, “An oscillatory plug flow photoreactor facilitates
    semi-heterogeneous dual nickel/carbon nitride photocatalytic C–N couplings,” <i>Reaction
    Chemistry and Engineering</i>, vol. 5, no. 3. Royal Society of Chemistry, pp.
    597–604, 2020.
  ista: Rosso C, Gisbertz S, Williams JD, Gemoets HPL, Debrouwer W, Pieber B, Kappe
    CO. 2020. An oscillatory plug flow photoreactor facilitates semi-heterogeneous
    dual nickel/carbon nitride photocatalytic C–N couplings. Reaction Chemistry and
    Engineering. 5(3), 597–604.
  mla: Rosso, Cristian, et al. “An Oscillatory Plug Flow Photoreactor Facilitates
    Semi-Heterogeneous Dual Nickel/Carbon Nitride Photocatalytic C–N Couplings.” <i>Reaction
    Chemistry and Engineering</i>, vol. 5, no. 3, Royal Society of Chemistry, 2020,
    pp. 597–604, doi:<a href="https://doi.org/10.1039/d0re00036a">10.1039/d0re00036a</a>.
  short: C. Rosso, S. Gisbertz, J.D. Williams, H.P.L. Gemoets, W. Debrouwer, B. Pieber,
    C.O. Kappe, Reaction Chemistry and Engineering 5 (2020) 597–604.
date_created: 2022-08-25T11:45:02Z
date_published: 2020-03-01T00:00:00Z
date_updated: 2023-02-21T10:10:28Z
day: '01'
doi: 10.1039/d0re00036a
extern: '1'
intvolume: '         5'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1039/D0RE00036A
month: '03'
oa: 1
oa_version: Published Version
page: 597-604
publication: Reaction Chemistry and Engineering
publication_identifier:
  eissn:
  - 2058-9883
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: An oscillatory plug flow photoreactor facilitates semi-heterogeneous dual nickel/carbon
  nitride photocatalytic C–N couplings
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2020'
...