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1
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Bai W, Tsang LY, Wang Y, Li Y, Sung HHY, Williams ID, Jia G. Synthesis and characterization of bi(metallacycloprop-1-ene) complexes. Chem Sci 2022; 14:96-102. [PMID: 36605739 PMCID: PMC9769101 DOI: 10.1039/d2sc05378k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 11/15/2022] [Indexed: 11/18/2022] Open
Abstract
In all previously reported metallacycloprop-1-ene or η2-vinyl complexes, the metal center bears only one vinyl moiety. We have now successfully synthesized and structurally characterized the first complexes bearing two η2-vinyl moieties or spiro bi(metallacycloprop-1-ene) complexes from reactions of alkynes with rhenium phosphine complexes. Computational studies indicate that the metallacycloprop-1-ene rings are aromatic and the complexes represent a rare σ-type spirometalla-aromatic system.
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Affiliation(s)
- Wei Bai
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China,State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of TechnologyLiaoning 116024P. R. China
| | - Long Yiu Tsang
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
| | - Yilun Wang
- State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of TechnologyLiaoning 116024P. R. China,School of Chemical Engineering, Dalian University of TechnologyPanjinLiaoning 124221P. R. China
| | - Yang Li
- State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of TechnologyLiaoning 116024P. R. China,School of Chemical Engineering, Dalian University of TechnologyPanjinLiaoning 124221P. R. China
| | - Herman H. Y. Sung
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
| | - Ian D. Williams
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
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2
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Wei W, Xu X, Lee KH, Lin R, Sung HHY, Williams ID, Lin Z, Jia G. Reactions of Rhenacyclobutadiene Complexes with Allenes. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00493] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Wei
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
| | - Xin Xu
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
| | - Ka-Ho Lee
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
| | - Ran Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
| | - Herman H. Y. Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
| | - Ian D. Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 0000, People’s Republic of China
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3
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Zhang L, Hou G, Zi G, Ding W, Walter MD. Influence of the 5f Orbitals on the Bonding and Reactivity in Organoactinides: Experimental and Computational Studies on a Uranium Metallacyclopropene. J Am Chem Soc 2016; 138:5130-42. [PMID: 27070508 DOI: 10.1021/jacs.6b01391] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis, structure, and reactivity of a uranium metallacyclopropene were comprehensively studied. Reduction of (η(5)-C5Me5)2UCl2 (1) with potassium graphite (KC8) in the presence of bis(trimethylsilyl)acetylene (Me3SiC≡CSiMe3) allows the first stable uranium metallacyclopropene (η(5)-C5Me5)2U[η(2)-C2(SiMe3)2] (2) to be isolated. Magnetic susceptibility data confirm that 2 is a U(IV) complex, and density functional theory (DFT) studies indicate substantial 5f orbital contributions to the bonding of the metallacyclopropene U-(η(2)-C═C) moiety, leading to more covalent bonds between the (η(5)-C5Me5)2U(2+) and [η(2)-C2(SiMe3)2](2-) fragments than those in the related Th(IV) compound. Consequently, very different reactivity patterns emerge, e.g., 2 can act as a source for the (η(5)-C5Me5)2U(II) fragment when reacted with alkynes and a variety of heterounsaturated molecules such as imines, bipy, carbodiimide, organic azides, hydrazine, and azo derivatives.
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Affiliation(s)
- Lei Zhang
- Department of Chemistry, Beijing Normal University , Beijing 100875, China
| | - Guohua Hou
- Department of Chemistry, Beijing Normal University , Beijing 100875, China
| | - Guofu Zi
- Department of Chemistry, Beijing Normal University , Beijing 100875, China
| | - Wanjian Ding
- Department of Chemistry, Beijing Normal University , Beijing 100875, China
| | - Marc D Walter
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig , Hagenring 30, 38106 Braunschweig, Germany
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4
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Fang B, Ren W, Hou G, Zi G, Fang DC, Maron L, Walter MD. An Actinide Metallacyclopropene Complex: Synthesis, Structure, Reactivity, and Computational Studies. J Am Chem Soc 2014; 136:17249-61. [DOI: 10.1021/ja509770t] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Bo Fang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Wenshan Ren
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guohua Hou
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guofu Zi
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - De-Cai Fang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Laurent Maron
- LPCNO,
CNRS and INSA, Université Paul Sabatier, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Marc D. Walter
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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5
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Soriano E, Fernández I. Allenes and computational chemistry: from bonding situations to reaction mechanisms. Chem Soc Rev 2014; 43:3041-105. [DOI: 10.1039/c3cs60457h] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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6
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Castro-Rodrigo R, Esteruelas MA, López AM, Mozo S, Oñate E. C−H Bond Activation Reactions in π-Allene−Osmium−Triisopropylphosphine Complexes with Cyclopentadienyl or Hydridotris(pyrazolyl)borate Ligands: Formation of Isopropenyldiisopropylphosphine versus Hydride−Alkenylcarbyne Derivatives. Organometallics 2010. [DOI: 10.1021/om100568r] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Ruth Castro-Rodrigo
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Miguel A. Esteruelas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Ana M. López
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Silvia Mozo
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
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7
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Collado A, Esteruelas MA, López F, Mascareñas JL, Oñate E, Trillo B. C−H Bond Activation of Terminal Allenes: Formation of Hydride-Alkenylcarbyne-Osmium and Disubstituted Vinylidene-Ruthenium Derivatives. Organometallics 2010. [DOI: 10.1021/om100192t] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alba Collado
- Departamento de Química
Inorgánica, Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Miguel A. Esteruelas
- Departamento de Química
Inorgánica, Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Fernando López
- Instituto de Química Orgánica General-CSIC, Juan de la Cierva 3, 28006, Madrid, Spain
| | - José L. Mascareñas
- Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Enrique Oñate
- Departamento de Química
Inorgánica, Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Beatriz Trillo
- Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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8
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9
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Esteruelas MA, Hernández YA, López AM, Oñate E. Preparation and Characterization of a Monocyclopentadienyl Osmium−Allenylcarbene Complex. Organometallics 2007. [DOI: 10.1021/om700722e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Miguel A. Esteruelas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Yohar A. Hernández
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Ana M. López
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
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10
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Stone KC, Jamison GM, White PS, Templeton JL. Sequential Chemical Transformations of a Tungsten Carbyne Ligand: Protonation, Alkyne Insertion, Vinylcarbene Formation, and Metallacyclopropene/Metallafuran Isomerization. Organometallics 2003. [DOI: 10.1021/om0303000] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kenneth C. Stone
- W. R. Kenan, Jr. Laboratory, Department of Chemistry, The University of North Carolina, Chapel Hill, North Carolina 27599-3290
| | - Gregory M. Jamison
- W. R. Kenan, Jr. Laboratory, Department of Chemistry, The University of North Carolina, Chapel Hill, North Carolina 27599-3290
| | - Peter S. White
- W. R. Kenan, Jr. Laboratory, Department of Chemistry, The University of North Carolina, Chapel Hill, North Carolina 27599-3290
| | - Joseph L. Templeton
- W. R. Kenan, Jr. Laboratory, Department of Chemistry, The University of North Carolina, Chapel Hill, North Carolina 27599-3290
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11
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Casey CP, Boller TM, Kraft S, Guzei IA. Structural isomers of aryl-substituted eta(3)-propargyl complexes: eta(2)-1-Metalla(methylene)cyclopropene and eta(3)-benzyl complexes. J Am Chem Soc 2002; 124:13215-21. [PMID: 12405850 DOI: 10.1021/ja020439m] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Hydride abstraction from C(5)Me(5)(CO)(2)Re(eta(2)-PhC triple bond CCH(2)Ph) (1) gave a 3:1 mixture of eta(3)-propargyl complex [C(5)Me(5)(CO)(2)Re(eta(3)-PhCH-C triple bond CPh)][BF(4)] (5) and eta(2)-1-metalla(methylene)cyclopropene complex [C(5)Me(5)(CO)(2)Re(eta(2)-PhC-C=CHPh)][BF(4)] (6). Observation of the eta(2)-isomer requires 1,3-diaryl substitution and is favored by electron-donating substituents on the C(3)-aryl ring. Interconversion of eta(3)-propargyl and eta(2)-1-metalla(methylene)cyclopropene complexes is very rapid and results in coalescence of Cp (1)H NMR resonances at about -50 degrees C. Protonation of the alkynyl carbene complex C(5)Me(5)(CO)(2)Re=C(Ph)C triple bond CPh (22) gave a third isomer, the eta(3)-benzyl complex [C(5)Me(5)(CO)(2)Re[eta(3)(alpha,1,2)-endo,syn-C(6)H(5)CH(C triple bond CC(6)H(5))]][BF(4)] (23) along with small amounts of the isomeric complexes 5 and 6. While 5 and 6 are in rapid equilibrium, there is no equilibration of the eta(3)-benzyl isomer 23 with 5 and 6.
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Affiliation(s)
- Charles P Casey
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.
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12
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Herndon JW. The chemistry of the carbontransition metal double and triple bond: annual survey covering the year 2000. Coord Chem Rev 2002. [DOI: 10.1016/s0010-8545(01)00445-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Carbó JJ, Crochet P, Esteruelas MA, Jean Y, Lledós A, López AM, Oñate E. Two- and Four-Electron Alkyne Ligands in Osmium−Cyclopentadienyl Chemistry: Consequences of the π⊥→M Interaction. Organometallics 2001. [DOI: 10.1021/om010645n] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jorge J. Carbó
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón-Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain, and Laboratoire de Chimie Physique, UMR 8000, Bâtiment 490, Université de Paris-Sud, 91405 Orsay Cedex, France
| | - Pascale Crochet
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón-Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain, and Laboratoire de Chimie Physique, UMR 8000, Bâtiment 490, Université de Paris-Sud, 91405 Orsay Cedex, France
| | - Miguel A. Esteruelas
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón-Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain, and Laboratoire de Chimie Physique, UMR 8000, Bâtiment 490, Université de Paris-Sud, 91405 Orsay Cedex, France
| | - Yves Jean
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón-Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain, and Laboratoire de Chimie Physique, UMR 8000, Bâtiment 490, Université de Paris-Sud, 91405 Orsay Cedex, France
| | - Agustí Lledós
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón-Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain, and Laboratoire de Chimie Physique, UMR 8000, Bâtiment 490, Université de Paris-Sud, 91405 Orsay Cedex, France
| | - Ana M. López
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón-Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain, and Laboratoire de Chimie Physique, UMR 8000, Bâtiment 490, Université de Paris-Sud, 91405 Orsay Cedex, France
| | - Enrique Oñate
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón-Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain, and Laboratoire de Chimie Physique, UMR 8000, Bâtiment 490, Université de Paris-Sud, 91405 Orsay Cedex, France
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Guillemot G, Solari E, Scopelliti R, Floriani C. Molybdenum(IV)-d2 Reactivity in a Quasiplanar Oxo-Environment Modeled by Calix[4]arene: The Reductive Cleavage of NN Double Bond and the Formation of 1-Metallacyclopropene from the Corresponding Alkyne Complexes. Organometallics 2001. [DOI: 10.1021/om010156n] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Geoffroy Guillemot
- Institut de Chimie Minérale et Analytique, BCH, Université de Lausanne, CH-1015 Lausanne, Switzerland
| | - Euro Solari
- Institut de Chimie Minérale et Analytique, BCH, Université de Lausanne, CH-1015 Lausanne, Switzerland
| | - Rosario Scopelliti
- Institut de Chimie Minérale et Analytique, BCH, Université de Lausanne, CH-1015 Lausanne, Switzerland
| | - Carlo Floriani
- Institut de Chimie Minérale et Analytique, BCH, Université de Lausanne, CH-1015 Lausanne, Switzerland
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15
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Floriani C, Floriani-Moro R. The MC bond functionalities bonded to an oxo-surface modeled by Calix[4]arenes. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2001. [DOI: 10.1016/s0065-3055(01)47012-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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16
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Sadimenko AP. Organometallic Complexes of Pyrazolylborates and Related Ligands. ADVANCES IN HETEROCYCLIC CHEMISTRY 2001. [DOI: 10.1016/s0065-2725(01)81012-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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17
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Tsai YC, Diaconescu PL, Cummins CC. Facile Synthesis of Trialkoxymolybdenum(VI) Alkylidyne Complexes for Alkyne Metathesis. Organometallics 2000. [DOI: 10.1021/om000644f] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yi-Chou Tsai
- Department of Chemistry, Room 2-227, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
| | - Paula L. Diaconescu
- Department of Chemistry, Room 2-227, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
| | - Christopher C. Cummins
- Department of Chemistry, Room 2-227, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
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18
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Guillemot G, Solari E, Floriani C, Nazzareno ReCorrado Rizzoli. Alkene and Alkyne Reactivity over a Metal−Oxo Surface Modeled by Calix[4]arene−Tungsten(IV): Formation of 1-Metallacyclopropene and Alkylidene Complexes. Organometallics 2000. [DOI: 10.1021/om0006155] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Geoffroy Guillemot
- Institut de Chimie Minérale et Analytique, BCH, Université de Lausanne, CH-1015 Lausanne, Switzerland
| | - Euro Solari
- Institut de Chimie Minérale et Analytique, BCH, Université de Lausanne, CH-1015 Lausanne, Switzerland
| | - Carlo Floriani
- Institut de Chimie Minérale et Analytique, BCH, Université de Lausanne, CH-1015 Lausanne, Switzerland
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19
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Frohnapfel DS, White PS, Templeton JL. Insertion Products from Photolysis of Tp‘(CO)3WH and Alkynes. Organometallics 2000. [DOI: 10.1021/om9910165] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David S. Frohnapfel
- W. R. Kenan Laboratory, Department of Chemistry, The University of North Carolina, Chapel Hill, North Carolina 27514
| | - Peter S. White
- W. R. Kenan Laboratory, Department of Chemistry, The University of North Carolina, Chapel Hill, North Carolina 27514
| | - Joseph L. Templeton
- W. R. Kenan Laboratory, Department of Chemistry, The University of North Carolina, Chapel Hill, North Carolina 27514
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