1
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Specklin D, Coffinet A, Vendier L, del Rosal I, Dinoi C, Simonneau A. Synthesis, Characterization, and Comparative Theoretical Investigation of Dinitrogen-Bridged Group 6-Gold Heterobimetallic Complexes. Inorg Chem 2021; 60:5545-5562. [PMID: 33724789 PMCID: PMC8058778 DOI: 10.1021/acs.inorgchem.0c03271] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Indexed: 01/21/2023]
Abstract
We have prepared and characterized a series of unprecedented group 6-group 11, N2-bridged, heterobimetallic [ML4(η1-N2)(μ-η1:η1-N2)Au(NHC)]+ complexes (M = Mo, W, L2 = diphosphine) by treatment of trans-[ML4(N2)2] with a cationic gold(I) complex [Au(NHC)]+. The adducts are very labile in solution and in the solid, especially in the case of molybdenum, and decomposition pathways are likely initiated by electron transfers from the zerovalent group 6 atom to gold. Spectroscopic and structural parameters point to the fact that the gold adducts are very similar to Lewis pairs formed out of strong main-group Lewis acids (LA) and low-valent, end-on dinitrogen complexes, with a bent M-N-N-Au motif. To verify how far the analogy goes, we computed the electronic structures of [W(depe)2(η1-N2)(μ-η1:η1-N2)AuNHC]+ (10W+) and [W(depe)2(η1-N2)(μ-η1:η1-N2)B(C6F5)3] (11W). A careful analysis of the frontier orbitals of both compounds shows that a filled orbital resulting from the combination of the π* orbital of the bridging N2 with a d orbital of the group 6 metal overlaps in 10W+ with an empty sd hybrid orbital at gold, whereas in 11W with an sp3 hybrid orbital at boron. The bent N-N-LA arrangement maximizes these interactions, providing a similar level of N2 "push-pull" activation in the two compounds. In the gold case, the HOMO-2 orbital is further delocalized to the empty carbenic p orbital, and an NBO analysis suggests an important electrostatic component in the μ-N2-[Au(NHC)]+ bond.
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Affiliation(s)
- David Specklin
- LCC−CNRS,
Université de Toulouse, CNRS, UPS, 205 route de Narbonne, BP44099, F-31077 Toulouse cedex 4, France
| | - Anaïs Coffinet
- LCC−CNRS,
Université de Toulouse, CNRS, UPS, 205 route de Narbonne, BP44099, F-31077 Toulouse cedex 4, France
| | - Laure Vendier
- LCC−CNRS,
Université de Toulouse, CNRS, UPS, 205 route de Narbonne, BP44099, F-31077 Toulouse cedex 4, France
| | - Iker del Rosal
- LPCNO,
CNRS, and INSA, Université Paul Sabatier, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Chiara Dinoi
- LPCNO,
CNRS, and INSA, Université Paul Sabatier, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Antoine Simonneau
- LCC−CNRS,
Université de Toulouse, CNRS, UPS, 205 route de Narbonne, BP44099, F-31077 Toulouse cedex 4, France
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2
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Caise A, Hicks J, Ángeles Fuentes M, Goicoechea JM, Aldridge S. Partnering a Three-Coordinate Gallium Cation with a Hydroborate Counter-Ion for the Catalytic Hydrosilylation of CO 2. Chemistry 2021; 27:2138-2148. [PMID: 33169886 DOI: 10.1002/chem.202004408] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/08/2020] [Indexed: 12/16/2022]
Abstract
A novel β-diketiminate stabilized gallium hydride, (Dipp L)Ga(Ad)H (where (Dipp L)={HC(MeCDippN)2 }, Dipp=2,6-diisopropylphenyl and Ad=1-adamantyl), has been synthesized and shown to undergo insertion of carbon dioxide into the Ga-H bond under mild conditions. In this case, treatment of the resulting κ1 -formate complex with triethylsilane does not lead to regeneration of the hydride precursor. However, when combined with B(C6 F5 )3 , (Dipp L)Ga(Ad)H catalyses the reductive hydrosilylation of CO2 . Under stoichiometric conditions, the addition of one equivalent of B(C6 F5 )3 to (Dipp L)Ga(Ad)H leads to the formation of a 3-coordinate cationic gallane complex, partnered with a hydroborate anion, [(Dipp L)Ga(Ad)][HB(C6 F5 )3 ]. This complex rapidly hydrometallates carbon dioxide and catalyses the selective reduction of CO2 to the formaldehyde oxidation level at 60 °C in the presence of Et3 SiH (yielding H2 C(OSiEt3 )2 ). When catalysis is undertaken in the presence of excess B(C6 F5 )3 , appreciable enhancement of activity is observed, with a corresponding reduction in selectivity: the product distribution includes H2 C(OSiEt3 )2 , CH4 and O(SiEt3 )2 . While this system represents proof-of-concept in CO2 hydrosilylation by a gallium hydride system, the TOF values obtained are relatively modest (max. 10 h-1 ). This is attributed to the strength of binding of the formatoborate anion to the gallium centre in the catalytic intermediate (Dipp L)Ga(Ad){OC(H)OB(C6 F5 )3 }, and the correspondingly slow rate of the turnover-limiting hydrosilylation step. In turn, this strength of binding can be related to the relatively high Lewis acidity measured for the [(Dipp L)Ga(Ad)]+ cation (AN=69.8).
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Affiliation(s)
- Alexa Caise
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK
| | - Jamie Hicks
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK
| | - M Ángeles Fuentes
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK
| | - Jose M Goicoechea
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK
| | - Simon Aldridge
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK
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3
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Bonnin Q, Wong S, Balan C, Comte V, Malacea R, Penouilh M, Richard P, Kehr G, Normand AT, Erker G, Le Gendre P. A Route toward (Aminomethyl)cyclopentadienide Ligands and Their Group 4 Metal Complexes. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Quentin Bonnin
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Sook‐Yen Wong
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Cédric Balan
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Virginie Comte
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Raluca Malacea
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Marie‐José Penouilh
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Philippe Richard
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Gerald Kehr
- Organisch‐Chemisches Institut Westfälische Wilhelms‐Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Adrien T. Normand
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
| | - Gerhard Erker
- Organisch‐Chemisches Institut Westfälische Wilhelms‐Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Pierre Le Gendre
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB, UMR‐CNRS 6302) Université de Bourgogne Franche‐Comté 9, av. Alain Savary 21078 Dijon Cedex France
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4
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Al-Harbi A, Hammond MJ, Parkin G. Organometallic Zirconium Compounds in an Oxygen-Rich Coordination Environment: Synthesis and Structural Characterization of Tris(oxoimidazolyl)hydroboratozirconium Compounds. Inorg Chem 2018; 57:1426-1437. [PMID: 29314851 DOI: 10.1021/acs.inorgchem.7b02832] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of tris(oxoimidazolyl)hydroborato ligands, which serve as L2X [O3] donors, have been employed to obtain organometallic zirconium compounds in an uncommon oxygen-rich coordination environment. For example, Cp[ToMeBenz]ZrCl2 has been synthesized via the reaction of [ToMeBenz]Na with CpZrCl3 and bears a structural resemblance to the bent metallocene dichloride derivative Cp2ZrCl2. In addition, the half-sandwich counterparts [ToMeBenz]ZrCl3 and [ToBut]ZrCl3 have been obtained by metathesis of ZrCl4 with [ToMeBenz]Na and [ToBut]Na, respectively. The structurally related zirconium benzyl compounds [ToRBenz]Zr(CH2Ph)3 (R = Me, But, 1-Ad) have also been synthesized via the reactions of [ToRBenz]Tl with Zr(CH2Ph)4, and X-ray diffraction studies demonstrate that the benzyl ligands in these compounds are conformationally flexible and exhibit a large range of Zr-CH2-Ph bond angles (94.7-131.7°). Protolytic cleavage of one of the benzyl ligands of [ToRBenz]Zr(CH2Ph)3 (R = But, 1-Ad) may be achieved by treatment with [PhNHMe2][B(C6F5)4] to generate {[ToRBenz]Zr(CH2Ph)2}[B(C6F5)4], which are catalysts for the polymerization of ethylene. The molecular structure of the ether adduct, {[ToButBenz]Zr(CH2Ph)2(OEt2)}[B(C6F5)4], has been determined by X-ray diffraction. In addition to the use of tris(oxoimidazolyl)hydroborato ligands, bis(oxoimidazolyl)hydroborato ligands have also been used to obtain zirconium benzyl compounds in oxygen-rich environments, namely, [BoMeBenz]2Zr(CH2Ph)2 and [BoAdBenz]2Zr(CH2Ph)2.
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Affiliation(s)
- Ahmed Al-Harbi
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Matthew J Hammond
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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5
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Varga V, Večeřa M, Gyepes R, Pinkas J, Horáček M, Merna J, Lamač M. Effects of the Linking of Cyclopentadienyl and Ketimide Ligands in Titanium Half-Sandwich Olefin Polymerization Catalysts. ChemCatChem 2017. [DOI: 10.1002/cctc.201700498] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Vojtech Varga
- J. Heyrovský Institute of Physical Chemistry; The Czech Academy of Sciences, v.v.i.; Dolejškova 2155/3 18223 Prague 8 Czech Republic
| | - Miloš Večeřa
- J. Heyrovský Institute of Physical Chemistry; The Czech Academy of Sciences, v.v.i.; Dolejškova 2155/3 18223 Prague 8 Czech Republic
| | - Róbert Gyepes
- J. Heyrovský Institute of Physical Chemistry; The Czech Academy of Sciences, v.v.i.; Dolejškova 2155/3 18223 Prague 8 Czech Republic
- Department of Inorganic Chemistry; Faculty of Science; Charles University in Prague; Hlavova 2030 12840 Prague 2 Czech Republic
| | - Jiří Pinkas
- J. Heyrovský Institute of Physical Chemistry; The Czech Academy of Sciences, v.v.i.; Dolejškova 2155/3 18223 Prague 8 Czech Republic
| | - Michal Horáček
- J. Heyrovský Institute of Physical Chemistry; The Czech Academy of Sciences, v.v.i.; Dolejškova 2155/3 18223 Prague 8 Czech Republic
| | - Jan Merna
- Department of Polymers; University of Chemistry and Technology Prague; Technická 5 166 28 Prague 6 Czech Republic
| | - Martin Lamač
- J. Heyrovský Institute of Physical Chemistry; The Czech Academy of Sciences, v.v.i.; Dolejškova 2155/3 18223 Prague 8 Czech Republic
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6
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Večeřa M, Varga V, Císařová I, Pinkas J, Kucharczyk P, Sedlařík V, Lamač M. Group 4 Metal Complexes of Chelating Cyclopentadienyl-ketimide Ligands. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Miloš Večeřa
- J.
Heyrovský Institute of Physical Chemistry, The Czech Academy of Sciences, v.v.i., Dolejškova 2155/3, 18223 Prague 8, Czech Republic
- Department
of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic
| | - Vojtech Varga
- J.
Heyrovský Institute of Physical Chemistry, The Czech Academy of Sciences, v.v.i., Dolejškova 2155/3, 18223 Prague 8, Czech Republic
| | - Ivana Císařová
- Department
of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic
| | - Jiří Pinkas
- J.
Heyrovský Institute of Physical Chemistry, The Czech Academy of Sciences, v.v.i., Dolejškova 2155/3, 18223 Prague 8, Czech Republic
| | - Pavel Kucharczyk
- Centre
of Polymer Systems, University Institute, Tomáš Bat’a University in Zlín, tř. T. Bati 5678, 76001 Zlín, Czech Republic
| | - Vladimír Sedlařík
- Centre
of Polymer Systems, University Institute, Tomáš Bat’a University in Zlín, tř. T. Bati 5678, 76001 Zlín, Czech Republic
| | - Martin Lamač
- J.
Heyrovský Institute of Physical Chemistry, The Czech Academy of Sciences, v.v.i., Dolejškova 2155/3, 18223 Prague 8, Czech Republic
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7
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Taullaj F, Armstrong D, Lough AJ, Fekl U. Iridium complexes containing N-donor-functionalized η1-fluorenyl ligands. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.08.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Chen Z, Liu J, Pei H, Liu W, Chen Y, Wu J, Li W, Li Y. Directed Amination of Aryl Methyl Ethers Mediated by Ti(NMe2)4 at Room Temperature. Org Lett 2015; 17:3406-9. [PMID: 26125640 DOI: 10.1021/acs.orglett.5b01229] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient C-O amination of aryl methyl ethers has been achieved. This transformation proceeds via imine-directed Ti(IV)-mediated cross-coupling reactions between aryl methyl ethers and Ti(NR2)4 at room temperature, straightforwardly leading to a series of arylamines. This protocol features a wide substrate scope, exclusive regioselectivity, and mild reaction conditions.
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Affiliation(s)
- Zhou Chen
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215006, China
| | - Jinna Liu
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215006, China
| | - Hao Pei
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215006, China
| | - Wei Liu
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215006, China
| | - Yanmei Chen
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215006, China
| | - Jian Wu
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215006, China
| | - Wu Li
- ‡Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Qinghai 810008, China
| | - Yahong Li
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215006, China
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9
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Rohde VHG, Müller MF, Oestreich M. Intramolecularly Sulfur-Stabilized Silicon Cations with Chiral Binaphthyl Backbones: Synthesis of Three Different Motifs and Their Application in Enantioselective Diels–Alder Reactions. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00351] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Volker H. G. Rohde
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 115, 10623 Berlin, Germany
| | - Maria F. Müller
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 115, 10623 Berlin, Germany
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 115, 10623 Berlin, Germany
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10
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Keess S, Simonneau A, Oestreich M. Direct and Transfer Hydrosilylation Reactions Catalyzed by Fully or Partially Fluorinated Triarylboranes: A Systematic Study. Organometallics 2015. [DOI: 10.1021/om501284a] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Sebastian Keess
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
| | - Antoine Simonneau
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
| | - Martin Oestreich
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
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11
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Eller C, Kehr G, Daniliuc CG, Stephan DW, Erker G. Thiophene synthesis via 1,1-carboboration. Chem Commun (Camb) 2015; 51:7226-9. [PMID: 25813555 DOI: 10.1039/c5cc01806d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of bis(tert-butylethynyl)sulfide with the boron Lewis acid reagents X–B(C6F5)2 (X = CH3, Cl, C6F5) in pentane at r.t. gave the respective borylated thiophenes in a sequence of 1,1-carboboration reactions.
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Affiliation(s)
- Christina Eller
- Organisch-Chemisches Institut der Universität Münster
- 48149 Münster
- Germany
- Department of Chemistry University of Toronto
- Toronto
| | - Gerald Kehr
- Organisch-Chemisches Institut der Universität Münster
- 48149 Münster
- Germany
| | | | | | - Gerhard Erker
- Organisch-Chemisches Institut der Universität Münster
- 48149 Münster
- Germany
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12
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Loose F, Plettenberg I, Haase D, Saak W, Schmidtmann M, Schäfer A, Müller T, Beckhaus R. Aromatic Imines in the Titanocene Coordination Sphere—Titanaaziridine vs 1-Aza-2-titanacyclopent-4-ene Structures. Organometallics 2014. [DOI: 10.1021/om500750y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Florian Loose
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Inka Plettenberg
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Detlev Haase
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Wolfgang Saak
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - André Schäfer
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Rüdiger Beckhaus
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
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13
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Phillips N, Dodson T, Tirfoin R, Bates JI, Aldridge S. Expanded-ring N-heterocyclic carbenes for the stabilization of highly electrophilic gold(I) cations. Chemistry 2014; 20:16721-31. [PMID: 25336057 DOI: 10.1002/chem.201404939] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Indexed: 12/31/2022]
Abstract
Strategies for the synthesis of highly electrophilic Au(I) complexes from either hydride- or chloride-containing precursors have been investigated by employing sterically encumbered Dipp-substituted expanded-ring NHCs (Dipp=2,6-iPr2 C6 H3 ). Thus, complexes of the type (NHC)AuH have been synthesised (for NHC=6-Dipp or 7-Dipp) and shown to feature significantly more electron-rich hydrides than those based on ancillary imidazolylidene donors. This finding is consistent with the stronger σ-donor character of these NHCs, and allows for protonation of the hydride ligand. Such chemistry leads to the loss of dihydrogen and to the trapping of the [(NHC)Au](+) fragment within a dinuclear gold cation containing a bridging hydride. Activation of the hydride ligand in (NHC)AuH by B(C6 F5 )3 , by contrast, generates a species (at low temperatures) featuring a [HB(C6 F5 )3 ](-) fragment with spectroscopic signatures similar to the "free" borate anion. Subsequent rearrangement involves BC bond cleavage and aryl transfer to the carbophilic metal centre. Under halide abstraction conditions utilizing Na[BAr(f) 4 ] (Ar(f) =C6 H3 (CF3 )2 -3,5), systems of the type [(NHC)AuCl] (NHC=6-Dipp or 7-Dipp) generate dinuclear complexes [{(NHC)Au}2 (μ-Cl)](+) that are still electrophilic enough at gold to induce aryl abstraction from the [BAr(f) 4 ](-) counterion.
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Affiliation(s)
- Nicholas Phillips
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR (UK)
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14
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Rohde VHG, Pommerening P, Klare HFT, Oestreich M. Intramolecularly Sulfur-Stabilized Silicon Cations as Lewis Acid Catalysts. Organometallics 2014. [DOI: 10.1021/om500570d] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Volker H. G. Rohde
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
| | - Phillip Pommerening
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
| | - Hendrik F. T. Klare
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
| | - Martin Oestreich
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
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15
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Batke S, Sietzen M, Wadepohl H, Ballmann J. A tripodal benzylene-linked trisamidophosphine ligand scaffold: synthesis and coordination chemistry with group(IV) metals. Inorg Chem 2014; 53:4144-53. [PMID: 24712705 DOI: 10.1021/ic500163c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A new tripodal trisamidophosphine ligand (1) based on the trisbenzylphosphine backbone has been synthesized in three steps starting from NaPH2 and phthaloyl-protected 2-aminobenzyl bromide. At elevated temperatures, 1 reacts directly with M(NMe2)4 (M = Zr, Hf) to afford the dimethylamido complexes [PN3]M(NMe2) (M = Zr, Hf) (2), which are easily converted into the corresponding triflates [PN3]MOTf (M = Zr, Hf) (3) via reaction with triethylsilyl trifluoromethanesulfonate. The related titanium chloro complex [PN3]TiCl (4-Ti) is obtained from 1 and Bn3TiCl via protonolysis. Triple deprotonation of 1 with n-butyllithium affords the tris-lithium salt Li3[PN3] (1-Li), which serves as a common starting material for the preparation of all the group(IV) chlorides [PN3]MCl (M = Ti, Zr, Hf) (4). Upon treatment of 4-Ti with Bn2Mg(thf)2, formation of a benzyltitanium species is observed, which is converted cleanly into a ligand-CH-activated species (5-Ti).
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Affiliation(s)
- Sonja Batke
- Anorganisch-Chemisches Institut, Universität Heidelberg , Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
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16
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Arnott GE, Moquist P, Daniliuc CG, Kehr G, Erker G. A Phosphino Calix[4]arene Bis-Frustrated Lewis Pair. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301529] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Synthesis and X-ray crystal structure of [Me2Si(C5Me2H2)(tBuN)]MCl2 (M=Ti, Zr) bearing a 3,4-dimethylcyclopentadienyl ring: Investigation of the substitution effect on the cyclopentadienyl (Cp) ring for catalytic performance in ethylene/1-octene (co)polymerization. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.08.072] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Morton JGM, Al-Shammari H, Sun Y, Zhu J, Stephan DW. 1,1-Olefin-bridged bis-(2-indenyl) metallocenes of titanium and zirconium. Dalton Trans 2014; 43:13219-31. [DOI: 10.1039/c4dt01583e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tetrasubstituted alkenes bearing geminal 2-indenyl substituents were synthesized and metallated to form a new class of ansa titanium and zirconium metallocene complexes containing a single sp2-hybridized carbon bridge.
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Affiliation(s)
| | | | - Yunshan Sun
- Department of Chemistry
- University of Toronto
- Toronto, Canada
| | - Jiangtao Zhu
- Department of Chemistry
- University of Toronto
- Toronto, Canada
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19
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Nödling AR, Müther K, Rohde VHG, Hilt G, Oestreich M. Ferrocene-Stabilized Silicon Cations as Catalysts for Diels–Alder Reactions: Attempted Experimental Quantification of Lewis Acidity and ReactIR Kinetic Analysis. Organometallics 2013. [DOI: 10.1021/om401040y] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Alexander R. Nödling
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35043 Marburg, Germany
| | - Kristine Müther
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
| | - Volker H. G. Rohde
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
| | - Gerhard Hilt
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35043 Marburg, Germany
| | - Martin Oestreich
- Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 115, 10623 Berlin, Germany
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20
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Müther K, Hrobárik P, Hrobáriková V, Kaupp M, Oestreich M. The Family of Ferrocene‐Stabilized Silylium Ions: Synthesis,29Si NMR Characterization, Lewis Acidity, Substituent Scrambling, and Quantum‐Chemical Analyses. Chemistry 2013; 19:16579-94. [DOI: 10.1002/chem.201302885] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Kristine Müther
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin (Germany)
- Organisch‐Chemisches Institut, Westfälische Wilhelms‐Universität Münster, Corrensstrasse 40, 48149 Münster (Germany)
| | - Peter Hrobárik
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin (Germany)
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 84536 Bratislava (Slovakia)
| | - Veronika Hrobáriková
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin (Germany)
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina, 84215 Bratislava (Slovakia)
| | - Martin Kaupp
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin (Germany)
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin (Germany)
- Organisch‐Chemisches Institut, Westfälische Wilhelms‐Universität Münster, Corrensstrasse 40, 48149 Münster (Germany)
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21
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Tao X, Wu Q, Huo H, Gao W, Mu Y. New Titanium(IV) Complexes with 2-Cyclopentadienylbenzylamido Ligands: Synthesis, Characterization, and Catalytic Properties for Ethylene Polymerization and Copolymerization with 1-Hexene. Organometallics 2013. [DOI: 10.1021/om4003945] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Xin Tao
- The State Key Laboratory for Supramolecular
Structure
and Materials, School of Chemistry, Jilin University, 2699 Qianjin Street,
Changchun 130012, People’s Republic of China
| | - Qiaolin Wu
- The State Key Laboratory for Supramolecular
Structure
and Materials, School of Chemistry, Jilin University, 2699 Qianjin Street,
Changchun 130012, People’s Republic of China
| | - Hang Huo
- The State Key Laboratory for Supramolecular
Structure
and Materials, School of Chemistry, Jilin University, 2699 Qianjin Street,
Changchun 130012, People’s Republic of China
| | - Wei Gao
- The State Key Laboratory for Supramolecular
Structure
and Materials, School of Chemistry, Jilin University, 2699 Qianjin Street,
Changchun 130012, People’s Republic of China
| | - Ying Mu
- The State Key Laboratory for Supramolecular
Structure
and Materials, School of Chemistry, Jilin University, 2699 Qianjin Street,
Changchun 130012, People’s Republic of China
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22
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Ge F, Kehr G, Daniliuc CG, Erker G. Unusual Pathway Taken in the Reaction of Bis(alkynyl)diisopropylaminoboranes with B(C6F5)3. Chem Asian J 2013; 8:2227-34. [DOI: 10.1002/asia.201300536] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Indexed: 11/08/2022]
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23
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Synthesis of sp 3C1-Bridged Constrained Geometry Complexes and their Application for Copolymerization of Ethylene and 1-Octene . ACTA ACUST UNITED AC 2013. [DOI: 10.4028/www.scientific.net/amr.683.280] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel sp3C1-bridged constrained geometry complexe(CGC) were synthesized, and fulvene was used as initial stuff, they were characterized by 1H-NMR, 13C NMR, MS and EA. The CGC/methylaluminoxane (MAO) system show activation for copolymerization of ethylene and 1-octene under 1.0 atmospheric pressure (Complex 2/MAO, 1.196 × 106 g-Polymer /mol-Zr•h, Pethylene = 1.0 atm, Al/Zr = 1000, time = 30 min,1-Octene content in polymer = 5.46 mol%).
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24
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Kronig S, Jones PG, Tamm M. Preparation of 2-Alkylidene-Substituted 1,3,4,5-Tetramethylimidazolines and Their Reactivity Towards RhIComplexes and B(C6F5)3. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201516] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Kolychev EL, Bannenberg T, Freytag M, Daniliuc CG, Jones PG, Tamm M. Reactivity of a Frustrated Lewis Pair and Small-Molecule Activation by an Isolable Arduengo CarbeneB{3,5-(CF3)2C6H3}3Complex. Chemistry 2012; 18:16938-46. [DOI: 10.1002/chem.201202840] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Indexed: 12/16/2022]
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26
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Mewald M, Oestreich M. Illuminating the Mechanism of the Borane-Catalyzed Hydrosilylation of Imines with Both an Axially Chiral Borane and Silane. Chemistry 2012; 18:14079-84. [DOI: 10.1002/chem.201202693] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Indexed: 11/06/2022]
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27
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Feldmann A, Iida A, Fröhlich R, Yamaguchi S, Kehr G, Erker G. Preparation of Dihydroborole Derivatives by a Simple 1,1-Carboboration Route. Organometallics 2012. [DOI: 10.1021/om300065m] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andreas Feldmann
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
| | - Azusa Iida
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
- Department of Chemistry, Graduate
School of Science, Nagoya University Furo, Chikusa, Nagoya 464-8602, Japan
| | - Roland Fröhlich
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
| | - Shigehiro Yamaguchi
- Department of Chemistry, Graduate
School of Science, Nagoya University Furo, Chikusa, Nagoya 464-8602, Japan
| | - Gerald Kehr
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse
40, 48149 Münster, Germany
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28
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Xu BH, Yanez RAA, Nakatsuka H, Kitamura M, Fröhlich R, Kehr G, Erker G. Reaction of Frustrated Lewis Pairs with Ketones and Esters. Chem Asian J 2012; 7:1347-56. [DOI: 10.1002/asia.201100960] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2011] [Indexed: 11/11/2022]
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29
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Chapman AM, Wass DF. Cationic Ti(iv) and neutral Ti(iii) titanocene–phosphinoaryloxide frustrated Lewis pairs: hydrogen activation and catalytic amine-borane dehydrogenation. Dalton Trans 2012; 41:9067-72. [DOI: 10.1039/c2dt30168g] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Tay BY, Wang C, Stubbs LP, Jacob C, van Meurs M. Deuterated dimethyl sulfoxide as a good NMR solvent for the characterization of alkali metal cyclopentadienides, amides, alkoxides and phenoxides. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.07.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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Kronig S, Theuergarten E, Holschumacher D, Bannenberg T, Daniliuc CG, Jones PG, Tamm M. Dihydrogen Activation by Frustrated Carbene-Borane Lewis Pairs: An Experimental and Theoretical Study of Carbene Variation. Inorg Chem 2011; 50:7344-59. [DOI: 10.1021/ic201290g] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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32
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Rusli W, Tay BY, Stubbs LP, van Meurs M, Tan J, Jacob C, Chia SC, Woo YL, Wang C. Polymerizable group 4 ansa-cyclopentadienyl-amido catalysts for the copolymerization of ethylene with 1-octene. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Konkol M, Nabika M, Kohno T, Hino T, Miyatake T. Synthesis, structure and α-olefin polymerization activity of group 4 metal complexes with [OSSO]-type bis(phenolate) ligands. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.01.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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34
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Unverhau K, Kehr G, Fröhlich R, Erker G. Synthesis of [3]ferrocenophane-bridged Cp-amido zirconium complexes and ansa-zirconocene complexes and their use in catalytic polymerisation reactions. Dalton Trans 2011; 40:3724-36. [PMID: 21384004 DOI: 10.1039/c0dt01430c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Starting from 1,1'-diacetylferrocene the ortho-amino,α-dimethylamino[3]ferrocenophane system 3 was prepared. This was converted to the o-imino,α-Cp-derivative 6. Subsequent treatment with e.g. an excess of methyllithium followed by ZrCl(2)(NMe(2))(2)(thf)(2) and Me(2)SiCl(2) eventually gave the [3]ferrocenophane based Cp-amido zirconium complex 11b. In a similar way the [3]ferrocenophane derived fluorenyl-Cp ansa-zirconocene dichloride complex 20 was obtained. The 20-methylalumoxane (MAO) system is an active homogeneous Ziegler-Natta catalyst for ethylene polymerization. The 11b-MAO system reacts efficiently with an ethene-1-octene mixture to yield a mixture of linear polyethylene plus the ethene-1-octene copolymer. The compounds 5, 8, 10b, 11b, 13, 14, and 20 were characterized by X-ray diffraction.
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Affiliation(s)
- Kerstin Unverhau
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, D-48149, Münster, Germany
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35
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Chen C, Kehr G, Fröhlich R, Erker G. Carbon-carbon bond activation by 1,1-carboboration of internal alkynes. J Am Chem Soc 2011; 132:13594-5. [PMID: 20831196 DOI: 10.1021/ja106365j] [Citation(s) in RCA: 139] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Internal alkynes undergo 1,1-carboboration reactions upon treatment with boranes RB(C(6)F(5))(2) (R = C(6)F(5), CH(3)) to yield trisubstituted alkenylboranes. These products can be used as substrates in Pd-catalyzed cross-coupling reactions.
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Affiliation(s)
- Chao Chen
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
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36
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Ayinla RO, Schafer LL. Intermolecular hydroamination of oxygen-substituted allenes. New routes for the synthesis of N,O-chelated zirconium and titanium amido complexes. Dalton Trans 2011; 40:7769-76. [DOI: 10.1039/c1dt10448a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Chen C, Voss T, Fröhlich R, Kehr G, Erker G. 1,1-carboboration of 1-alkynes: a conceptual alternative to the hydroboration reaction. Org Lett 2010; 13:62-5. [PMID: 21128629 DOI: 10.1021/ol102544x] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Strongly electrophilic boranes R-B(C(6)F(5))(2) react readily with a variety of 1-alkynes by means of a 1,1-carboboration reaction to yield alkenylborane products, which can subsequently be used as reagents in metal catalyzed cross-coupling reactions.
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Affiliation(s)
- Chao Chen
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
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38
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Chen C, Eweiner F, Wibbeling B, Fröhlich R, Senda S, Ohki Y, Tatsumi K, Grimme S, Kehr G, Erker G. Exploring the Limits of Frustrated Lewis Pair Chemistry with Alkynes: Detection of a System that Favors 1,1-Carboboration over Cooperative 1,2-P/B-Addition. Chem Asian J 2010; 5:2199-208. [DOI: 10.1002/asia.201000189] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Ashley AE, Thompson AL, O'Hare D. Non-metal-mediated homogeneous hydrogenation of CO2 to CH3OH. Angew Chem Int Ed Engl 2010; 48:9839-43. [PMID: 19937890 DOI: 10.1002/anie.200905466] [Citation(s) in RCA: 432] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Andrew E Ashley
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK.
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40
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Senda T, Hanaoka H, Nakahara S, Oda Y, Tsurugi H, Mashima K. Rational Design of Silicon-Bridged Fluorenyl−Phenoxy Group 4 Metal Complexes as Catalysts for Producing High Molecular Weight Copolymers of Ethylene and 1-Hexene at Elevated Temperature. Macromolecules 2010. [DOI: 10.1021/ma902700v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Taichi Senda
- Organic Synthesis Research Laboratory, Sumitomo Chemical Co., Ltd., 1-98, Kasugadenaka 3-chome, Konohana-ku, Osaka 554-8558, Japan
| | - Hidenori Hanaoka
- Organic Synthesis Research Laboratory, Sumitomo Chemical Co., Ltd., 1-98, Kasugadenaka 3-chome, Konohana-ku, Osaka 554-8558, Japan
| | - Shinya Nakahara
- Petrochemicals Research Laboratory, Sumitomo Chemical Co., Ltd., 2-1, Kitasode, Sodegaura, Chiba 299-0295, Japan
| | - Yoshiaki Oda
- Organic Synthesis Research Laboratory, Sumitomo Chemical Co., Ltd., 1-98, Kasugadenaka 3-chome, Konohana-ku, Osaka 554-8558, Japan
| | - Hayato Tsurugi
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Kazushi Mashima
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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41
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Wang C, van Meurs M, Stubbs LP, Tay BY, Tan XJ, Aitipamula S, Chacko J, Luo HK, Wong PK, Ye S. The amido-bridged zirconocene's reactivity and catalytic behavior for ethylene polymerization. Dalton Trans 2010; 39:807-14. [PMID: 20066225 DOI: 10.1039/b914458g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of the amido-bridged zirconium complex (CpSiMe(2)NSiMe(2)Cp)ZrCH(3) (1) (Cp = C(5)H(4)) with half an equivalent of B(C(6)F(5))(3) or Ph(3)CB(C(6)F(5))(4) afforded the binuclear zirconium complexes [(CpSiMe(2)NSiMe(2)Cp)Zr)(2)(mu-CH(3))][RB(C(6)F(5))(3)] (2a, R = CH(3), 2b, R = C(6)F(5)) with a methyl group as the bridge between the two zirconium atoms. In the presence of one equivalent of B(C(6)F(5))(3) or Ph(3)C(C(6)F(5))(4), 1 was transformed to the zwitterionic complexes [(CpSiMe(2)NSiMe(2)Cp)Zr][RB(C(6)F(5))(3)] (3a, R = CH(3), 3b, R = C(6)F(5)) which are free of a metal-bound sigma-alkyl ligand. 2b is stable with Me(3)Al while 3b combined with Me(3)Al to form a hetero-binuclear complex [(CpSiMe(2)NSiMe(2)Cp)Zr(mu-CH(3))]Al(CH(3))(2)][B(C(6)F(5))(4)] (4) as shown by NMR spectroscopy at room temperature. Treatment of 2a or 3a with an excess of Me(3)Al led to (CpSiMe(2)NSiMe(2)Cp)Zr(C(6)F(5)) (5) through a group exchange process. 2b, 3a and 5 have been characterized by X-ray diffraction studies. 2b, 2b, 3a and 3b were highly active catalysts for ethylene polymerization and copolymerization with 1-octene in the presence of trialkylaluminium, but the binuclear zirconium complexes (2a and 2b) showed higher activities than their mononuclear counterparts 3a and 3b. Polymerization activities varied with the trialkylaluminiums and increased with the trialkylaluminium concentration applied in the system. The product existed mainly in the form of Al(PE)(3) with polymeric chains, and its molecular weight and distribution were greatly influenced by the type and amount of trialkylaluminium applied in the catalytic system.
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Affiliation(s)
- Cun Wang
- Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), Singapore, 1 Pesek Road, Jurong Island, Singapore 627833.
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42
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Xu BH, Kehr G, Fröhlich R, Nauha E, Erker G. Zirconocene complexes bearing novel 3-dimethylamino-1,2-dihydropentalene derived ligand systems. Dalton Trans 2010; 39:9973-81. [DOI: 10.1039/c0dt00515k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Ashley A, Thompson A, O'Hare D. Non-Metal-Mediated Homogeneous Hydrogenation of CO2 to CH3OH. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200905466] [Citation(s) in RCA: 132] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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44
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Hog DT, Oestreich M. B(C6F5)3-Catalyzed Reduction of Ketones and Imines Using Silicon-Stereogenic Silanes: Stereoinduction by Single-Point Binding. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900796] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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45
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Wang C, Luo HK, van Meurs M, Stubbs LP, Wong PK. The New Tridentate Ligand CpSiNSiCp and Its Zirconium Complexes: Incorporation of Two Bridged Constrained-Geometry Units into One Molecule. Organometallics 2008. [DOI: 10.1021/om8004299] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cun Wang
- Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), Singapore, 1 Pesek Road, Jurong Island, Singapore 627833
| | - He-Kuan Luo
- Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), Singapore, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Martin van Meurs
- Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), Singapore, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Ludger P. Stubbs
- Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), Singapore, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Pui-Kwan Wong
- Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), Singapore, 1 Pesek Road, Jurong Island, Singapore 627833
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46
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Gurubasavaraj PM, Roesky HW, Nekoueishahraki B, Pal A, Herbst-Irmer R. From Unstable to Stable: Half-Metallocene Catalysts for Olefin Polymerization. Inorg Chem 2008; 47:5324-31. [DOI: 10.1021/ic800198e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Herbert W. Roesky
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Bijan Nekoueishahraki
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Aritra Pal
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Regine Herbst-Irmer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
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47
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Kang E, Kim S, Kim T, Chung J, Hahn JS, Ko J, Ok M, Cheong M, Kang SO. Structure–Catalytic Activity Relationship in Bridging Silacycloalkyl Ring Conformations of Constrained Geometry Titanium Complexes. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701312] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eugene Kang
- Department of Chemistry, Korea University, 208 Seochang, Chochiwon, Chung‐nam 339‐700, Korea, Fax: +82‐41‐867‐5396
| | - Sung‐Kwan Kim
- Department of Chemistry, Korea University, 208 Seochang, Chochiwon, Chung‐nam 339‐700, Korea, Fax: +82‐41‐867‐5396
| | - Tae‐Jin Kim
- Department of Chemistry, Korea University, 208 Seochang, Chochiwon, Chung‐nam 339‐700, Korea, Fax: +82‐41‐867‐5396
| | - Jae‐Ho Chung
- Department of Chemistry, Korea University, 208 Seochang, Chochiwon, Chung‐nam 339‐700, Korea, Fax: +82‐41‐867‐5396
| | - Jong Sok Hahn
- R&D Center, SK Corporation, 140‐1 Wonchon‐dong, Yuseong‐gu, Daejeon 305‐712, Korea
| | - Jaejung Ko
- Department of Chemistry, Korea University, 208 Seochang, Chochiwon, Chung‐nam 339‐700, Korea, Fax: +82‐41‐867‐5396
| | - Myung‐Ahn Ok
- R&D Center, SK Corporation, 140‐1 Wonchon‐dong, Yuseong‐gu, Daejeon 305‐712, Korea
| | - Minserk Cheong
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 130‐701, Korea
| | - Sang Ook Kang
- Department of Chemistry, Korea University, 208 Seochang, Chochiwon, Chung‐nam 339‐700, Korea, Fax: +82‐41‐867‐5396
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Nienkemper K, Kehr G, Kehr S, Fröhlich R, Erker G. (Amidomethyl)pyridine zirconium and hafnium complexes: Synthesis and structural characterization. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2007.12.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lee SH, Wu CJ, Yoo J, Kwak JE, Yun H, Lee BY. o-Phenylene-bridged Cp/amido titanium and zirconium complexes and their polymerization reactivity. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2007.11.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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50
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Erker G, Kehr G, Fröhlich R. Functionalized Alkali Metal Cyclopentadienides: Structural and Chemical Features. Organometallics 2007. [DOI: 10.1021/om7007666] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gerhard Erker
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches Institut der Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
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