1
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Wang C, Zhang S, Yuan T, Jimoh AA, Abreu M, Shan C, Wojtas L, Xing Y, Hong X, Shi X. Triazole-modified Ru-carbene complexes: A valid olefin metathesis pre-catalyst for dynamic covalent chemistry via C=C bond formation. CHEM CATALYSIS 2023; 3:100678. [PMID: 37873035 PMCID: PMC10588561 DOI: 10.1016/j.checat.2023.100678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
The 1,2,3-triazole coordinated ruthenium carbene complexes (TA-Ru) were reported for the first time as a new class of modified Grubbs catalyst to achieve challenging olefin metathesis at higher temperatures without catalyst decomposition. Previously reported N-tethered Ru-carbene complexes all suffered from rapid cis/trans isomerization, causing significantly reduced catalyst reactivity. These new TA-Ru complexes hold the active trans-dichloro conformation even at 80 °C, allowing effective olefin metathesis for challenging substrates. With this new TA-Ru catalyst, cross-metathesis (CM), ring-closing metathesis (RCM) and dynamic covalent chemistry (DCvC) were achieved. Excitingly, the reactivity of TA-Ru prevails all previously reported N-coordinated Ru-carbene precatalysts, Grubbs II, and Hoveyda-Grubbs, making the TA-Ru a transformative catalytic system in olefin catalysis.
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Affiliation(s)
- Chenhuan Wang
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | - Shuyao Zhang
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | - Teng Yuan
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | - Abiola Azee Jimoh
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | - Maxwell Abreu
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | - Chuan Shan
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | - Lukasz Wojtas
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | | | - Xin Hong
- Department of Chemistry, Zhejiang University, China
| | - Xiaodong Shi
- Department of Chemistry, University of South Florida, Tampa, FL, USA
- Lead contact
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2
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Martínez JP, Trzaskowski B. Electrophilicity of Hoveyda-Grubbs Olefin Metathesis Catalysts as the Driving Force that Controls Initiation Rates. Chemphyschem 2022; 23:e202200580. [PMID: 36062870 DOI: 10.1002/cphc.202200580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/01/2022] [Indexed: 01/05/2023]
Abstract
The dissociative mechanism of initiation for a series of Hoveyda-Grubbs type metathesis catalysts modified at the para and meta positions in the isopropoxybenzylidene ligand is investigated by means of DFT calculations. The electron donating/withdrawing capacity of the ligand was screened through the incorporation of various substituents such as halogens, nitro, alkoxides, ketones, esters, amines, and amides. Variations in structural parameters, energy barriers for the Ru-O bond dissociation, and Ru-O bond strength were examined as a function of the Hammett constant. It was found that electronic properties of the catalysts such as chemical potential, hardness, and electrophilicity correlate linearly with the dissociative energy barriers. These findings enable a systematic rationalization and prediction of rate of precatalyst initiation through the calculation of only the HOMO-LUMO gap of catalysts, as the faster the initiation, the more electrophilic the catalyst.
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3
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Saha S, Averkiev B, Sues PE. Ruthenium Phosphinimine Complex as a Fast-Initiating Olefin Metathesis Catalyst with Competing Catalytic Cycles. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sayantani Saha
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66503, United States
| | - Boris Averkiev
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66503, United States
| | - Peter E. Sues
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66503, United States
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4
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Cater HL, Balynska I, Allen MJ, Freeman BD, Page ZA. User Guide to Ring-Opening Metathesis Polymerization of endo-Norbornene Monomers with Chelated Initiators. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Henry L. Cater
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Iana Balynska
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Marshall J. Allen
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Benny D. Freeman
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Zachariah A. Page
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
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5
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Si G, Tan C, Chen M, Chen C. A Cocatalyst Strategy to Enhance Ruthenium‐Mediated Metathesis Reactivity towards Electron‐Deficient Substrates. Angew Chem Int Ed Engl 2022; 61:e202203796. [DOI: 10.1002/anie.202203796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Guifu Si
- CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 China
| | - Chen Tan
- Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University Hefei Anhui 230601 China
| | - Min Chen
- Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University Hefei Anhui 230601 China
| | - Changle Chen
- CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 China
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6
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Si G, Tan C, Chen M, Chen C. A Cocatalyst Strategy to Enhance Ruthenium‐Mediated Metathesis Reactivity towards Electron‐Deficient Substrates. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Guifu Si
- University of Science and Technology of China Chemistry CHINA
| | - Chen Tan
- Anhui University Institutes of Physical Science and Information Technology CHINA
| | - Min Chen
- Anhui University Institutes of Physical Science and Information Technology CHINA
| | - Changle Chen
- University of Science and Technology of China Department of Polymer Science & Engineering Jinzhai Rd 96 230026 Hefei CHINA
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7
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Martínez JP, Trzaskowski B. Olefin Metathesis Catalyzed by a Hoveyda-Grubbs-like Complex Chelated to Bis(2-mercaptoimidazolyl) Methane: A Predictive DFT Study. J Phys Chem A 2022; 126:720-732. [PMID: 35080885 PMCID: PMC8842278 DOI: 10.1021/acs.jpca.1c09336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Although highly selective
complexes for the cross-metathesis of
olefins, particularly oriented toward the productive metathesis of Z-olefins, have been reported in recent years, there is
a constant need to design and prepare new and improved catalysts for
this challenging reaction. In this work, guided by density functional
theory (DFT) calculations, the performance of a Ru-based catalyst
chelated to a sulfurated pincer in the olefin metathesis was computationally
assessed. The catalyst was designed based on the Hoveyda–Grubbs
catalyst (SIMes)Cl2Ru(=CH–o–OiPrC6H4) through the substitution
of chlorides with the chelator bis(2-mercaptoimidazolyl)methane. The
obtained thermodynamic and kinetic data of the initiation phase through
side- and bottom-bound mechanisms suggest that this system is a versatile
catalyst for olefin metathesis, as DFT predicts the highest energy
barrier of the catalytic cycle of ca. 20 kcal/mol, which is comparable
to those corresponding to the Hoveyda–Grubbs-type catalysts.
Moreover, in terms of the stereoselectivity evaluated through the
propagation phase in the metathesis of propene–propene to 2-butene,
our study reveals that the Z isomer can be formed
under a kinetic control. We believe that this is an interesting outcome
in the context of future exploration of Ru-based catalysts with sulfurated
chelates in the search for high stereoselectivity in selected reactions.
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Affiliation(s)
- J Pablo Martínez
- Centre of New Technologies, University of Warsaw, 02-097 Warszawa, Poland
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8
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Al-Enezi MY, John E, Ibrahim YA, Al-Awadi NA. Highly efficient Ru( ii)–alkylidene based Hoveyda–Grubbs catalysts for ring-closing metathesis reactions. RSC Adv 2021; 11:37866-37876. [PMID: 35498076 PMCID: PMC9044017 DOI: 10.1039/d1ra07428h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/10/2021] [Indexed: 11/21/2022] Open
Abstract
Three novel phosphine-free Ru-alkylidenes (7a–7c) have been synthesized and utilized as efficient catalysts for ring closing metathesis (RCM) reaction. Spectroscopic data, i.e. NMR and HRMS, along with single crystal X-ray diffraction analysis, were used to confirm their chemical structures. The tosylated carbenoid 7b showed the highest efficiency in cyclizing different acyclic diene substrates. RCM of various (un)substituted N,N-diallylaniline derivatives and stereoselective RCM of different macromolecular dienes were well tolerated using only a catalytic amount (0.5–2.0 mol%) of the additive catalyst (7b) as compared to the well-known Grubbs (II) and Hoveyda–Grubbs (II) catalysts. Three novel phosphine-free Ru-alkylidenes (7a–7c) have been synthesized and utilized as efficient catalysts for ring closing metathesis (RCM) reaction.![]()
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Affiliation(s)
- Mariam Y. Al-Enezi
- Department of Chemistry, Kuwait University, P. O. Box 5969, Safat, 13060, Kuwait
| | - Elizabeth John
- Department of Chemistry, Kuwait University, P. O. Box 5969, Safat, 13060, Kuwait
| | - Yehia A. Ibrahim
- Department of Chemistry, Kuwait University, P. O. Box 5969, Safat, 13060, Kuwait
| | - Nouria A. Al-Awadi
- Department of Chemistry, Kuwait University, P. O. Box 5969, Safat, 13060, Kuwait
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9
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Asaithambi R, Palanivel C. In vitro and molecular docking analysis of chalconeimine derivatives with α-glucosidase. Bioinformation 2020; 16:949-957. [PMID: 34803272 PMCID: PMC8573464 DOI: 10.6026/97320630016949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/25/2020] [Accepted: 10/25/2020] [Indexed: 12/16/2022] Open
Abstract
It is known that α-glucosidase is linked with the antioxidant activity. Therefore, it is of interest to document the in- vitro and molecular docking analysis of chalconeimine derivatives with α-glucosidase (PDB ID: 2ZEO) for further consideration.
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Affiliation(s)
- R Asaithambi
- PG and Research Dept. of Chemistry, Government Arts College, C. Mutlur, Chidambaram - 608102, Tamilnadu, India
| | - C Palanivel
- PG and Research Dept. of Chemistry, Government Arts College, C. Mutlur, Chidambaram - 608102, Tamilnadu, India
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10
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Poater A, D'Alterio MC, Talarico G, Chauvin R. Arene vs. Alkene Substrates in Ru-Catalyzed Olefin Metathesis: a DFT Investigation. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000725] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química; Universitat de Girona; 17003 Girona Catalonia Spain
| | - Massimo Christian D'Alterio
- Institut de Química Computacional i Catàlisi and Departament de Química; Universitat de Girona; 17003 Girona Catalonia Spain
- Dipartimento di Scienze Chimiche; Università di Napoli Federico II; Via Cintia 80126 Napoli Italy
| | - Giovanni Talarico
- Dipartimento di Scienze Chimiche; Università di Napoli Federico II; Via Cintia 80126 Napoli Italy
| | - Remi Chauvin
- UPS, ICT-FR 2599; Université de Toulouse; 118 route de Narbonne 31062 Toulouse Cedex 9 France
- LCC (Laboratoire de Chimie de Coordination); CNRS; 205 route de Narbonne, BP 44099 31077 Toulouse Cedex 4 France
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11
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Abstract
A kinetic study concerning the self-metathesis of methyl oleate and methyl elaidate was performed, using a variety of NHC-ruthenium pre-catalysts, bearing either mesityl groups or di-isopropyl-phenyl groups on the NHC ligand and various trans ligands with respect to the NHC unit. We showed that the system can be satisfactorily described using one initiation constant per pre-catalyst and four propagation constants that, conversely, do not depend on the pre-catalyst. The difference of reactivity with oleate (Z) and elaidate (E) can be fully explained by the propagation parameters; the studied pre-catalysts initiate with the same rate starting from the Z or the E olefin. The ranking of the propagation parameters is driven by the thermodynamic equilibrium. The transformation rates of Z and E isomers is only driven by these propagation constants and nothing differentiates the initiation step.
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12
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Samkian AE, Xu Y, Virgil SC, Yoon KY, Grubbs RH. Synthesis and Activity of Six-Membered Cyclic Alkyl Amino Carbene–Ruthenium Olefin Metathesis Catalysts. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00862] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Adrian E. Samkian
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Yan Xu
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Scott C. Virgil
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Ki-Young Yoon
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Robert H. Grubbs
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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13
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Jawiczuk M, Młodzikowska-Pieńko K, Osella S, Trzaskowski B. Molecular Modeling of Mechanisms of Decomposition of Ruthenium Metathesis Catalysts by Acrylonitrile. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00372] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Magdalena Jawiczuk
- Centre of New Technologies, University of Warsaw, 02-097 Warszawa, Poland
| | - Katarzyna Młodzikowska-Pieńko
- Centre of New Technologies, University of Warsaw, 02-097 Warszawa, Poland
- Faculty of Chemistry, University of Warsaw, 02-093 Warszawa, Poland
| | - Silvio Osella
- Centre of New Technologies, University of Warsaw, 02-097 Warszawa, Poland
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14
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Jatmika C, Goshima K, Wakabayashi K, Akiyama N, Hirota S, Matsuo T. Second-coordination sphere effects on the reactivities of Hoveyda–Grubbs-type catalysts: a ligand exchange study using phenolic moiety-functionalized ligands. Dalton Trans 2020; 49:11618-11627. [DOI: 10.1039/d0dt02353a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivities of Hoveyda–Grubbs-type complexes are tunable through second-coordination sphere effects caused by a functional group in the ligand.
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Affiliation(s)
- Catur Jatmika
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Kenta Goshima
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Kazumo Wakabayashi
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Naoki Akiyama
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Shun Hirota
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Takashi Matsuo
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
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15
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Gimferrer M, Salvador P, Poater A. Computational Monitoring of Oxidation States in Olefin Metathesis. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00591] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martí Gimferrer
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, Campus Montilivi, 17003 Girona, Catalonia, Spain
| | - Pedro Salvador
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, Campus Montilivi, 17003 Girona, Catalonia, Spain
| | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, Campus Montilivi, 17003 Girona, Catalonia, Spain
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16
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2018. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.213051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Song K, Kim K, Hong D, Kim J, Heo CE, Kim HI, Hong SH. Highly active ruthenium metathesis catalysts enabling ring-opening metathesis polymerization of cyclopentadiene at low temperatures. Nat Commun 2019; 10:3860. [PMID: 31455772 PMCID: PMC6712042 DOI: 10.1038/s41467-019-11806-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 08/06/2019] [Indexed: 11/09/2022] Open
Abstract
Development of versatile ruthenium olefin-metathesis catalysts with high activity, stability, and selectivity is a continuous challenge. Here we report highly controllable ruthenium catalysts using readily accessible and versatile N-vinylsulfonamides as carbene precursors. Catalyst initiation rates were controlled in a straightforward manner, from latent to fast initiating, through the facile modulation of the N-vinylsulfonamide ligands. Trifluoromethanesulfonamide-based catalysts initiated ultrarapidly even at temperatures as low as -60 °C and continuously propagated rapidly, enabling the enthalpically and entropically less-favored ring-opening metathesis polymerizations of low-strained functionalized cyclopentene derivatives, some of which are not accessible with previous olefin-metathesis catalysts. To our surprise, the developed catalysts facilitated the polymerization of cyclopentadiene (CPD), a feedstock that is easily and commonly obtainable through the steam cracking of naphtha, which has, to the best of our knowledge, not been previously achieved due to its low ring strain and facile dimerization even at low temperatures (below 0 °C).
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Affiliation(s)
- Kitaek Song
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Kunsoon Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Daeun Hong
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jungwon Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Chae Eun Heo
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Hugh I Kim
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Soon Hyeok Hong
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, 08826, Republic of Korea.
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18
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Abstract
Ligands, especially phosphines and carbenes, can play a key role in modifying and controlling homogeneous organometallic catalysts, and they often provide a convenient approach to fine-tuning the performance of known catalysts. The measurable outcomes of such catalyst modifications (yields, rates, selectivity) can be set into context by establishing their relationship to steric and electronic descriptors of ligand properties, and such models can guide the discovery, optimization, and design of catalysts. In this review we present a survey of calculated ligand descriptors, with a particular focus on homogeneous organometallic catalysis. A range of different approaches to calculating steric and electronic parameters are set out and compared, and we have collected descriptors for a range of representative ligand sets, including 30 monodentate phosphorus(III) donor ligands, 23 bidentate P,P-donor ligands, and 30 carbenes, with a view to providing a useful resource for analysis to practitioners. In addition, several case studies of applications of such descriptors, covering both maps and models, have been reviewed, illustrating how descriptor-led studies of catalysis can inform experiments and highlighting good practice for model comparison and evaluation.
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Affiliation(s)
- Derek J Durand
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
| | - Natalie Fey
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K
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19
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Smoleń M, Marczyk A, Kośnik W, Trzaskowski B, Kajetanowicz A, Grela K. Ruthenium‐Catalysed Olefin Metathesis in Environmentally Friendly Solvents: 2‐Methyltetrahydrofuran Revisited. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801741] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Michał Smoleń
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Anna Marczyk
- Faculty of Chemistry Centre of New Technologies, University of Warsaw S. Banacha 2c 02‐097 Warszawa Poland
| | - Wioletta Kośnik
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Bartosz Trzaskowski
- Faculty of Chemistry Centre of New Technologies, University of Warsaw S. Banacha 2c 02‐097 Warszawa Poland
| | - Anna Kajetanowicz
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Karol Grela
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
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20
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Nikitin K, O'Gara R. Mechanisms and Beyond: Elucidation of Fluxional Dynamics by Exchange NMR Spectroscopy. Chemistry 2019; 25:4551-4589. [PMID: 30421834 DOI: 10.1002/chem.201804123] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Indexed: 12/31/2022]
Abstract
Detailed mechanistic information is crucial to our understanding of reaction pathways and selectivity. Dynamic exchange NMR techniques, in particular 2D exchange spectroscopy (EXSY) and its modifications, provide indispensable intricate information on the mechanisms of organic and inorganic reactions and other phenomena, for example, the dynamics of interfacial processes. In this Review, key results from exchange NMR studies of small molecules over the last few decades are systemised and discussed. After a brief introduction to the theory, the key types of dynamic processes are identified and fundamental examples given of intra- and intermolecular reactions, which, in turn, could involve, or not, bond-making and bond-breaking events. Following that logic, internal molecular rotation, intramolecular stereomutation and molecular recognition will first be considered because they do not typically involve bond breaking. Then, rearrangements, substitution-type reactions, cyclisations, additions and other processes affecting chemical bonds will be discussed. Finally, interfacial molecular dynamics and unexpected combinations of different types of fluxional processes will also be highlighted. How exchange NMR spectroscopy helps to identify conformational changes, coordination and molecular recognition processes as well as quantify reaction energy barriers and extract detailed mechanistic information by using reaction rate theory in conjunction with computational techniques will be shown.
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Affiliation(s)
- Kirill Nikitin
- School of Chemistry, University College Dublin, Belfield, Dublin, Ireland
| | - Ryan O'Gara
- School of Chemistry, University College Dublin, Belfield, Dublin, Ireland
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21
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Peschek N, Wannowius KJ, Plenio H. The Initiation Reaction of Hoveyda–Grubbs Complexes with Ethene. ACS Catal 2019. [DOI: 10.1021/acscatal.8b03445] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Natalie Peschek
- Organometallic Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, 64287 Darmstadt, Germany
| | - Klaus-Jürgen Wannowius
- Organometallic Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, 64287 Darmstadt, Germany
| | - Herbert Plenio
- Organometallic Chemistry, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, 64287 Darmstadt, Germany
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Jawiczuk M, Janaszkiewicz A, Trzaskowski B. The influence of the cationic carbenes on the initiation kinetics of ruthenium-based metathesis catalysts; a DFT study. Beilstein J Org Chem 2018; 14:2872-2880. [PMID: 30546471 PMCID: PMC6278762 DOI: 10.3762/bjoc.14.266] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 11/01/2018] [Indexed: 11/30/2022] Open
Abstract
Cationic carbenes are a relatively new and rare group of ancillary ligands, which have shown their superior activity in a number of challenging catalytic reactions. In ruthenium-based metathesis catalysis they are often used as ammonium tags, to provide water-soluble, environment-friendly catalysts. In this work we performed computational studies on three cationic carbenes with the formal positive charge located at different distances from the carbene carbon. We show that the predicted initiation rates of Grubbs, indenylidene, and Hoveyda–Grubbs-like complexes incorporating these carbenes show little variance and are similar to initiation rates of standard Grubbs, indenylidene, and Hoveyda–Grubbs catalysts. In all investigated cases the partial charge of the carbene carbon atom is similar, resulting in comparable Ccarbene–Ru bond strengths and Ru–P/O dissociation Gibbs free energies.
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Affiliation(s)
- Magdalena Jawiczuk
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warszawa, Poland
| | | | - Bartosz Trzaskowski
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warszawa, Poland
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Thomas AA, Speck K, Kevlishvili I, Lu Z, Liu P, Buchwald SL. Mechanistically Guided Design of Ligands That Significantly Improve the Efficiency of CuH-Catalyzed Hydroamination Reactions. J Am Chem Soc 2018; 140:13976-13984. [PMID: 30244567 PMCID: PMC6469493 DOI: 10.1021/jacs.8b09565] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Using a mechanically guided ligand design approach, a new ligand (SEGFAST) for the CuH-catalyzed hydroamination reaction of unactivated terminal olefins has been developed, providing a 62-fold rate increase over reactions compared to DTBM-SEGPHOS, the previous optimal ligand. Combining the respective strengths of computational chemistry and experimental kinetic measurements, we were able to quickly identify potential modifications that lead to more effective ligands, thus avoiding synthesizing and testing a large library of ligands. By optimizing the combination of attractive, noncovalent ligand-substrate interactions and the stability of the catalyst under the reaction conditions, we were able to identify a finely tuned hybrid ligand that greatly enables accelerated hydrocupration rates with unactivated alkenes. Moreover, a modular and robust synthetic sequence was devised, which allowed for the practical, gram-scale synthesis of these novel hybrid ligand structures.
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Affiliation(s)
- Andy A Thomas
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Klaus Speck
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Ilia Kevlishvili
- Department of Chemistry , University of Pittsburgh , Pittsburgh , Pennsylvania 15260 , United States
| | - Zhaohong Lu
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Peng Liu
- Department of Chemistry , University of Pittsburgh , Pittsburgh , Pennsylvania 15260 , United States
| | - Stephen L Buchwald
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
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24
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Zieliński A, Szczepaniak G, Gajda R, Woźniak K, Trzaskowski B, Vidović D, Kajetanowicz A, Grela K. Ruthenium Olefin Metathesis Catalysts Systematically Modified in Chelating Benzylidene Ether Fragment: Experiment and Computations. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800639] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Adam Zieliński
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Grzegorz Szczepaniak
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Roman Gajda
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Krzysztof Woźniak
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Bartosz Trzaskowski
- Centre of New Technologies University of Warsaw S. Banacha 2c 02‐097 Warsaw Poland
| | - Dragoslav Vidović
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Anna Kajetanowicz
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
| | - Karol Grela
- Biological and Chemical Research Centre Faculty of Chemistry University of Warsaw Żwirki i Wigury 101 02‐089 Warsaw Poland
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01‐224 Warsaw Poland
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