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Portugués A, López‐García I, Jiménez‐Bernad J, Bautista D, Gil‐Rubio J. Photoinitiated Reactions of Haloperfluorocarbons with Gold(I) Organometallic Complexes: Perfluoroalkyl Gold(I) and Gold(III) Complexes. Chemistry 2019; 25:15535-15547. [DOI: 10.1002/chem.201903058] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Alejandro Portugués
- Departamento de Química InorgánicaFacultad de QuímicaUniversidad de Murcia Campus de Espinardo 30100 Murcia Spain
| | - Inmaculada López‐García
- Departamento de Química InorgánicaFacultad de QuímicaUniversidad de Murcia Campus de Espinardo 30100 Murcia Spain
| | - Javier Jiménez‐Bernad
- Departamento de Química InorgánicaFacultad de QuímicaUniversidad de Murcia Campus de Espinardo 30100 Murcia Spain
| | - Delia Bautista
- ACTI.Universidad de Murcia Campus de Espinardo 30100 Murcia Spain
| | - Juan Gil‐Rubio
- Departamento de Química InorgánicaFacultad de QuímicaUniversidad de Murcia Campus de Espinardo 30100 Murcia Spain
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2
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Leclerc MC, Gabidullin BM, Da Gama JG, Daifuku SL, Iannuzzi TE, Neidig ML, Baker RT. Transition-Metal-Free Formation of C-E Bonds (E = C, N, O, S) and Formation of C-M Bonds (M = Mn, Mo) from N-Heterocyclic Carbene Mediated Fluoroalkene C-F Bond Activation. Organometallics 2017; 36:849-857. [PMID: 28670045 DOI: 10.1021/acs.organomet.6b00908] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, a recently reported polyfluoroalkenyl imidazolium salt is shown to react with nitrogen-, oxygen- and sulfur-based nucleophiles at the C β position in a stereoselective and regioselective fashion, without the use of a transition metal. In contrast, reactivity with 1-methylimidazole demonstrates net substitution at C α . This product reacts quantitatively with water, affording clean transformation of a difluoromethylene group to give an α,β-unsaturated trifluoromethyl ketone. Further reactivity studies demonstrate that the difluoromethyl fragment of an N-heterocyclic fluoroalkene is capable of direct C-C bond formation with NaCp through loss of sodium fluoride and double C-F bond activation (Cp = cyclopentadienide). TD-DFT calculations of this product indicate that both the HOMO and LUMO are of mixed π/π* character and are delocalized over the N-heterocyclic and Cp fragments, giving rise to a very intense absorption feature in the UV-vis spectrum. Additionally, two carbonylmetalate-substituted fluorovinyl imidazolium complexes featuring Mn and Mo were isolated and fully characterized.
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Affiliation(s)
- Matthew C Leclerc
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Bulat M Gabidullin
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Jason G Da Gama
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Stephanie L Daifuku
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Theresa E Iannuzzi
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Michael L Neidig
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - R Tom Baker
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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3
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Heinrich D, Schmolke W, Lentz D. Coordination chemistry and oxidative addition of trifluorovinylferrocene derivatives. J Fluor Chem 2016. [DOI: 10.1016/j.jfluchem.2016.10.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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4
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Yuan J, Hughes RP, Rheingold AL. A (pentafluoroethyl)(trifluoromethyl)carbene complex of iridium and reductive activation of its sp3 α, β, and γ carbon–fluorine bonds to give perfluoro-2-butyne, perfluoro-1,2,3-butatriene and perfluoro-1-irida-2-methyl-2-cyclobutene) complexes. Dalton Trans 2015; 44:19518-27. [DOI: 10.1039/c5dt02075a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Inner-sphere reduction of a (pentafluoroethyl)(trifluoromethyl)carbene ligand affords perfluorobutyne, perfluorobutatriene and perfluorometallacyclobutene ligands.
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Affiliation(s)
- Jian Yuan
- Department of Chemistry
- 6128 Burke Laboratory
- Dartmouth College
- Hanover
- USA
| | - Russell P. Hughes
- Department of Chemistry
- 6128 Burke Laboratory
- Dartmouth College
- Hanover
- USA
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5
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Kuehnel MF, Lentz D, Braun T. Synthesis of Fluorinated Building Blocks by Transition-Metal-Mediated Hydrodefluorination Reactions. Angew Chem Int Ed Engl 2013; 52:3328-48. [DOI: 10.1002/anie.201205260] [Citation(s) in RCA: 313] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Indexed: 11/06/2022]
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6
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Kuehnel MF, Lentz D, Braun T. Synthese fluorierter Bausteine durch Übergangsmetall-vermittelte Hydrodefluorierungsreaktionen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201205260] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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7
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Slaney ME, Anderson DJ, Ristic-Petrovic D, McDonald R, Cowie M. Facile Carbon-Fluorine Bond Activation and Subsequent Functionalisation of 1,1-Difluoroethylene and Tetrafluoroethylene Promoted by Adjacent Metal Centres. Chemistry 2012; 18:4723-37. [DOI: 10.1002/chem.201101835] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 11/30/2011] [Indexed: 11/11/2022]
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8
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Slaney ME, Ferguson MJ, McDonald R, Cowie M. Tandem C–F and C–H Bond Activation in Fluoroolefins Promoted by a Bis(diethylphosphino)methane-Bridged Diiridium Complex: Role of Water in the Activation Processes. Organometallics 2012. [DOI: 10.1021/om2011968] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael E. Slaney
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | - Michael J. Ferguson
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | - Robert McDonald
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | - Martin Cowie
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, AB T6G 2G2, Canada
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Wang T, Keyes L, Patrick BO, Love JA. Exploration of the Mechanism of Platinum(II)-Catalyzed C–F Activation: Characterization and Reactivity of Platinum(IV) Fluoroaryl Complexes Relevant to Catalysis. Organometallics 2012. [DOI: 10.1021/om2007562] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tongen Wang
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, British
Columbia, V6T 1Z1
| | - Lauren Keyes
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, British
Columbia, V6T 1Z1
| | - Brian O. Patrick
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, British
Columbia, V6T 1Z1
| | - Jennifer A. Love
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, British
Columbia, V6T 1Z1
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Braunschweig H, Ye Q, Damme A, Kupfer T, Radacki K, Wolf J. Synthesis of 1-Aza-2-borabutatriene Rhodium Complexes by Thermal Borylene Transfer from [(OC)5MoBN(SiMe3)2]. Angew Chem Int Ed Engl 2011; 50:9462-6. [DOI: 10.1002/anie.201104026] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2011] [Indexed: 11/08/2022]
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11
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Braunschweig H, Ye Q, Damme A, Kupfer T, Radacki K, Wolf J. Synthese von 1-Aza-2-borabutatrien-Rhodiumkomplexen durch thermischen Borylentransfer von [(OC)5MoBN(SiMe3)2]. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Keyes L, Sun AD, Love JA. Exploration of the Scope of Pt-Catalyzed C-F Activation. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100478] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Beltrán TF, Feliz M, Llusar R, Mata JA, Safont. VS. Mechanism of the Catalytic Hydrodefluorination of Pentafluoropyridine by Group Six Triangular Cluster Hydrides Containing Phosphines: A Combined Experimental and Theoretical Study. Organometallics 2010. [DOI: 10.1021/om1009878] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tomás F. Beltrán
- Departament de Química Física i Analítica, Universitat Jaume I, Avenida Sos Baynat s/n, 12071 Castelló, Spain
| | - Marta Feliz
- Departament de Química Física i Analítica, Universitat Jaume I, Avenida Sos Baynat s/n, 12071 Castelló, Spain
| | - Rosa Llusar
- Departament de Química Física i Analítica, Universitat Jaume I, Avenida Sos Baynat s/n, 12071 Castelló, Spain
| | - Jose A. Mata
- Departament de Química Inorgànica i Orgànica, Universitat Jaume I, Avenida Sos Baynat s/n, 12071 Castelló, Spain
| | - Vicent S. Safont.
- Departament de Química Física i Analítica, Universitat Jaume I, Avenida Sos Baynat s/n, 12071 Castelló, Spain
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14
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Hughes RP. Fluorine as a ligand substituent in organometallic chemistry: A second chance and a second research career. J Fluor Chem 2010. [DOI: 10.1016/j.jfluchem.2010.06.014] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Slaney ME, Anderson DJ, Ferguson MJ, McDonald R, Cowie M. The Bridged Binding Mode as a New, Versatile Template for the Selective Activation of Carbon−Fluorine Bonds in Fluoroolefins: Activation of Trifluoroethylene. J Am Chem Soc 2010; 132:16544-58. [DOI: 10.1021/ja106723u] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael E. Slaney
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - D. Jason Anderson
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Michael J. Ferguson
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Robert McDonald
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Martin Cowie
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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17
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Suzuki N, Hashizume D. Five-membered metallacycloalkynes formed from group 4 metals and [n]cumulene (n=3,5) ligands. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.12.016] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Teltewskoi M, Panetier J, Macgregor S, Braun T. A Highly Reactive Rhodium(I)-Boryl Complex as a Useful Tool for CH Bond Activation and Catalytic CF Bond Borylation. Angew Chem Int Ed Engl 2010; 49:3947-51. [DOI: 10.1002/anie.201001070] [Citation(s) in RCA: 156] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Teltewskoi M, Panetier J, Macgregor S, Braun T. A Highly Reactive Rhodium(I)-Boryl Complex as a Useful Tool for CH Bond Activation and Catalytic CF Bond Borylation. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201001070] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
The geometries of 19 different partially fluorinated butatrienes and their related butenyne isomers have been calculated at the Møller-Plesset second order perturbation theory level with Dunning's valence triple-zeta basis set. Final energies were determined at the CCSD(T)/cc-pVQZ level of theory. Increasing fluorine substitution has only a limited effect on the bond lengths but a substantial effect on the angles. The CCC bond angles of 4 of the 5 partially fluorinated butatrienes show a deviation of more than 2 degrees from collinearity, therefore representing angle-strained butatrienes. Increasing degree of fluorination has a substantial effect on the isomerization energies. The energy difference between the least stable enyne nonfluorinated at the acetylenic center and the most stable enyne fluorinated at the acetylenic center decreases from 66.8 kJ/mol, in case of the monofluorinated system, to 29.7 kJ/mol in the triple fluorinated system. The acetylenic F substitution is crucial in raising the energies of fluorinated but-1-en-3-yne relative to their butatriene isomers. Within the triple fluorinated system and unprecedented for all discussed molecules, 1,1,4-trifluoro-but-1-en-3-yne represents the only molecule fluorinated at the acetylenic center that is more stable than its triene isomer.
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Affiliation(s)
- Christian Ehm
- Institut für Chemie und Biochemie, Abt. Anorganische Chemie, Freie Universität Berlin, 14195 Berlin, Germany
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Kühnel MF, Lentz D. Fluorinated dienes in transition-metal chemistry – the rich chemistry of electron-poor ligands. Dalton Trans 2010; 39:9745-59. [DOI: 10.1039/c0dt00097c] [Citation(s) in RCA: 16] [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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22
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Braun T, Salomon MA, Altenhöner K, Teltewskoi M, Hinze S. C-F activation at rhodium boryl complexes: formation of 2-fluoroalkyl-1,3,2-dioxaborolanes by catalytic functionalization of hexafluoropropene. Angew Chem Int Ed Engl 2009; 48:1818-22. [PMID: 19180624 DOI: 10.1002/anie.200805041] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Fluorinated building blocks by C-F bond cleavage: Catalytic C-F activation reactions that give novel dioxaborolanes have been developed (see scheme). The reactions proceed at room temperature, and catalytic intermediates are presumably rhodium hydride and boryl species.
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Affiliation(s)
- Thomas Braun
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany.
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Braun T, Ahijado Salomon M, Altenhöner K, Teltewskoi M, Hinze S. CF Activation at Rhodium Boryl Complexes: Formation of 2-Fluoroalkyl-1,3,2-Dioxaborolanes by Catalytic Functionalization of Hexafluoropropene. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200805041] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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24
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Vicente J, Gil-Rubio J, Guerrero-Leal J, Bautista D. Synthesis of rhodium(i) and rhodium(iii) perfluoroalkyl complexes from [Rh(μ-OH)(COD)]2. Dalton Trans 2009:3854-66. [DOI: 10.1039/b822738a] [Citation(s) in RCA: 17] [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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25
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Gong L, Lin Y, Wen TB, Zhang H, Zeng B, Xia H. Formation of Four Conjugated Osmacyclic Species in a One-Pot Reaction. Organometallics 2008. [DOI: 10.1021/om8001558] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Lei Gong
- Department of Chemistry, College of Chemistry and Chemical Engineering, and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, People's Republic of China
| | - Yumei Lin
- Department of Chemistry, College of Chemistry and Chemical Engineering, and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, People's Republic of China
| | - Ting Bin Wen
- Department of Chemistry, College of Chemistry and Chemical Engineering, and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, People's Republic of China
| | - Hong Zhang
- Department of Chemistry, College of Chemistry and Chemical Engineering, and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, People's Republic of China
| | - Birong Zeng
- Department of Chemistry, College of Chemistry and Chemical Engineering, and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, People's Republic of China
| | - Haiping Xia
- Department of Chemistry, College of Chemistry and Chemical Engineering, and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, People's Republic of China
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The First Example of a Bis(trifluoromethyl)carbene Transition-Metal Complex and Its Reduction to a Perfluoroallene Complex. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200700814] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Braun T, Wehmeier F, Altenhöner K. Katalytische C-F-Aktivierung von Hexafluorpropen an Rhodium: Synthese von (3,3,3-Trifluorpropyl)silanen. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200700711] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Braun T, Wehmeier F, Altenhöner K. Catalytic CF Bond Activation of Hexafluoropropene by Rhodium: Formation of (3,3,3-Trifluoropropyl)silanes. Angew Chem Int Ed Engl 2007; 46:5321-4. [PMID: 17546716 DOI: 10.1002/anie.200700711] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Thomas Braun
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany.
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Akkerman FA, Lentz D. Stabilization of Tetrafluorobutatriene by Complex Formation. Angew Chem Int Ed Engl 2007; 46:4902-4. [PMID: 17514691 DOI: 10.1002/anie.200701081] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Floris A Akkerman
- Institut für Chemie und Biochemie, Anorganische und Analytische Chemie, Freie Universität Berlin, Fabeckstrasse 34/36, 14195 Berlin, Germany
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Akkerman F, Lentz D. Stabilisierung von Tetrafluorbutatrien durch Komplexbildung. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701081] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Braun T, Noveski D, Ahijado M, Wehmeier F. Hydrodefluorination of pentafluoropyridine at rhodium using dihydrogen: detection of unusual rhodium hydrido complexes. Dalton Trans 2007:3820-5. [PMID: 17712449 DOI: 10.1039/b706846h] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The pentafluoropyridyl complex [Rh(4-C5NF4)(PEt3)3] (3) reacts with H2 to give initially the dihydrido complex cis-mer-[Rh(H)2(4-C5NF4)(PEt3)3] (6). Within a few hours 2,3,5,6-tetrafluoropyridine as well as two rhodium(III) complexes mer-[Rh(H)3(PEt3)3] (mer-) and fac-[Rh(H)3(PEt3)3] (fac-) are formed. A catalytic C-F activation process for the formation of 2,3,5,6-tetrafluoropyridine starting from pentafluoropyridine and dihydrogen using 3 as a catalyst has been developed. Reaction of [RhH(PEt3)3] (1) with hydrogen affords fac-[Rh(H)3(PEt3)3] (fac-7) and mer-[Rh(H)3(PEt3)3] (mer-7) in a ratio of 1 : 7.25 at 193 K. The latter complex represents the first mononuclear rhodium compound bearing trans-hydrides.
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Affiliation(s)
- Thomas Braun
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489 Berlin, Germany.
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Braun T, Izundu J, Steffen A, Neumann B, Stammler HG. Reactivity of a palladium fluoro complex towards silanes and Bu3SnCHCH2: catalytic derivatisation of pentafluoropyridine based on carbon–fluorine bond activation reactions. Dalton Trans 2006:5118-23. [PMID: 17077884 DOI: 10.1039/b608410a] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chloro and azido complexes trans-[PdCl(4-C5NF4)(PiPr3)2] (3) and trans-[Pd(N3)(4-C5NF4)(PiPr3)2] (4) can be prepared by reaction of [PdF(4-C5NF4)(PiPr3)2] (2) with Et3SiCl or MeSiN3, respectively. In contrast, reactions of 2 with Ph3SiH or Me2FSiSiFMe2 give the products of reductive elimination 2,3,5,6-tetrafluoropyridine (5) or 4-(fluorodimethylsilyl)tetrafluoropyridine (6) as well as [Pd(PiPr3)2] (1). In a catalytic experiment, pentafluoropyridine can be converted with Ph3SiH into 5 in 62% yield, when 10% of 2 is employed as catalyst. Treatment of trans-[PdF(4-C5NF4)(PiPr3)2] (2) with Bu3SnCH=CH2 in THF at 50 degrees C results in the formation of [Pd(PiPr3)2] (1) and 4-vinyltetrafluoropyridine (7). Complex 2 is also active as a catalyst towards a Stille cross-coupling reaction of pentafluoropyridine with Bu3SnCH=CH2 to give 4-vinyltetrafluoropyridine (7) with a TON of 6. The molecular structure of the complex 3 has been determined by X-ray crystallography.
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Affiliation(s)
- Thomas Braun
- Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany.
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Steffen A, Sladek MI, Braun T, Neumann B, Stammler HG. Catalytic C−C Coupling Reactions at Nickel by C−F Activation of a Pyrimidine in the Presence of a C−Cl Bond: The Crucial Role of Highly Reactive Fluoro Complexes. Organometallics 2005. [DOI: 10.1021/om050080l] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andreas Steffen
- Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
| | - Marianna I. Sladek
- Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
| | - Thomas Braun
- Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
| | - Beate Neumann
- Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
| | - Hans-Georg Stammler
- Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
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Burling S, Elliott PIP, Jasim NA, Lindup RJ, McKenna J, Perutz RN, Archibald SJ, Whitwood AC. C–F Bond activation at Ni(0) and simple reactions of square planar Ni(ii) fluoride complexes. Dalton Trans 2005:3686-95. [PMID: 16258621 DOI: 10.1039/b510052f] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of Ni(COD)(2)(COD = 1,5-cyclooctadiene) with triethylphosphine and pentafluoropyridine in hexane has been shown previously to yield trans-[NiF(2-C(5)NF(4))(PEt(3))(2)](1a) with a preference for reaction at the 2-position of the heteroaromatic. The corresponding reaction with 2,3,5,6-tetrafluoropyridine was shown to yield trans-[NiF(2-C(5)NF(3)H)(PEt(3))(2)](1b). In this paper, we show that reaction of Ni(COD)(2) with triethylphosphine and pentafluoropyridine in THF yields a mixture of 1a and 1b. Competition reactions of Ni(COD)(2) with triethylphosphine in the presence of mixtures of heteroaromatics in hexane reveal a kinetic preference of k(pentafluoropyridine):k(2,3,5,6-tetrafluoropyridine)= 5.4:1. Treatment of 1a and 1b with Me(3)SiN(3) affords trans-[Ni(N(3))(2-C(5)NF(4))(PEt(3))(2)](2a) and trans-[Ni(N(3))(2-C(5)NHF(3))(PEt(3))(2)](2b), respectively. The complex trans-[Ni(NCO)(2-C(5)NHF(3))(PEt(3))(2)](3b) is obtained on reaction of with Me(3)SiNCO and by photolysis of under CO, while trans-[Ni(eta(1)-C [triple bond CPh)(2-C(5)NF(4))(PEt(3))(2)](4a) is obtained by reaction of phenylacetylene with 1a. Addition of KCN, KI and NaOAc to complex 1a affords trans-[Ni(X)(2-C(5)NF(4))(PEt(3))(2)](5a X = CN, 6a X = I, 7a X = OAc), respectively. The PEt(3) groups of complex are readily replaced by addition of 1,2-bis(dicyclohexylphosphino)ethane (dcpe) to produce [NiF(2-C(5)F(4)N)(dcpe)](8a). Addition of dcpe to trans-[Ni(OTf)(2-C(5)F(4)N)(PEt(3))(2)](10a), however, yields the salt [Ni(2-C(5)F(4)N)(dcpe)(PEt(3))](OTf)(9a) by substitution of only one PEt(3) and displacement of the triflate ligand. The structures of 2b, 4a, 7a and 8a were determined by X-ray crystallography. The influence of different ancillary ligands on the bond lengths and angles of square-planar nickel structures with polyfluoropyridyl ligands is analysed.
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Affiliation(s)
- Suzanne Burling
- Department of Chemistry, University of York, Heslington, York, UK
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Noveski D, Braun T, Neumann B, Stammler A, Stammler HG. C–F or C–H bond activation and C–C coupling reactions of fluorinated pyridines at rhodium: synthesis, structure and reactivity of a variety of tetrafluoropyridyl complexes. Dalton Trans 2004:4106-19. [PMID: 15573161 DOI: 10.1039/b414734k] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of [RhH(PEt3)3] (1) or [RhH(PEt3)4] (2) with pentafluoropyridine or 2,3,5,6-tetrafluoropyridine afford the activation product [Rh(4-C5NF4)(PEt3)3] (3). Treatment of 3 with CO, 13CO or CNtBu effects the formation of trans-[Rh(4-C5NF4)(CO)(PEt3)2] (4a), trans-[Rh(4-C5NF4)(13CO)(PEt3)2] (4b) and trans-[Rh(4-C5NF4)(CNtBu)(PEt3)2] (5). The rhodium(III) compounds trans-[RhI(CH3)(4-C5NF4)(PEt3)2] (6a) and trans-[RhI(13CH3)(4-C5NF4)(PEt3)2] (6b) are accessible on reaction of 3 with CH3I or 13CH3I. In the presence of CO or 13CO these complexes convert into trans-[RhI(CH3)(4-C5NF4)(CO)(PEt3)2] (7a), trans-[RhI(13CH3)(4-C5NF4)(CO)(PEt3)2] (7b) and trans-[RhI(13CH3)(4-C5NF4)(13CO)(PEt3)2] (7c). The trans arrangement of the carbonyl and methyl ligand in 7a-7c has been confirmed by the 13C-13C coupling constant in the 13C NMR spectrum of 7c. A reaction of 4a or 4b with CH3I or 13CH3I yields the acyl compounds trans-[RhI(COCH3)(4-C5NF4)(PEt3)2] (8a) and trans-[RhI(13CO13CH3)(4-C5NF4)(PEt3)2] (8b), respectively. Complex 8a slowly reacts with more CH3I to give [PEt3Me][Rh(I)2(COCH3)(4-C5NF4)(PEt3)](9). On heating a solution of 7a, the complex trans-[RhI(CO)(PEt3)2] (10) and the C-C coupled product 4-methyltetrafluoropyridine (11) have been obtained. Complex 8a also forms 10 at elevated temperatures in the presence of CO together with the new ketone 4-acetyltetrafluoropyridine (12). The structures of the complexes 3, 4a, 5, 6a, 8a and 9 have been determined by X-ray crystallography. 19F-1H HMQC NMR solution spectra of 6a and 8a reveal a close contact of the methyl groups in the phosphine to the methyl or acyl ligand bound at rhodium.
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Affiliation(s)
- Daniel Noveski
- Fakultät fur Chemie, Universität Bielefeld, Postfach 100131, 33501, Bielefeld, Germany
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