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  Diaminocarbene- and Fischer-Carbene Complexes of Palladium and Nickel by Oxidative Insertion: Preparation, Structure, and Catalytic Activity

Kremzow, D., Seidel, G., Lehmann, C. W., & Fürstner, A. (2005). Diaminocarbene- and Fischer-Carbene Complexes of Palladium and Nickel by Oxidative Insertion: Preparation, Structure, and Catalytic Activity. Chemistry – A European Journal, 11(6), 1833-1853. doi:10.1002/chem.200400928.

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 Creators:
Kremzow, Doris1, Author              
Seidel, Günter1, Author              
Lehmann, Christian W.2, Author              
Fürstner, Alois1, Author              
Affiliations:
1Research Department Fürstner, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445584              
2Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              

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Free keywords: carbenes; cross-coupling; homogeneous catalysis; nickel; palladium
 Abstract: Oxidative insertion of [Pd(PPh3)4] or [Ni(cod)2]/PPh3 into the C–Cl bond of various 2-chloroimidazolinium- and other -amidinium salts affords metal–diaminocarbene complexes in good to excellent yields. This procedure is complementary to existing methodology in which the central metal does not change its oxidation state, and therefore allows to incorporate carbene fragments that are difficult to access otherwise. The preparation of a variety of achiral as well as enantiomerically pure, chiral metal–NHC complexes (NHC = N-heterocyclic carbene) and metal complexes with acyclic diaminocarbene ligands illustrates this aspect. Furthermore it is shown that oxidative insertion also paves a way to prototype Fischer carbenes of PdII. Since the required starting materials are readily available from urea- or thiourea derivatives, this novel approach allows for substantial structural variations of the ligand backbone. The catalytic performance of the resulting library of nickel- and palladium–carbene complexes has been evaluated by applications to prototype Suzuki-, Heck-, and Kumada–Corriu cross-coupling reactions as well as Buchwald–Hartwig aminations. It was found that even Fischer carbenes show appreciable catalytic activity. Moreover, representative examples of all types of neutral and cationic metal–carbene complexes formed in this study have been characterized by X-ray crystallography.

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Language(s): eng - English
 Dates: 2004-09-112005-01-262005-03-04
 Publication Status: Published in print
 Pages: 21
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/chem.200400928
 Degree: -

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Title: Chemistry – A European Journal
  Other : Chem. – Eur. J.
  Other : Chem. Eur. J.
Source Genre: Journal
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Publ. Info: Weinheim, Germany : VCH Verlagsgesellschaft
Pages: - Volume / Issue: 11 (6) Sequence Number: - Start / End Page: 1833 - 1853 Identifier: ISSN: 0947-6539
CoNE: https://pure.mpg.de/cone/journals/resource/954926979058