1
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Singh V, Jain H, Nath S, Adhikari D. Multielectron Redox Afforded by a Pincer Ligand Promoting Kumada Cross-Coupling Reactions. Chemistry 2023:e202303189. [PMID: 37988192 DOI: 10.1002/chem.202303189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/21/2023] [Accepted: 11/21/2023] [Indexed: 11/23/2023]
Abstract
The redox-active nature of a pincer has been exploited to conduct C-C cross-coupling reactions under mild conditions. A nickel complex with a NNN pincer was dimeric in the solid state, and the structure displayed a Ni2 N2 diamond core. In the dimeric structure, both ligand backbones house an electron, in the iminosemiquinonate form, to keep the metal's oxidation state at +2. In the presence of an aryl Grignard reagent, only 3 mol % loading the nickel complex generates a Kumada cross-coupled product in good yield from a wide variety of aryl-X (X= I, Br, Cl) substrates. That the ligand-based radical remains responsible for promoting such a coupling reaction following a radical pathway is suggested by TEMPO quenching. Furthermore, a radical-clock experiment along with tracing product distribution unambiguously supported the radical's involvement through the catalytic cycle. A series of thorough mechanistic probation, including computational DFT analysis, disclosed the cooperative action of both redox-active pincer ligand and the metal centre to drive the reaction.
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Affiliation(s)
- Vikramjeet Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306, India
| | - Harshit Jain
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306, India
| | - Shounak Nath
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, United States
| | - Debashis Adhikari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306, India
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2
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Logallo A, Hevia E. Applying Na/Co(II) bimetallic partnerships to promote multiple Co-H exchanges in polyfluoroarenes. Chem Commun (Camb) 2023; 59:5383-5386. [PMID: 37060131 PMCID: PMC10152514 DOI: 10.1039/d3cc01216f] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
Heterobimetallic base NaCo(HMDS)3 [HMDS = N(SiMe3)2] enables regioselective di-cobaltation of activated polyfluoroarenes under mild reaction conditions. For 1,3,5-C6H2X3 (X= Cl, F), NaCo(HMDS)3 in excess at 80 °C impressively induces the collective cleavage of five bonds (two C-H and three C-X) of the substrates via a cascade activation process that cannot be replicated by LiCo(HMDS)3 or KCo(HMDS)3.
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Affiliation(s)
- Alessandra Logallo
- Departement für Chemie, Biochemie und Pharmazie, Universität Bern, Bern, Switzerland.
| | - Eva Hevia
- Departement für Chemie, Biochemie und Pharmazie, Universität Bern, Bern, Switzerland.
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3
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Chen K, Zhu H, Li Y, Peng Q, Guo Y, Wang X. Dinuclear Cobalt Complex-Catalyzed Stereodivergent Semireduction of Alkynes: Switchable Selectivities Controlled by H 2O. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04141] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ke Chen
- Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
- State Key Laboratory of Oganometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Hongdan Zhu
- State Key Laboratory of Elemento-Organic Chemistry and Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Yuling Li
- State Key Laboratory of Oganometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Qian Peng
- State Key Laboratory of Elemento-Organic Chemistry and Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Yinlong Guo
- State Key Laboratory of Oganometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Xiaoming Wang
- State Key Laboratory of Oganometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
- School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou 310024, China
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4
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Rummelt SM, Peterson PO, Zhong H, Chirik PJ. Oxidative Addition of Aryl and Alkyl Halides to a Reduced Iron Pincer Complex. J Am Chem Soc 2021; 143:5928-5936. [PMID: 33829769 PMCID: PMC8293301 DOI: 10.1021/jacs.1c01486] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The two-electron oxidative addition of aryl and alkyl halides to a reduced iron dinitrogen complex with a strong-field tridentate pincer ligand has been demonstrated. Addition of iodobenzene or bromobenzene to (3,5-Me2MesCNC)Fe(N2)2 (3,5-Me2MesCNC = 2,6-(2,4,6-Me-C6H2-imidazol-2-ylidene)2-3,5-Me2-pyridine) resulted in rapid oxidative addition and formation of the diamagnetic, octahedral Fe(II) products (3,5-Me2MesCNC)Fe(Ph)(N2)(X), where X = I or Br. Competition experiments established the relative rate of oxidative addition of aryl halides as I > Br > Cl. A linear free energy of relative reaction rates of electronically differentiated aryl bromides (ρ = 1.5) was consistent with a concerted-type pathway. The oxidative addition of alkyl halides such as methyl-, isobutyl-, or neopentyl halides was also rapid at room temperature, but substrates with more accessible β-hydrogen positions (e.g., 1-bromobutane) underwent subsequent β-hydride elimination. Cyclization of an alkyl halide containing a radical clock and epimerization of neohexyl iodide-d2 upon oxidative addition to (3,5-Me2MesCNC)Fe(N2)2 are consistent with radical intermediates during C(sp3)-X bond cleavage. Importantly, while C(sp2)-X and C(sp3)-X oxidative addition produces net two-electron chemistry, the preferred pathway for obtaining the products is concerted and stepwise, respectively.
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Affiliation(s)
| | - Paul O. Peterson
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Hongyu Zhong
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J. Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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5
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Pabst TP, Chirik PJ. A Tutorial on Selectivity Determination in C(sp 2)-H Oxidative Addition of Arenes by Transition Metal Complexes. Organometallics 2021; 40:813-831. [PMID: 33867622 PMCID: PMC8045024 DOI: 10.1021/acs.organomet.1c00030] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Indexed: 01/07/2023]
Abstract
![]()
A Tutorial
on factors that determine the selectivity in C(sp2)–H
activation and functionalization reactions involving
two-electron oxidative addition processes with transition metals is
presented. The interplay of the thermodynamics of C(sp2)–H oxidative addition and kinetic influences upon regioselectivity
are presented alongside pedagogically valuable experimental and computational
results from the literature. Mechanisms and energetics of chelate-assisted
C(sp2)–H oxidative addition are examined, as are
concepts related to chemoselectivity in the oxidative addition of
C(sp2)–H or C(sp2)–X (X = F, Cl,
Br, I) bonds with aryl halide substrates.
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Affiliation(s)
- Tyler P Pabst
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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6
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Kyne SH, Lefèvre G, Ollivier C, Petit M, Ramis Cladera VA, Fensterbank L. Iron and cobalt catalysis: new perspectives in synthetic radical chemistry. Chem Soc Rev 2020; 49:8501-8542. [DOI: 10.1039/d0cs00969e] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Iron and cobalt complexes are at the origin of high valuable synthetic pathways involving radical intemediates.
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Affiliation(s)
- Sara H. Kyne
- School of Chemistry
- Faculty of Science
- Monash University
- Clayton
- Australia
| | - Guillaume Lefèvre
- i-CLeHS CSB2D
- Chimie ParisTech
- 11 rue Pierre et Marie Curie
- FR 75005 Paris
- France
| | - Cyril Ollivier
- Sorbonne Université
- CNRS
- UMR8232
- Institut Parisien de Chimie Moléculaire
- F-75252 Paris Cedex 05
| | - Marc Petit
- Sorbonne Université
- CNRS
- UMR8232
- Institut Parisien de Chimie Moléculaire
- F-75252 Paris Cedex 05
| | | | - Louis Fensterbank
- Sorbonne Université
- CNRS
- UMR8232
- Institut Parisien de Chimie Moléculaire
- F-75252 Paris Cedex 05
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7
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Recent advances in the chemistry of group 9—Pincer organometallics. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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8
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Zhang S, Song Y, He X, Angamuthu R, Tung CH, Wang W. Reductive Coupling of Bridging Diaryl Ligands in Half-Sandwich Cobalt(II) Dimers: Revisiting Triple-Decker Cobalt(I) Complexes. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00439] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Shengnan Zhang
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, PR China
| | - Yike Song
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, PR China
| | - Xueshan He
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, PR China
| | - Raja Angamuthu
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC), Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Chen-Ho Tung
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, PR China
| | - Wenguang Wang
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, PR China
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9
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Rummelt SM, Zhong H, Léonard NG, Semproni SP, Chirik PJ. Oxidative Addition of Dihydrogen, Boron Compounds, and Aryl Halides to a Cobalt(I) Cation Supported by a Strong-Field Pincer Ligand. Organometallics 2019; 38:1081-1090. [PMID: 30962670 DOI: 10.1021/acs.organomet.8b00870] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cationic cobalt(I) dinitrogen complexes with a strong-field tridentate pincer ligand were prepared and the oxidative addition of polar and non-polar bonds was studied. Addition of H2 to [(iPrPNP)Co(N2)]+ (iPrPNP = 2,6-bis((diisopropylphosphaneyl)methyl)pyridine) in THF-d8 resulted in rapid oxidative addition and formation of the cis-Co(III) dihydride complex, cis-[(iPrPNP)Co(H)2L]+ where L = THF or N2. The addition of H2 was reversible as evidenced by the dynamics observed by variable temperature 1H NMR spectroscopy and the regeneration of [(iPrPNP)Co(N2)]+ upon exposure to dinitrogen. In contrast, addition of HBPin, (Pin = pinacolato) B2Pin2 and aryl halides resulted in the formation of net one-electron oxidation products: cationic Co(II)-boryl and Co(II)-halide/aryl complexes, respectively. All products were structurally characterized by X-ray crystallography and the electronic structures were determined by a combination of magnetic moment measurements, EPR spectroscopy and DFT calculations. Monitoring the addition of HBPin to [(iPrPNP)Co(N2)]+ provided evidence for a transient Co(III) oxidative addition product that likely undergoes comproportionation with the cobalt(I) starting material to generate the observed Co(II) products.
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Affiliation(s)
- Stephan M Rummelt
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Hongyu Zhong
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Nadia G Léonard
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Scott P Semproni
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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10
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Römelt C, Weyhermüller T, Wieghardt K. Structural characteristics of redox-active pyridine-1,6-diimine complexes: Electronic structures and ligand oxidation levels. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.09.018] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Alig L, Fritz M, Schneider S. First-Row Transition Metal (De)Hydrogenation Catalysis Based On Functional Pincer Ligands. Chem Rev 2018; 119:2681-2751. [PMID: 30596420 DOI: 10.1021/acs.chemrev.8b00555] [Citation(s) in RCA: 497] [Impact Index Per Article: 82.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The use of 3d metals in de/hydrogenation catalysis has emerged as a competitive field with respect to "traditional" precious metal catalyzed transformations. The introduction of functional pincer ligands that can store protons and/or electrons as expressed by metal-ligand cooperativity and ligand redox-activity strongly stimulated this development as a conceptual starting point for rational catalyst design. This review aims at providing a comprehensive picture of the utilization of functional pincer ligands in first-row transition metal hydrogenation and dehydrogenation catalysis and related synthetic concepts relying on these such as the hydrogen borrowing methodology. Particular emphasis is put on the implementation and relevance of cooperating and redox-active pincer ligands within the mechanistic scenarios.
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Affiliation(s)
- Lukas Alig
- Universität Göttingen , Institut für Anorganische Chemie , Tammannstrasse 4 , D-37077 Göttingen , Germany
| | - Maximilian Fritz
- Universität Göttingen , Institut für Anorganische Chemie , Tammannstrasse 4 , D-37077 Göttingen , Germany
| | - Sven Schneider
- Universität Göttingen , Institut für Anorganische Chemie , Tammannstrasse 4 , D-37077 Göttingen , Germany
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12
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13
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Asghar S, Tailor SB, Elorriaga D, Bedford RB. Cobalt-Catalyzed Suzuki Biaryl Coupling of Aryl Halides. Angew Chem Int Ed Engl 2017; 56:16367-16370. [PMID: 29135071 PMCID: PMC5767760 DOI: 10.1002/anie.201710053] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Indexed: 12/28/2022]
Abstract
Readily accessed cobalt pre-catalysts with N-heterocyclic carbene ligands catalyze the Suzuki cross-coupling of aryl chlorides and bromides with alkyllithium-activated arylboronic pinacolate esters. Preliminary mechanistic studies indicate that the cobalt species is reduced to Co0 during the reaction.
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Affiliation(s)
- Soneela Asghar
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
- Department of Chemistry and Chemical EngineeringSBA School of Science & EngineeringLahore University of Management SciencesLahore54792Pakistan
| | - Sanita B. Tailor
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - David Elorriaga
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Robin B. Bedford
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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14
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Andersen TL, Donslund AS, Neumann KT, Skrydstrup T. Carbonylative Coupling of Alkyl Zinc Reagents with Benzyl Bromides Catalyzed by a Nickel/NN
2
Pincer Ligand Complex. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201710089] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Thomas L. Andersen
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO)Aarhus University Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Aske S. Donslund
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO)Aarhus University Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Karoline T. Neumann
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO)Aarhus University Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Troels Skrydstrup
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO)Aarhus University Gustav Wieds Vej 14 8000 Aarhus C Denmark
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15
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Andersen TL, Donslund AS, Neumann KT, Skrydstrup T. Carbonylative Coupling of Alkyl Zinc Reagents with Benzyl Bromides Catalyzed by a Nickel/NN 2 Pincer Ligand Complex. Angew Chem Int Ed Engl 2017; 57:800-804. [PMID: 29193522 DOI: 10.1002/anie.201710089] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 11/07/2017] [Indexed: 12/22/2022]
Abstract
An efficient catalytic protocol for the three-component assembly of benzyl bromides, carbon monoxide, and alkyl zinc reagents to give benzyl alkyl ketones is described, and represents the first nickel-catalyzed carbonylative coupling of two sp3 -carbon fragments. The method, which relies on the application of nickel complexed with an NN2 -type pincer ligand and a controlled release of CO gas from a solid precursor, works well with a range of benzylic bromides. Mechanistic studies suggest the intermediacy of carbon-centered radicals.
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Affiliation(s)
- Thomas L Andersen
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Aske S Donslund
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Karoline T Neumann
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Troels Skrydstrup
- Carbon Dioxide Activation Center (CADIAC), Department of Chemistry and the Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
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16
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Asghar S, Tailor SB, Elorriaga D, Bedford RB. Cobalt-Catalyzed Suzuki Biaryl Coupling of Aryl Halides. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201710053] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Soneela Asghar
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
- Department of Chemistry and Chemical Engineering; SBA School of Science & Engineering; Lahore University of Management Sciences; Lahore 54792 Pakistan
| | - Sanita B. Tailor
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - David Elorriaga
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Robin B. Bedford
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
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17
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18
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Haines BE, Kawakami T, Kuwata K, Murakami K, Itami K, Musaev DG. Cu-Catalyzed aromatic C-H imidation with N-fluorobenzenesulfonimide: mechanistic details and predictive models. Chem Sci 2017; 8:988-1001. [PMID: 28451236 PMCID: PMC5354063 DOI: 10.1039/c6sc04145k] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 10/18/2016] [Indexed: 11/21/2022] Open
Abstract
The LCuBr-catalyzed C-H imidation of arenes by N-fluorobenzenesulfonimide (NFSI), previously reported by us, utilizes an inexpensive catalyst and is applicable to a broad scope of complex arenes. The computational and experimental study reported here shows that the mechanism of the reaction is comprised of two parts: (1) generation of the active dinuclear CuII-CuII catalyst; and (2) the catalytic cycle for the C-H bond imidation of arenes. Computations show that the LCuIBr complex used in experiments is not an active catalyst. Instead, upon reacting with NFSI it converts to an active dinuclear CuII-CuII catalyst that is detected using HRMS techniques. The catalytic cycle starting from the CuII-CuII dinuclear complex proceeds via (a) one-electron oxidation of the active catalyst by NFSI to generate an imidyl radical and dinuclear CuII-CuIII intermediate, (b) turnover-limiting single-electron-transfer (SET1) from the arene to the imidyl radical, (c) fast C-N bond formation with an imidyl anion and an aryl radical cation, (d) reduction of the CuII-CuIII dinuclear intermediate by the aryl radical to regenerate the active catalyst and produce an aryl-cation intermediate, and (e) deprotonation and rearomatization of the arene ring to form the imidated product. The calculated KIE for the turnover-limiting SET1 step reproduces its experimentally observed value. A simple predictive tool was developed and experimentally validated to determine the regiochemical outcome for a given substrate. We demonstrated that the pre-reaction LCuX complexes, where X = Cl, Br and I, show a similar reactivity pattern as these complexes convert to the same catalytically active dinuclear CuII-CuII species.
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Affiliation(s)
- Brandon E Haines
- Cherry L. Emerson Center for Scientific Computation , Department of Chemistry , Emory University , Atlanta , Georgia 30322 , USA .
| | - Takahiro Kawakami
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science , Nagoya University , Chikusa , Nagoya 464-8602 , Japan
| | - Keiko Kuwata
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science , Nagoya University , Chikusa , Nagoya 464-8602 , Japan
| | - Kei Murakami
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science , Nagoya University , Chikusa , Nagoya 464-8602 , Japan
| | - Kenichiro Itami
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science , Nagoya University , Chikusa , Nagoya 464-8602 , Japan
- JST-ERATO , Itami Molecular Nanocarbon Project , Nagoya University , Chikusa , Nagoya 464-8602 , Japan .
| | - Djamaladdin G Musaev
- Cherry L. Emerson Center for Scientific Computation , Department of Chemistry , Emory University , Atlanta , Georgia 30322 , USA .
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19
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Raya B, Biswas S, RajanBabu TV. Selective Cobalt-Catalyzed Reduction of Terminal Alkenes and Alkynes Using (EtO) 2Si(Me)H as a Stoichiometric Reductant. ACS Catal 2016; 6:6318-6323. [PMID: 28078166 DOI: 10.1021/acscatal.6b02272] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
While attempting to effect Co-catalyzed hydrosilylation of β-vinyl trimethylsilyl enol ethers we discovered that depending on the silane, solvent and the method of generation of the reduced cobalt catalyst, a highly efficient and selective reduction or hydrosilylation of an alkene can be achieved. This paper deals with this reduction reaction, which has not been reported before in spite of the huge research activity in this area. The reaction, which uses an air-stable [2,6-di(aryliminoyl)pyridine)]CoCl2 activated by 2 equivalents of NaEt3BH as a catalyst (0.001-0.05 equiv) and (EtO)2SiMeH as the hydrogen source, is best run at ambient temperature in toluene and is highly selective for the reduction of simple unsubstituted 1-alkenes and the terminal double bonds in 1,3- and 1,4-dienes, β-vinyl ketones and silyloxy dienes. The reaction is tolerant of various functional groups such as a bromide, alcohol, amine, carbonyl, and di or trisubstituted double bonds, and water. Highly selective reduction of a terminal alkyne to either an alkene or alkane can be accomplished by using stoichiometric amounts of the silane. Preliminary mechanistic studies indicate that the reaction is stoichiometric in the silane and both hydrogens in the product come from the silane.
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Affiliation(s)
- Balaram Raya
- Department of Chemistry and
Biochemistry, 100 West
18th Avenue, The Ohio State University, Columbus, Ohio 43210, United States
| | - Souvagya Biswas
- Department of Chemistry and
Biochemistry, 100 West
18th Avenue, The Ohio State University, Columbus, Ohio 43210, United States
| | - T. V. RajanBabu
- Department of Chemistry and
Biochemistry, 100 West
18th Avenue, The Ohio State University, Columbus, Ohio 43210, United States
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20
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Kaur M, Sharma E, Singh A, Singh P, Singh KN. Experimental and Theoretical Observations on the Intramolecular Nucleophilic Addition of α-Amino Carbanions to Arynes: Synthesis of 1-Aryl-1,2,3,4-tetrahydroisoquinolines. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600567] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Manjot Kaur
- Department of Chemistry and Centre of Advanced Studies in Chemistry; Panjab University; 160014 Chandigarh India
| | - Esha Sharma
- Department of Chemistry and Centre of Advanced Studies in Chemistry; Panjab University; 160014 Chandigarh India
| | - Amritpal Singh
- Department of Chemistry and Centre of Advanced Studies in Chemistry; Panjab University; 160014 Chandigarh India
| | - Paramjit Singh
- Department of Chemistry and Centre of Advanced Studies in Chemistry; Panjab University; 160014 Chandigarh India
| | - Kamal Nain Singh
- Department of Chemistry and Centre of Advanced Studies in Chemistry; Panjab University; 160014 Chandigarh India
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21
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Zhang S, Fallah H, Gardner EJ, Kundu S, Bertke JA, Cundari TR, Warren TH. A Dinitrogen Dicopper(I) Complex via a Mixed‐Valence Dicopper Hydride. Angew Chem Int Ed Engl 2016; 55:9927-31. [DOI: 10.1002/anie.201603970] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Revised: 06/14/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Shiyu Zhang
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Hengameh Fallah
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM) University of North Texas Denton TX 76203 USA
| | - Evan J. Gardner
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Subrata Kundu
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Jeffery A. Bertke
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Thomas R. Cundari
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM) University of North Texas Denton TX 76203 USA
| | - Timothy H. Warren
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
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22
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Zhang S, Fallah H, Gardner EJ, Kundu S, Bertke JA, Cundari TR, Warren TH. A Dinitrogen Dicopper(I) Complex via a Mixed‐Valence Dicopper Hydride. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201603970] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shiyu Zhang
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Hengameh Fallah
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM) University of North Texas Denton TX 76203 USA
| | - Evan J. Gardner
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Subrata Kundu
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Jeffery A. Bertke
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Thomas R. Cundari
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM) University of North Texas Denton TX 76203 USA
| | - Timothy H. Warren
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
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23
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Qian YY, Lee MH, Yang W, Chan KS. Aryl carbon–chlorine (Ar–Cl) and aryl carbon–fluorine (Ar–F) bond cleavages by rhodium porphyrins. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.05.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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24
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Lindley BM, Wolczanski PT, Cundari TR, Lobkovsky EB. First-Row Transition Metal and Lithium Pyridine-ene-amide Complexes Exhibiting N- and C-Isomers and Ligand-Based Activation of Benzylic C–H Bonds. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00385] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brian M. Lindley
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Peter T. Wolczanski
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Thomas R. Cundari
- Department of Chemistry, Center for Advanced
Scientific Computing and Modeling (CASCaM), University of North Texas, Box 305070, Denton, Texas 76203-5070, United States
| | - Emil B. Lobkovsky
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
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25
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Schmidt VA, Hoyt JM, Margulieux GW, Chirik PJ. Cobalt-Catalyzed [2π + 2π] Cycloadditions of Alkenes: Scope, Mechanism, and Elucidation of Electronic Structure of Catalytic Intermediates. J Am Chem Soc 2015; 137:7903-14. [PMID: 26030841 PMCID: PMC5633266 DOI: 10.1021/jacs.5b04034] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
![]()
Aryl-substituted bis(imino)pyridine
cobalt dinitrogen compounds,
(RPDI)CoN2, are effective precatalysts for the
intramolecular [2π + 2π] cycloaddition of α,ω-dienes
to yield the corresponding bicyclo[3.2.0]heptane derivatives. The
reactions proceed under mild thermal conditions with unactivated alkenes,
tolerating both amine and ether functional groups. The overall second
order rate law for the reaction, first order with respect to both
the cobalt precatalyst and the substrate, in combination with electron
paramagnetic resonance (EPR) spectroscopic studies established the
catalyst resting state as dependent on the identity of the precatalyst
and diene substrate. Planar S =1/2 κ3-bis(imino)pyridine cobalt alkene and
tetrahedral κ2-bis(imino)pyridine cobalt diene complexes
were observed by EPR spectroscopy and in the latter case structurally
characterized. The hemilabile chelate facilitates conversion of a
principally ligand-based singly occupied molecular orbital (SOMO)
in the cobalt dinitrogen and alkene compounds to a metal-based SOMO
in the diene intermediates, promoting C–C bond-forming oxidative
cyclization. Structure–activity relationships on bis(imino)pyridine
substitution were also established with 2,4,6-tricyclopentyl-substituted
aryl groups, resulting in optimized catalytic [2π + 2π]
cycloaddition. The cyclopentyl groups provide a sufficiently open
metal coordination sphere that encourages substrate coordination while
remaining large enough to promote a challenging, turnover-limiting
C(sp3)–C(sp3) reductive elimination.
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Affiliation(s)
- Valerie A Schmidt
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Jordan M Hoyt
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Grant W Margulieux
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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26
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Komeyama K, Asakura R, Fukuoka H, Takaki K. Cobalt-catalyzed intermolecular stereoselective bisbenzylation of alkynes. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.02.101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Komeyama K, Okamoto Y, Takaki K. Cobalt-Catalyzed Formal [4+2] Cycloaddition of α,α′-Dichloro-ortho-Xylenes with Alkynes. Angew Chem Int Ed Engl 2014; 53:11325-8. [DOI: 10.1002/anie.201406807] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Indexed: 11/11/2022]
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28
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Komeyama K, Okamoto Y, Takaki K. Cobalt-Catalyzed Formal [4+2] Cycloaddition of α,α′-Dichloro-ortho-Xylenes with Alkynes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406807] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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29
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Liu CR, Qian YY, Chan KS. Base-promoted aryl–bromine bond cleavage with cobalt(ii) porphyrins via a halogen atom transfer mechanism. Dalton Trans 2014; 43:7771-9. [DOI: 10.1039/c4dt00155a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Pellegrino J, Gaviglio C, Milstein D, Doctorovich F. Electron Transfer Behavior of Pincer-Type {RhNO}8 Complexes: Spectroscopic Characterization and Reactivity of Paramagnetic {RhNO}9 Complexes. Organometallics 2013. [DOI: 10.1021/om4008746] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan Pellegrino
- Departamento
de Química Inorgánica, Analítica, y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, INQUIMAE-CONICET, Ciudad Universitaria, Pab. 2, C1428EHA, Buenos Aires, Argentina
| | - Carina Gaviglio
- Departamento
de Química Inorgánica, Analítica, y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, INQUIMAE-CONICET, Ciudad Universitaria, Pab. 2, C1428EHA, Buenos Aires, Argentina
| | - David Milstein
- Department
of Organic Chemistry and Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Fabio Doctorovich
- Departamento
de Química Inorgánica, Analítica, y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, INQUIMAE-CONICET, Ciudad Universitaria, Pab. 2, C1428EHA, Buenos Aires, Argentina
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31
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Breitenfeld J, Ruiz J, Wodrich MD, Hu X. Bimetallic Oxidative Addition Involving Radical Intermediates in Nickel-Catalyzed Alkyl–Alkyl Kumada Coupling Reactions. J Am Chem Soc 2013; 135:12004-12. [DOI: 10.1021/ja4051923] [Citation(s) in RCA: 208] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Jan Breitenfeld
- Institute
of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI,
BCH 3305, Lausanne, CH 1015, Switzerland
| | - Jesus Ruiz
- Institute
of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI,
BCH 3305, Lausanne, CH 1015, Switzerland
| | - Matthew D. Wodrich
- Institute
of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI,
BCH 3305, Lausanne, CH 1015, Switzerland
| | - Xile Hu
- Institute
of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI,
BCH 3305, Lausanne, CH 1015, Switzerland
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32
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Hojilla Atienza CC, Milsmann C, Semproni SP, Turner ZR, Chirik PJ. Reversible Carbon–Carbon Bond Formation Induced by Oxidation and Reduction at a Redox-Active Cobalt Complex. Inorg Chem 2013; 52:5403-17. [DOI: 10.1021/ic400352r] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
| | - Carsten Milsmann
- Department of Chemistry, Princeton
University, Princeton,
New Jersey 08544, United States
| | - Scott P. Semproni
- Department of Chemistry, Princeton
University, Princeton,
New Jersey 08544, United States
| | - Zoë R. Turner
- Department of Chemistry, Princeton
University, Princeton,
New Jersey 08544, United States
| | - Paul J. Chirik
- Department of Chemistry, Princeton
University, Princeton,
New Jersey 08544, United States
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33
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Shuster V, Gambarotta S, Nikiforov GB, Budzelaar PHM. Heterometallic Aluminum–Chromium Phenazine and Thiophenazine Complexes. Formation of a Tetranuclear Chromium(I) Sandwich Complex. Organometallics 2013. [DOI: 10.1021/om3012097] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vladimir Shuster
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada
| | - Sandro Gambarotta
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada
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34
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Sazonov PK, Ptushkin DS, Khrustalev VN, Kolotyrkina NG, Beletskaya IP. Radical-chain oxidative addition mechanism for the reaction of an [Re(CO)5]- anion with α-bromostilbene. Dalton Trans 2013; 42:4223-32. [PMID: 23292281 DOI: 10.1039/c2dt32552g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
E-α-Bromostilbene spontaneously reacts with Na[Re(CO)(5)] at 22 °C in THF to give Na[ReBr(CO)(4){Z-C(Ph)=CHPh}] and Na[Re(2)(CO)(9){Z-C(Ph)=CHPh}] as the main products. Z-α-Bromostilbene is less reactive, but gives the same products. The reaction is stimulated by visible light or a source of solvated electrons (NaK(2.8)) and can be inhibited by a quinomethide radical trap. With an excess of Na[Re(CO)(5)] one can observe the initial formation of Na[ReBr(CO)(4){Z-C(Ph)=CHPh}] and its complete transformation into Na[Re(2)(CO)(9){Z-C(Ph)=CHPh}]. Treatment of Na[ReBr(CO)(4){Z-C(Ph)=CHPh}] with CO almost quantitatively converts it to [Re(CO)(5){Z-C(Ph)=CHPh}], the structure of which is established by a single-crystal X-ray diffraction study. A radical-chain mechanism is proposed for the reaction comprising the following steps: (a) coupling of a Vin˙ radical with Na[Re(CO)(5)], (b) CO-dissociation from the formed 19-electron radical-anion and (c) bromine atom abstraction by [Re(CO)(4){Z-C(Ph)=CHPh}]˙(-) from α-bromostilbene. The mechanism is confirmed by the formation of the same Na[ReBr(CO)(4){Z-C(Ph)=CHPh}] product in the presence of NaI. When the radical-chain process is inhibited, a slow halogenophilic reaction is observed, mainly giving the Z and E-isomers of the acylrhenate Na[Re(2)(CO)(9){C(O)C(Ph)=CHPh}].
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Affiliation(s)
- Petr K Sazonov
- Chemistry Department of the M.V. Lomonosov Moscow State University, 119992, Moscow, Russia.
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35
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Williams VA, Hulley EB, Wolczanski PT, Lancaster KM, Lobkovsky EB. Exploring the limits of redox non-innocence: pseudo square planar [{κ4-Me2C(CH2NCHpy)2}Ni]n (n = 2+, 1+, 0, −1, −2) favor Ni(ii). Chem Sci 2013. [DOI: 10.1039/c3sc50743b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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36
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Darmon JM, Stieber SCE, Sylvester KT, Fernández I, Lobkovsky E, Semproni SP, Bill E, Wieghardt K, DeBeer S, Chirik PJ. Oxidative addition of carbon-carbon bonds with a redox-active bis(imino)pyridine iron complex. J Am Chem Soc 2012; 134:17125-37. [PMID: 23043331 PMCID: PMC3777725 DOI: 10.1021/ja306526d] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Addition of biphenylene to the bis(imino)pyridine iron dinitrogen complexes, ((iPr)PDI)Fe(N(2))(2) and [((Me)PDI)Fe(N(2))](2)(μ(2)-N(2)) ((R)PDI = 2,6-(2,6-R(2)-C(6)H(3)-N═CMe)(2)C(5)H(3)N; R = Me, (i)Pr), resulted in oxidative addition of a C-C bond at ambient temperature to yield the corresponding iron biphenyl compounds, ((R)PDI)Fe(biphenyl). The molecular structures of the resulting bis(imino)pyridine iron metallacycles were established by X-ray diffraction and revealed idealized square pyramidal geometries. The electronic structures of the compounds were studied by Mössbauer spectroscopy, NMR spectroscopy, magnetochemistry, and X-ray absorption and X-ray emission spectroscopies. The experimental data, in combination with broken-symmetry density functional theory calculations, established spin crossover (low to intermediate spin) ferric compounds antiferromagnetically coupled to bis(imino)pyridine radical anions. Thus, the overall oxidation reaction involves cooperative electron loss from both the iron center and the redox-active bis(imino)pyridine ligand.
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Affiliation(s)
- Jonathan M. Darmon
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - S. Chantal E. Stieber
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Kevin T. Sylvester
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
| | - Ignacio Fernández
- Área de Química Orgánica, Universidad de Almería, Carretera de Sacramento s/n, 04120, Almería, Spain
| | - Emil Lobkovsky
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
| | - Scott P. Semproni
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Eckhard Bill
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Karl Wieghardt
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14850, United States
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Paul J. Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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37
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Shuster V, Gambarotta S, Nikiforov GB, Korobkov I, Budzelaar PHM. Radical Cleavage of Al–C Bonds Promoted by Phenazine: From Noninnocent Ligand to Radical Abstractor. Organometallics 2012. [DOI: 10.1021/om300889m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vladimir Shuster
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada
| | - Sandro Gambarotta
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada
| | | | - Ilia Korobkov
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada
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38
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Malassa A, Agthe C, Görls H, Westerhausen M. Bis[μ- N-( tert-butyldimethylsilyl)- N-(pyridin-2-ylmethyl)amido]bis[methylcobalt(II)]. Acta Crystallogr Sect E Struct Rep Online 2012; 68:m1167-8. [PMID: 22969464 PMCID: PMC3435591 DOI: 10.1107/s1600536812032321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Accepted: 07/16/2012] [Indexed: 12/05/2022]
Abstract
The green title complex, [Co2(CH3)2(C12H21N2Si)2], was obtained from bis{[μ-N-tert-butyldimethylsilyl-N-(pyridin-2-ylmethyl)amido]chloridocobalt(II)} and methyllithium in diethyl ether at 195 K via a metathesis reaction. The dimeric cobalt(II) complex exhibits a crystallographic center of inversion in the middle of the Co2N2 ring (average Co—N = 2.050 Å). The CoII atom shows a distorted tetrahedral coordination sphere. The exocyclic Co—N bond length to the pyridyl group shows a similar value of 2.045 (4) Å. The exocyclic methyl group has a rather long Co—C bond length of 2.019 (5) Å.
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39
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Qian YY, Chan KS. Base-Promoted Aryl Carbon–Iodine and Carbon–Bromine Bond Cleavage with Rhodium Porphyrin Complexes: Scope and Mechanism. Organometallics 2012. [DOI: 10.1021/om300441p] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ying Ying Qian
- Department of Chemistry, The Chinese University of Hong Kong,
Shatin, New Territories, Hong Kong, People’s Republic of China
| | - Kin Shing Chan
- Department of Chemistry, The Chinese University of Hong Kong,
Shatin, New Territories, Hong Kong, People’s Republic of China
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40
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Zhu D, Korobkov I, Budzelaar PHM. Radical Mechanisms in the Reaction of Organic Halides with Diiminepyridine Cobalt Complexes. Organometallics 2012. [DOI: 10.1021/om300182c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Di Zhu
- Department of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Ilia Korobkov
- Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
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41
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Dugan TR, Goldberg JM, Brennessel WW, Holland PL. Low-Coordinate Cobalt Fluoride Complexes: Synthesis, Reactions, and Production from C–F Activation Reactions. Organometallics 2012. [DOI: 10.1021/om200991k] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas R. Dugan
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Jonathan M. Goldberg
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - William W. Brennessel
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Patrick L. Holland
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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42
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MacLeod KC, Patrick BO, Smith KM. Reactivity of Cr(III) μ-Oxo Compounds: Catalyst Regeneration and Atom Transfer Processes. Inorg Chem 2011; 51:688-700. [PMID: 22175660 DOI: 10.1021/ic202233f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- K. Cory MacLeod
- Department of Chemistry, University of British Columbia Okanagan, 3333 University
Way, Kelowna, BC, Canada V1V 1V7
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, Vancouver, British
Columbia, Canada V6T 1Z1
| | - Kevin M. Smith
- Department of Chemistry, University of British Columbia Okanagan, 3333 University
Way, Kelowna, BC, Canada V1V 1V7
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43
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Cheung CW, Chan KS. Base-Promoted Selective Aryl C–Cl Cleavage by Iridium(III) Porphyrins via a Metalloradical Ipso Addition–Elimination Mechanism. Organometallics 2011. [DOI: 10.1021/om200618m] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chi Wai Cheung
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
| | - Kin Shing Chan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
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44
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Dugan TR, Sun X, Rybak-Akimova EV, Olatunji-Ojo O, Cundari TR, Holland PL. A Masked Two-Coordinate Cobalt(I) Complex That Activates C–F Bonds. J Am Chem Soc 2011; 133:12418-21. [DOI: 10.1021/ja2052914] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas R. Dugan
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Xianru Sun
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Elena V. Rybak-Akimova
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Olayinka Olatunji-Ojo
- CASCaM, Department of Chemistry, University of North Texas, Denton, Texas 76203, United States
| | - Thomas R. Cundari
- CASCaM, Department of Chemistry, University of North Texas, Denton, Texas 76203, United States
| | - Patrick L. Holland
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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Cheung CW, Chan KS. Base-Promoted Selective Aryl C–Br and C–I Bond Cleavage by Iridium(III) Porphyrin: Reduction of IrIII–OH to IrII for Metalloradical Ipso Substitution of Aryl–Halogen Bonds. Organometallics 2011. [DOI: 10.1021/om200251k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chi Wai Cheung
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
| | - Kin Shing Chan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
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46
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Zhu D, Thapa I, Korobkov I, Gambarotta S, Budzelaar PHM. Redox-active ligands and organic radical chemistry. Inorg Chem 2011; 50:9879-87. [PMID: 21520927 DOI: 10.1021/ic2002145] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Knowledge about bonding in diiminepyridine (L) halide, alkyl, and dinitrogen complexes of the metals iron, cobalt, and nickel is summarized, and two new examples are added to the set: L(1)Ni(Me) and L(1)Ni(N(2)). Reactivity of these types of complexes is discussed in terms of organic radical chemistry. New C-C couplings with L(2)CoAr complexes are described and proposed to involve halide abstraction and radical coupling. Calculations support the high tendency of the diiminepyridine ligand to accept an electron coming from a metal-carbon bond and so facilitate loss of a radical.
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Affiliation(s)
- Di Zhu
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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47
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Cheung CW, Chan KS. Base-Promoted Selective Aryl Carbon−Bromine Bond Cleavage by Iridium(III) Porphyrin for Iridium(III) Porphyrin Aryl Synthesis: A Metalloradical Ipso Addition−Elimination Mechanism. Organometallics 2011. [DOI: 10.1021/om200027q] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chi Wai Cheung
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
| | - Kin Shing Chan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
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48
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MacLeod KC, Patrick BO, Smith KM. Chromium-Catalyzed Radical Cyclization of Bromo and Chloro Acetals. Organometallics 2010. [DOI: 10.1021/om101068r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Cory MacLeod
- Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC, Canada V1V 1V7
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, Vancouver, BC, Canada V6T 1Z1
| | - Kevin M. Smith
- Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC, Canada V1V 1V7
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