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Investigation of relative stabilities of CPAM zirconium cycloalkylmethyl vs isomeric ω-alkenyl complexes: Crystal structures of the cyclobutylmethyl and cyclopentylmethyl complexes. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Mahato S, Nandy S, Das KK, Panda S. Zirconium Promoted Synthetic Transformations of Organoboron Compounds. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Somenath Mahato
- IIT Kharagpur: Indian Institute of Technology Kharagpur chemistry INDIA
| | - Soumilee Nandy
- IIT Kharagpur: Indian Institute of Technology Kharagpur chemistry INDIA
| | - Kanak Kanti Das
- IIT Kharagpur: Indian Institute of Technology Kharagpur chemistry INDIA
| | - Santanu Panda
- Indian Institute of Technology Kharagpur Department of Chemistry Chemistry IIT Kharagpur, Organic chemistry building, OC-207Near Rubber technology department 721302 Kharagpur INDIA
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Lerayer E, Renaut P, Brandès S, Cattey H, Fleurat-Lessard P, Bouhadir G, Bourissou D, Hierso JC. Planar-Chiral 1,1'-Diboryl Metallocenes: Diastereoselective Synthesis from Boryl Cyclopentadienides and Spin Density Analysis of a Diborylcobaltocene. Inorg Chem 2017; 56:1966-1973. [PMID: 28139922 DOI: 10.1021/acs.inorgchem.6b02510] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of nonsubstituted alkali metal cyclopentadienides with haloboranes leads to ∼90:10 mixtures of isomeric diene products that can be deprotonated to give simple boryl cyclopentadienides. We extended this transformation to the sterically hindered lithium tert-butylcyclopentadienide 1 using FBMes2 (Mes = 2,4,6-trimethylphenyl) and ClBCy2 as electrophiles. The boryl group is selectively introduced in the remote position to minimize steric congestion. The new boryl dienes are obtained as mixtures of isomers, and subsequent deprotonation with MeLi or LiHMDS affords the lithium 1,3-disubstituted cyclopentadienides 5a,b in yields over 95%. Direct assembling of tert-butylated boryl cyclopentadienides with MCl2 (M = Fe, Co) selectively leads to 1,1'-planar chiral ferrocenes 6a,b and cobaltocene 7. To shed light into the diastereoselective formation of 6a, DFT calculations were performed. The potential energy surface was scrutinized so as to identify and compare its diastereoisomers and conformers. This stereoselectivity is attributed to minimized steric repulsions between the tert-butyl and the BMes2 groups in the eclipsed conformation of the racemic diastereoisomers. The X-ray structures of boryl diene 2a and diboryl ferrocene 6a are reported. The electronic structure of cobaltocene 7 was analyzed by EPR and DFT calculations. The spin density of this unique open-shell complex is mainly localized on the Co center, but significant spin density is also found on the boron atoms, indicating substantial delocalization of the unpaired electron over the Lewis acid moieties. Consistently, the singly occupied molecular orbital is a combination of a Co-centered 3d orbital with π(BC) orbitals on each CpBMes2 rings. There is only weak, if any, direct M···B interaction in 6 and 7.
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Affiliation(s)
- Emmanuel Lerayer
- Université de Bourgogne Franche-Comté , Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB UMR 6302 CNRS), 9 Avenue Alain Savary, 21078 Dijon, France
| | - Patrice Renaut
- Université de Bourgogne Franche-Comté , Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB UMR 6302 CNRS), 9 Avenue Alain Savary, 21078 Dijon, France
| | - Stéphane Brandès
- Université de Bourgogne Franche-Comté , Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB UMR 6302 CNRS), 9 Avenue Alain Savary, 21078 Dijon, France
| | - Hélène Cattey
- Université de Bourgogne Franche-Comté , Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB UMR 6302 CNRS), 9 Avenue Alain Savary, 21078 Dijon, France
| | - Paul Fleurat-Lessard
- Université de Bourgogne Franche-Comté , Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB UMR 6302 CNRS), 9 Avenue Alain Savary, 21078 Dijon, France
| | - Ghenwa Bouhadir
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA), Université Paul Sabatier/CNRS UMR 5069 , 118 Route de Narbonne, 31062 Toulouse, Cedex 09, France
| | - Didier Bourissou
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA), Université Paul Sabatier/CNRS UMR 5069 , 118 Route de Narbonne, 31062 Toulouse, Cedex 09, France
| | - Jean-Cyrille Hierso
- Université de Bourgogne Franche-Comté , Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB UMR 6302 CNRS), 9 Avenue Alain Savary, 21078 Dijon, France.,Institut Universitaire de France (IUF) , 103 Boulevard Saint Michel, 75005 Paris Cedex, France
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Bender G, Daniliuc CG, Wibbeling B, Kehr G, Erker G. Reaction of five-membered zirconacycloallenoids with the strong Lewis acid B(C6F5)3. Dalton Trans 2014; 43:12210-3. [DOI: 10.1039/c4dt01137f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Sircoglou M, Bouhadir G, Saffon N, Miqueu K, Bourissou D. A Zwitterionic Gold(I) Complex from an Ambiphilic Diphosphino−Alane Ligand. Organometallics 2008. [DOI: 10.1021/om800101s] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marie Sircoglou
- Laboratoire Hétérochimie Fondamentale et Appliquée UMR-CNRS 5069, Equipe “Ligands Bifonctionnels et Polymères Biodégradables”, 118 route de Narbonne, 31062 Toulouse cedex 9, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), 118 route de Narbonne, 31062 Toulouse cedex 9, France, and Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR-CNRS 5254, Equipe “Chimie-Physique”, Avenue de l’Université, BP 1155, 64013 Pau cedex, France
| | - Ghenwa Bouhadir
- Laboratoire Hétérochimie Fondamentale et Appliquée UMR-CNRS 5069, Equipe “Ligands Bifonctionnels et Polymères Biodégradables”, 118 route de Narbonne, 31062 Toulouse cedex 9, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), 118 route de Narbonne, 31062 Toulouse cedex 9, France, and Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR-CNRS 5254, Equipe “Chimie-Physique”, Avenue de l’Université, BP 1155, 64013 Pau cedex, France
| | - Nathalie Saffon
- Laboratoire Hétérochimie Fondamentale et Appliquée UMR-CNRS 5069, Equipe “Ligands Bifonctionnels et Polymères Biodégradables”, 118 route de Narbonne, 31062 Toulouse cedex 9, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), 118 route de Narbonne, 31062 Toulouse cedex 9, France, and Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR-CNRS 5254, Equipe “Chimie-Physique”, Avenue de l’Université, BP 1155, 64013 Pau cedex, France
| | - Karinne Miqueu
- Laboratoire Hétérochimie Fondamentale et Appliquée UMR-CNRS 5069, Equipe “Ligands Bifonctionnels et Polymères Biodégradables”, 118 route de Narbonne, 31062 Toulouse cedex 9, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), 118 route de Narbonne, 31062 Toulouse cedex 9, France, and Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR-CNRS 5254, Equipe “Chimie-Physique”, Avenue de l’Université, BP 1155, 64013 Pau cedex, France
| | - Didier Bourissou
- Laboratoire Hétérochimie Fondamentale et Appliquée UMR-CNRS 5069, Equipe “Ligands Bifonctionnels et Polymères Biodégradables”, 118 route de Narbonne, 31062 Toulouse cedex 9, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), 118 route de Narbonne, 31062 Toulouse cedex 9, France, and Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR-CNRS 5254, Equipe “Chimie-Physique”, Avenue de l’Université, BP 1155, 64013 Pau cedex, France
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Tam KH, Lo JC, Guo Z, Chan MC. Cyclometalated group 4 complexes supported by tridentate pyridine-2-phenolate-6-(σ-aryl) ligands: Catalysts for ethylene polymerization and comparisons with fluorinated analogues. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.05.040] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Motta A, Fragalà IL, Marks TJ. Stereochemical Control Mechanisms in Propylene Polymerization Mediated by C1-Symmetric CGC Titanium Catalyst Centers. J Am Chem Soc 2007; 129:7327-38. [PMID: 17511456 DOI: 10.1021/ja068990x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This work analyzes stereochemical aspects of olefin polymerization processes mediated by the C1-symmetric constrained geometry catalyst H2Si(ind)(tBuN)TiCH3+ (ind = indenyl), including the role of the cocatalyst/counteranion. The energetics of catalyst activation are first analyzed and shown to compare favorably with experiment. The energetics of heterolytic ion pair separation are next scrutinized, and the effects of solvation environment are assessed. Computed thermodynamic profiles for ethylene insertion at H2Si(ind)(tBuN)TiCH3+ indicate that the kinetics of insertion processes at the H2Si(ind)(tBuN)TiR+ cation can be analyzed in terms of SCF potential energies. We next compare the energetic profile for ethylene insertion at the naked H2Si(ind)(tBuN)TiCH3+ cation with that at the related H2Si(ind)(tBuN)TiCH3+H3CB(C6F5)3- ion pair to understand counterion effects. It is seen that the counterion, although affecting overall catalytic activity, does not significantly influence enchainment stereochemistry or polymer microtacticity. Next, the second ethylene insertion at H2Si(ind)(tBuN)Ti(nC3H7)+H3CB(C6F5)3- is analyzed to evaluate counteranion influence on the propagation barrier. It is found that the ethylene uptake transition state is energetically comparable to the first insertion transition state and that solvation has negligible effects on the energetic profile. These findings justify analysis of the propylene insertion process within the less computationally demanding "naked cation" model. Thus, monomer enchainment at H2Si(ind)(tBuN)TiR+ is analyzed for H2Si(ind)(tBuN)TiCH3+ + propylene (first insertion) and for H2Si(ind)(tBuN)Ti(iC4H6)+ + propylene (second insertion). Data describing the first insertion highlight the sterically dominated regioselection properties of the system with activation energies indicating that olefin insertion regiochemistry is predominantly 1,2 (primary), while the second insertion similarly reflects the catalyst stereoinduction properties, with steric effects introduced by the growing chain (mimicked by an isobutyl group) preferentially favoring insertion pathways that afford isotactic enrichment, in agreement with experiment.
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Affiliation(s)
- Alessandro Motta
- Dipartimento di Scienze Chimiche, Università di Catania, and INSTM, UdR Catania, Viale A. Doria 6, 95125 Catania, Italy
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Hayes PG, Piers WE, Parvez M. Synthesis, Structure, and Ion Pair Dynamics of β-Diketiminato-Supported Organoscandium Contact Ion Pairs. Organometallics 2005. [DOI: 10.1021/om050007v] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul G. Hayes
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
| | - Warren E. Piers
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
| | - Masood Parvez
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
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Zwitterionic complexes arising from the reaction of tucked-in titanocenes with tris(pentafluorophenyl)borane. INORG CHEM COMMUN 2005. [DOI: 10.1016/j.inoche.2004.12.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Hannig F, Fröhlich R, Bergander K, Erker G, Petersen JL. Structural and Spectroscopic Evidence for Intramolecular Agostic M···H−C and Dative Zr←F−C(ortho) Interactions in the Zwitterionic Metal Complexes [(C5H4)SiMe2(N-t-Bu)]M(+)(μ-C4H6)B(−)(C6F5)3, M = Ti, Zr. Organometallics 2004. [DOI: 10.1021/om040057k] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Frithjof Hannig
- Organisch-Chemisches Institut der Universitat Münster, Corrensstrasse 40, D-48149 Münster, Germany, and C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Roland Fröhlich
- Organisch-Chemisches Institut der Universitat Münster, Corrensstrasse 40, D-48149 Münster, Germany, and C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Klaus Bergander
- Organisch-Chemisches Institut der Universitat Münster, Corrensstrasse 40, D-48149 Münster, Germany, and C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Gerhard Erker
- Organisch-Chemisches Institut der Universitat Münster, Corrensstrasse 40, D-48149 Münster, Germany, and C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Jeffrey L. Petersen
- Organisch-Chemisches Institut der Universitat Münster, Corrensstrasse 40, D-48149 Münster, Germany, and C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
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Lukešová L, Horáček M, Štěpnička P, Gyepes R, Cı́sařová I, Kubišta J, Mach K. Irregular cyclization reactions in titanocenes bearing pendant double bonds. J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2004.02.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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ERKER GERHARD, KEHR GERALD, FRÖHLICH ROLAND. The (Butadiene)zirconocenes and Related Compounds. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2004. [DOI: 10.1016/s0065-3055(03)51003-6] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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16
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Beetstra DJ, Meetsma A, Hessen B, Teuben JH. (Cyclopentadienylamine)scandium(2,3-dimethyl-1,3-butadiene): A 1,3-Diene Complex of Scandium with Sc(I)- and Sc(III)-like Reactivity. Organometallics 2003. [DOI: 10.1021/om030267h] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dirk J. Beetstra
- Dutch Polymer Institute/Center for Catalytic Olefin Polymerization, Stratingh Institute for Chemistry and Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Auke Meetsma
- Dutch Polymer Institute/Center for Catalytic Olefin Polymerization, Stratingh Institute for Chemistry and Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Bart Hessen
- Dutch Polymer Institute/Center for Catalytic Olefin Polymerization, Stratingh Institute for Chemistry and Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Jan H. Teuben
- Dutch Polymer Institute/Center for Catalytic Olefin Polymerization, Stratingh Institute for Chemistry and Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Burlakov V, Letov A, Arndt P, Baumann W, Spannenberg A, Fischer C, Strunkina L, Minacheva M, Vygodskii Y, Rosenthal U, Shur V. Zwitterionic titanoxanes {Cp[η5-C5H4B(C6F5)3]Ti}2O and {(η5-iPrC5H4)[η5-1,3-iPrC5H3B(C6F5)3]Ti}2O as catalysts for cationic ring-opening polymerization. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(03)00023-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Horáček M, Štěpnička P, Kubišta J, Cı́sařová I, Petrusová L, Mach K. Reduction-induced double bond coordination and multiple CH activation in fully-substituted titanocenes bearing a pendant double bond or an eight-membered hydrocarbyl ansa-chain. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(02)02162-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Erker G. The (butadiene)metal complex/B(C6F5)3pathway to homogeneous single component Ziegler–Natta catalyst systems. Chem Commun (Camb) 2003. [DOI: 10.1039/b208898n] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lanza G, Fragalà IL, Marks TJ. Energetic, Structural, and Dynamic Aspects of Ethylene Polymerization Mediated by Homogeneous Single-Site “Constrained Geometry Catalysts” in the Presence of Cocatalyst and Solvation: An Investigation at the ab Initio Quantum Chemical Level. Organometallics 2002. [DOI: 10.1021/om0207764] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giuseppe Lanza
- Dipartimento di Chimica, Università della Basilicata, 85100, Potenza, Italy, Dipartimento di Scienze Chimiche, Università di Catania, 95125 Catania, Italy, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113
| | - Ignazio L. Fragalà
- Dipartimento di Chimica, Università della Basilicata, 85100, Potenza, Italy, Dipartimento di Scienze Chimiche, Università di Catania, 95125 Catania, Italy, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113
| | - Tobin J. Marks
- Dipartimento di Chimica, Università della Basilicata, 85100, Potenza, Italy, Dipartimento di Scienze Chimiche, Università di Catania, 95125 Catania, Italy, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113
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Li L, Metz MV, Li H, Chen MC, Marks TJ, Liable-Sands L, Rheingold AL. Catalyst/cocatalyst nuclearity effects in single-site polymerization. Enhanced polyethylene branching and alpha-olefin comonomer enchainment in polymerizations mediated by binuclear catalysts and cocatalysts via a new enchainment pathway. J Am Chem Soc 2002; 124:12725-41. [PMID: 12392420 DOI: 10.1021/ja0201698] [Citation(s) in RCA: 142] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The binuclear "constrained geometry catalyst" (CGC) (mu-CH2CH2-3,3'){(eta5-indenyl )[1-Me2Si(tBuN)](ZrMe2)}2 [EBICGC(ZrMe2)2; Zr2] and the trityl bisborate dianion (Ph3C+)2[1,4-(C6F5)3BC6F4B(C6F5)3]2- (B2) have been synthesized to serve as new types of multicenter homogeneous olefin polymerization catalysts and cocatalysts, respectively. Additionally, the complex [1-Me2Si(3-ethylindenyl)(tBuN)]ZrMe2 (Zr1) was synthesized as a mononuclear control. For the bimetallic catalyst or bisborate cocatalyst, high effective local active site concentrations and catalyst center-catalyst center cooperative effects are evidenced by bringing the catalytic centers together via either covalent or electrostatic bonding. For ethylene homopolymerization at constant conversion, the branch content of the polyolefin products (primarily ethyl branches) is dramatically increased as catalyst or cocatalyst nuclearity is increased. Moreover, catalyst and cocatalyst nuclearity effects are approximately additive. Compared to the catalyst derived from monometallic Zr1 and monofunctional Ph3C+B(C6F5)4- (B1), the active catalyst derived from bimetallic Zr2 and bifunctional B2 produces approximately 11 times more ethyl branches in ethylene homopolymerization via a process which is predominantly intradimer in character. Moreover, approximately 3 times more 1-hexene incorporation in ethylene + 1-hexene copolymerization and approximately 4 times more 1-pentene incorporation in ethylene + 1-pentene copolymerization are observed for Zr2 + B2 versus Zr1 + B1.
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Affiliation(s)
- Liting Li
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA
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Lukešová L, Štěpnička P, Fejfarová K, Gyepes R, Císařová I, Horáček M, Kubišta J, Mach K. Reduction-Induced Cyclization and Redox Reactions of Fully Methylated Titanocene Dichlorides Bearing Pendant Alkenyldimethylsilyl Groups, [TiCl2{η5-C5Me4(SiMe2R)}2] (R = Vinyl and Allyl). Organometallics 2002. [DOI: 10.1021/om020150d] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lenka Lukešová
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Petr Štěpnička
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Karla Fejfarová
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Róbert Gyepes
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Ivana Císařová
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Michal Horáček
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Jiří Kubišta
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Karel Mach
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
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Casey CP, Carpenetti DW. Observation of non-chelated bis(pentamethylcyclopentadienyl)zirconium-alkyl–alkene complexes is thwarted by competitive arene or amine coordination or by β-hydride elimination. J Organomet Chem 2002. [DOI: 10.1016/s0022-328x(01)01217-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Interaction of half-sandwich alkylmolybdenum(III) complexes with B(C6F5)3. The X-ray structure of [CpMo(η4-C4H6)(μ-Cl)(μ-CH2)(O)MoCp][CH3B(C6F5)3]. J Organomet Chem 2001. [DOI: 10.1016/s0022-328x(01)01196-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Beringhelli T, Maggioni D, D'Alfonso G. 1H and 19F NMR Investigation of the Reaction of B(C6F5)3 with Water in Toluene Solution. Organometallics 2001. [DOI: 10.1021/om010610n] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tiziana Beringhelli
- Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Via Venezian 21, 20133 Milano, Italy
| | - Daniela Maggioni
- Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Via Venezian 21, 20133 Milano, Italy
| | - Giuseppe D'Alfonso
- Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Via Venezian 21, 20133 Milano, Italy
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26
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Lanza G, Fragalà IL, Marks TJ. Metal and Ancillary Ligand Structural Effects on Ethylene Insertion Processes at Cationic Group 4 Centers. A Systematic, Comparative Quantum Chemical Investigation at Various ab Initio Levels. Organometallics 2001. [DOI: 10.1021/om0102899] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Giuseppe Lanza
- Dipartimento di Chimica, Università della Basilicata, 85100, Potenza, Italy, Dipartimento di Scienze Chimiche, Università di Catania, 95125 Catania, Italy, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113
| | - Ignazio L. Fragalà
- Dipartimento di Chimica, Università della Basilicata, 85100, Potenza, Italy, Dipartimento di Scienze Chimiche, Università di Catania, 95125 Catania, Italy, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113
| | - Tobin J. Marks
- Dipartimento di Chimica, Università della Basilicata, 85100, Potenza, Italy, Dipartimento di Scienze Chimiche, Università di Catania, 95125 Catania, Italy, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113
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27
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Strauch JW, Petersen JL. Preparation and Structural Characterization of ansa-Mono(cyclopentadienyl)dimethylsilylamido Group 4 Metal Butadiene Complexes. Observation of a Tetranuclear Structure for [(C5H4)SiMe2(N-t-Bu)]Zr(C4H6) Featuring Bridging Butadiene Ligands. Organometallics 2001. [DOI: 10.1021/om001090j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joachim W. Strauch
- Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Jeffrey L. Petersen
- Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
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28
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Erker G. Homogeneous single-component betaine Ziegler-Natta catalysts derived from (butadiene)zirconocene precursors. Acc Chem Res 2001; 34:309-17. [PMID: 11308305 DOI: 10.1021/ar9800183] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(Butadiene)zirconocene adds B(C(6)F(5))(3) at a terminal diene carbon atom to yield the zirconocene-(mu-hydrocarbyl)-borate betaine Cp(2)Zr[C(4)H(6)-B(C(6)F(5))(3)] (4). The dipolar complex 4 contains a distorted pi-allyl moiety and features an additional stabilizing Zr-F-C(arene) coordination. Under kinetic control, an isomeric betaine system is formed, characterized by an internal Zr(+).CH(2)[B](-) ion-pair interaction, that rearranges to 4 upon heating. A great variety of ansa-metallocene(butadiene) complexes and related systems cleanly form analogous metallocene-(mu-conjugated diene)-borate betaines upon treatment with B(C(6)F(5))(3) and related Lewis acids. Most of these systems represent very active homogeneous single-component Ziegler-Natta catalysts for alpha-olefin polymerization and copolymerization. In addition, these betaine catalysts are ideally suited for carrying out mechanistic studies in active Ziegler-Natta catalyst systems. They allow for an experimental observation of the first alkene insertion step at the active single-component catalyst. This feature has been used for studying the mechanism of transfer of the stereochemical information from the bent metallocene backbone and for an experimental characterization of the energy profile of the alkene addition/alkene insertion reaction sequence in active homogeneous Ziegler-Natta systems. The neutral dipolar single-component catalysts (e.g., 4) produce a polyolefin-modified R'-(CHR-CH(2))-C(4)H(6)-B(C(6)F(5))(3)(-) counterion at the end of the initiation period upon entering into the repetitive active catalytic cycle.
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Affiliation(s)
- G Erker
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany.
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29
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Carpentier JF, Maryin VP, Luci J, Jordan RF. Solution structures and dynamic properties of chelated d(0) metal olefin complexes [eta(5): eta(1)-C(5)R(4)SiMe(2)N(t)Bu]Ti(OCMe(2)CH(2)CH(2)CH=CH(2))(+) (R = H, Me): Models for the [eta(5): eta(1)-C(5)R(4)SiMe(2)N(t)Bu]Ti(R')(olefin)(+) intermediates in "constrained geometry" catalysts. J Am Chem Soc 2001; 123:898-909. [PMID: 11456623 DOI: 10.1021/ja003209l] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To model the Ti-olefin interaction in the putative [eta(5): eta(1)-C(5)R(4)SiMe(2)N(t)Bu]Ti(R')(olefin)(+) intermediates in "constrained geometry" Ti-catalyzed olefin polymerization, chelated alkoxide olefin complexes [eta(5): eta(1)-C(5)R(4)SiMe(2)N(t)Bu]Ti(OCMe(2)CH(2)CH(2)CH=CH(2))(+) have been investigated. The reaction of [eta(5): eta(1)-C(5)R(4)SiMe(2)N(t)Bu]TiMe(2) (1a,b; R = H, Me) with HOCMe(2)CH(2)CH(2)CH=CH(2) yields mixtures of [eta(5)-C(5)R(4)SiMe(2)NH(t)Bu]TiMe(2)(OCMe(2)CH(2)CH(2)CH=CH(2)) (2a,b) and [eta(5): eta(1)-C(5)R(4)SiMe(2)N(t)Bu]TiMe(OCMe(2)CH(2)CH(2)CH=CH(2)) (3a,b). The reaction of 2a/3a and 2b/3b mixtures with B(C(6)F(5))(3) yields the chelated olefin complexes [[eta(5): eta(1)-C(5)R(4)SiMe(2)N(t)Bu]Ti(OCMe(2)CH(2)CH(2)CH=CH(2))][MeB(C(6)F(5))(3)] (4a,b; 71 and 89% NMR yield). The reaction of 2b/3b with [Ph(3)C][B(C(6)F(5))(4)] yields [[eta(5): eta(1)-C(5)Me(4)SiMe(2)N(t)Bu]Ti(OCMe(2)CH(2)CH(2)CH=CH(2))][B(C(6)F(5))(4)] (5b, 88% NMR yield). NMR studies establish that 4a,b and 5b exist as mixtures of diastereomers (isomer ratios: 4a/4a', 62/38; 4b/4b', 75/25; 5b/5b', 75/25), which differ in the enantioface of the olefin that is coordinated. NMR data for these d(0) metal olefin complexes show that the olefin coordinates to Ti in an unsymmetrical fashion primarily through C(term) such that the C=C pi bond is polarized with positive charge buildup on C(int). Dynamic NMR studies show that 4b/4b' undergoes olefin face exchange by a dissociative mechanism which is accompanied by fast inversion of configuration at Ti ("O-shift") in the olefin-dissociated intermediate. The activation parameters for the conversion of 4b to 4b' (i.e., 4b/4b' face exchange) are: DeltaH = 17.2(8) kcal/mol; DeltaS = 8(1) eu. 4a/4a' also undergoes olefin face exchange but with a lower barrier (DeltaH = 12.2(9) kcal/mol; DeltaS = -2(3) eu), for the conversion of 4a to 4a'.
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Affiliation(s)
- J F Carpentier
- Department of Chemistry, The University of Iowa, Iowa City, Iowa 52242, USA
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30
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Marx T, Wesemann L, Dehnen S. A Zwitterionic Transition-Metal Complex: Platinum−closo-Borate Coordination Synthesis, Structure, and DFT Calculations. Organometallics 2000. [DOI: 10.1021/om000456p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thiemo Marx
- Institut für Anorganische Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany, and Institut für Anorganische Chemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.45, D-76128 Karlsruhe, Germany
| | - Lars Wesemann
- Institut für Anorganische Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany, and Institut für Anorganische Chemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.45, D-76128 Karlsruhe, Germany
| | - Stefanie Dehnen
- Institut für Anorganische Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany, and Institut für Anorganische Chemie, Universität Karlsruhe, Engesserstrasse, Geb. 30.45, D-76128 Karlsruhe, Germany
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31
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Casey CP, Carpenetti DW. Measurement of Barriers for Alkene Dissociation and for Inversion at Zirconium in a d0 Zirconium−Alkyl−Alkene Complex. Organometallics 2000. [DOI: 10.1021/om9908940] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Charles P. Casey
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
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32
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Dahlmann M, Erker G, Bergander K. Experimental Characterization of the Alkene-Addition/-Insertion Energy Profile at Homogeneous Group 4 Metal Ziegler-Type Catalysts. J Am Chem Soc 2000. [DOI: 10.1021/ja0005338] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marc Dahlmann
- Contribution from the Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Gerhard Erker
- Contribution from the Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Klaus Bergander
- Contribution from the Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
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33
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Carpentier JF, Wu Z, Lee CW, Strömberg S, Christopher JN, Jordan RF. d0 Metal Olefin Complexes. Synthesis, Structures, and Dynamic Properties of (C5R5)2Zr(OCMe2CH2CH2CHCH2)+ Complexes: Models for the Elusive (C5R5)2Zr(R)(Olefin)+ Intermediates in Metallocene-Based Olefin Polymerization Catalysis. J Am Chem Soc 2000. [DOI: 10.1021/ja000989p] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-François Carpentier
- Contribution from the Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Zhe Wu
- Contribution from the Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Chul Woo Lee
- Contribution from the Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Staffan Strömberg
- Contribution from the Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Joseph N. Christopher
- Contribution from the Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Richard F. Jordan
- Contribution from the Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
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34
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Dahlmann M, Erker G, Fröhlich R, Meyer O. Structural Dichotomy in Single-Component Ziegler Catalyst Systems: Characterization of Zr···F and Zr···C-Bonded Structural Types of Group 4 Metallocene [C4H6−B(C6F5)3] Betaines. Organometallics 2000. [DOI: 10.1021/om0003741] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marc Dahlmann
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Oliver Meyer
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
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35
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Chen EY, Marks TJ. Cocatalysts for metal-catalyzed olefin polymerization: activators, activation processes, and structure-activity relationships. Chem Rev 2000; 100:1391-434. [PMID: 11749269 DOI: 10.1021/cr980462j] [Citation(s) in RCA: 1473] [Impact Index Per Article: 61.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- E Y Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113
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36
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Zirconocene Allyl Complexes: Dynamics in Solution, Reaction with Aluminum Alkyls, B(C6F5)3-Induced Propene Insertion, and Density-Functional Calculations on Possible Formation and Reaction Pathways. Organometallics 2000. [DOI: 10.1021/om9906058] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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37
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Shao P, Gendron RAL, Berg DJ, Bushnell GW. Dibenzylzirconium Complexes of Chelating Aminodiolates. Synthesis, Structural Studies, Thermal Stability, and Insertion Chemistry. Organometallics 2000. [DOI: 10.1021/om9907324] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pengcheng Shao
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
| | - Roland A. L. Gendron
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
| | - David J. Berg
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
| | - Gordon W. Bushnell
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3V6
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38
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Gielens EE, Dijkstra TW, Berno P, Meetsma A, Hessen B, Teuben JH. Stoichiometric olefin insertion into the TiC bond of four-coordinate cationic bis(phenolate) titanium aryl and benzyl complexes. J Organomet Chem 1999. [DOI: 10.1016/s0022-328x(99)00504-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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39
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Casey CP, Carpenetti DW, Sakurai H. Observation of Zwitterionic d0 Zirconium−Alkyl−Alkene Chelates: Models for Intermediates in Metallocene-Catalyzed Alkene Polymerizations. J Am Chem Soc 1999. [DOI: 10.1021/ja9919837] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Charles P. Casey
- Department of Chemistry, University of Wisconsin Madison, Wisconsin 53706
| | | | - Hidehiro Sakurai
- Department of Chemistry, University of Wisconsin Madison, Wisconsin 53706
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40
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Christian Strauch H, Erker G, Fröhlich R, Nissinen M. Formation of the [(s-trans-η4-Butadiene)TaCp*Cp]+ Cation and Its Reaction with Organic Carbonyl Derivatives. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(199909)1999:9<1453::aid-ejic1453>3.0.co;2-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Strauch HC, Bergander K, Kehr G, Fröhlich R, Erker G. Group 5 Metal Complexes with Cyclooctatetraene: Formation and Characterization of (Butadiene)(cyclooctatetraene)(cyclopentadienyl)tantalum Systems. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(199909)1999:9<1461::aid-ejic1461>3.0.co;2-b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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42
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Lee LWM, Piers WE, Parvez M, Rettig SJ, Young VG. Zwitterionic Metallocenes Derived from rac and meso-Ethylenebisindenyl Zirconocene Olefin Complexes and Pentafluorophenyl-Substituted Boranes. Organometallics 1999. [DOI: 10.1021/om990383d] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lawrence W. M. Lee
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4, Canada, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6, Canada, and Department of Chemistry, University of Minnesota, 207 Pleasant Street S. E., Minneapolis, Minnesota 55455
| | - Warren E. Piers
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4, Canada, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6, Canada, and Department of Chemistry, University of Minnesota, 207 Pleasant Street S. E., Minneapolis, Minnesota 55455
| | - Masood Parvez
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4, Canada, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6, Canada, and Department of Chemistry, University of Minnesota, 207 Pleasant Street S. E., Minneapolis, Minnesota 55455
| | - Steven J. Rettig
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4, Canada, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6, Canada, and Department of Chemistry, University of Minnesota, 207 Pleasant Street S. E., Minneapolis, Minnesota 55455
| | - Victor G. Young
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4, Canada, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6, Canada, and Department of Chemistry, University of Minnesota, 207 Pleasant Street S. E., Minneapolis, Minnesota 55455
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43
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Cook KS, Piers WE, Rettig SJ. Reactions of Bis(pentafluorophenyl)borane with Cp2Ta(CH2)CH3. Organometallics 1999. [DOI: 10.1021/om9900418] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kevin S. Cook
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4 Canada, and Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6 Canada
| | - Warren E. Piers
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4 Canada, and Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6 Canada
| | - Steven J. Rettig
- Department of Chemistry, University of Calgary, 2500 University Drive N. W., Calgary, Alberta, T2N 1N4 Canada, and Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6 Canada
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44
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Ahlers W, Erker G, Fröhlich R, Peuchert U. Coupling of σ-acetylide ligands at Group 4 metallocene complexes to yield methylenecyclopropene-type frameworks. J Organomet Chem 1999. [DOI: 10.1016/s0022-328x(98)01113-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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45
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Dahlmann M, Erker G, Nissinen M, Fröhlich R. Direct Experimental Observation of the Stereochemistry of the First Propene Insertion Step at an Active Homogeneous Single-Component Metallocene Ziegler Catalyst. J Am Chem Soc 1999. [DOI: 10.1021/ja983595v] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marc Dahlmann
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Maija Nissinen
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
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46
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Britovsek GJP, Gibson VC, Wass DF. Auf der Suche nach einer neuen Generation von Katalysatoren zur Olefinpolymerisation: „Leben” jenseits der Metallocene. Angew Chem Int Ed Engl 1999. [DOI: 10.1002/(sici)1521-3757(19990215)111:4<448::aid-ange448>3.0.co;2-2] [Citation(s) in RCA: 215] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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47
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48
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Guérin F, McConville DH, Vittal JJ, Yap GAP. Synthesis, Structure, and Reactivity of Zirconium Alkyl Complexes Bearing Ancillary Pyridine Diamide Ligands. Organometallics 1998. [DOI: 10.1021/om980146v] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frédéric Guérin
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1; Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7; and Windsor Molecular Structure Center, Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B 3P4
| | - David H. McConville
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1; Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7; and Windsor Molecular Structure Center, Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B 3P4
| | - Jagadese J. Vittal
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1; Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7; and Windsor Molecular Structure Center, Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B 3P4
| | - Glen A. P. Yap
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1; Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7; and Windsor Molecular Structure Center, Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B 3P4
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49
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Ahlers W, Erker G, Fröhlich R. Zirconocene-(μ-Organyl)borate Betaines Derived by Treatment of a (σ-Alkenyl)(σ-alkynyl)zirconocene Complex with Tris(pentafluorophenyl)borane⋆. Eur J Inorg Chem 1998. [DOI: 10.1002/(sici)1099-0682(199807)1998:7<889::aid-ejic889>3.0.co;2-r] [Citation(s) in RCA: 12] [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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50
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Pindado GJ, Lancaster SJ, Thornton-Pett M, Bochmann M. Construction of a Borole Ligand from Coordinated Diene and B(C6F5)3 via Successive C−H Activation Steps: A Case of Catalyst Self-Activation. J Am Chem Soc 1998. [DOI: 10.1021/ja981069y] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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