Chelating C4-bound imidazolylidene complexes via oxidative addition of imidazolium salts to palladium(0)

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Title: Chelating C4-bound imidazolylidene complexes via oxidative addition of imidazolium salts to palladium(0)
Authors: Krüger, Anneke
Kluser, Evelyne
Müller-Bunz, Helge
Neels, Antonia
Albrecht, Martin
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Date: Mar-2012
Abstract: Oxidative addition of donor-functionalised 4-iodoimidazolium salts to palladium(0) provides a selective route for the preparation of chelating abnormal N-heterocylic carbene complexes and enables the introduction of a variety of donor groups. The activation of the C4 position does not necessitate the imidazolium C2 position to be protected, leaving this site available for further modification. While metallation of the unsubstituted C2 position of the N-heterocyclic carbene ligand was unsuccessful when palladium was bound to the C4 carbon, sequential metallation of first the C2 position via transmetallation followed by C4–I oxidative addition afforded a dimetallic complex comprising two palladium centres bridged by a single NHC ligand.
Funding Details: Science Foundation Ireland
European Research Council
Type of material: Journal Article
Publisher: Wiley-VCH
Copyright (published version): 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Keywords: N-heterocyclic carbenePalladiumAbnormal bondingOxidative additionChelation
Subject LCSH: Carbenes (Methylene compounds)
Chelation therapy
DOI: 10.1002/ejic.201100940
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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