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Donor-Functionalized Heterocyclic Carbene Complexes of Palladium (II): Efficient Catalysts for C-C Coupling Reactions
Citation
McGuinness, DS and Cavell, KJ, Donor-Functionalized Heterocyclic Carbene Complexes of Palladium (II): Efficient Catalysts for C-C Coupling Reactions, Organometallics, 19, (5) pp. 741-748. ISSN 0276-7333 (2000) [Refereed Article]
Abstract
Pd II complexes of donor-functionalized heterocyclic carbene ligands have been synthesized through a route involving carbene transfer from Ag I carbene precursors. The Ag complexes undergo facile reaction with PdCl 2(MeCN) 2 to yield Pd(C∧OPh) 2Cl 2 (3a), Pd(C∧OOMe) 2Cl 2 (3b), and Pd(C∧N) 2Cl 2 (3c) (C∧OPh = 3-methyl-1-phenacylimidazolin-2-ylidene, C∧OOMe = 3-methyl-1-(methylacetyl)imidazolin-2-ylidene, C∧N = 3-methyl-1-picolylimidazolin-2-ylidene), from which [Pd(C∧OOMe) 2(MeCN) 2][BF 4] 2 (4b) and [Pd(C∧N) 2][BF 4] 2 (4c) can be prepared by halide abstraction. When PdMeCl(cod) (cod = cyclooctadiene) is treated with the Ag complexes 2b and 2c, the Me-Pd carbene complexes [PdMe(C∧OOMe)Cl] 2 (5b), PdMe-(C∧N)Cl (5c), PdMe(C∧OOMe) 2Cl (6b), and PdMe(C∧N) 2Cl (6c) are obtained. The C∧OPh and CAOOMe ligands are monodentate with a dangling functional moiety in all complexes, while the CAN ligand exhibits both monodentate and chelating behavior. Several complexes give rise to highly active and very stable catalysts for Heck, Suzuki, and Sonogashira coupling reactions, with turnover numbers of up to 1 700 000 (Heck) and 127 500 (Suzuki) being obtained.
Item Details
Item Type: | Refereed Article |
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Research Division: | Chemical Sciences |
Research Group: | Inorganic chemistry |
Research Field: | Organometallic chemistry |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the chemical sciences |
UTAS Author: | McGuinness, DS (Dr David McGuinness) |
UTAS Author: | Cavell, KJ (Professor Kingsley Cavell) |
ID Code: | 19735 |
Year Published: | 2000 |
Web of Science® Times Cited: | 517 |
Deposited By: | Chemistry |
Deposited On: | 2000-08-01 |
Last Modified: | 2011-08-04 |
Downloads: | 0 |
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