Iridium, ruthenium, and palladium complexes containing a mesoionic fused imidazolylidene ligand

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Title: Iridium, ruthenium, and palladium complexes containing a mesoionic fused imidazolylidene ligand
Authors: Petronilho, Ana
Müller-Bunz, Helge
Albrecht, Martin
Permanent link: http://hdl.handle.net/10197/6563
Date: Jan-2015
Abstract: Imidazo[1,2-a]pyridine consisting of a pyridine fused to an imidazolium salt at the imidazolium N1–C2 bond and hence protected from forming normal imidazole-2-ylidene complexes undergoes selective activation of the C5–H bond with Ag2O, i.e. at the imidazolium carbon that is proximal to the pyridine nitrogen. While the silver carbene complex is unstable, transmetallation with [IrCp*Cl2]2, [RuCl2(cym)]2, and [PdCl(allyl)]2 afforded stable mesoionic carbene complexes. Two iridium(III) complexes containing one fused carbene ligand and one palladium(II) complex containing two carbene ligands at the metal centre were structurally characterized. The absence of substituents adjacent to the carbene carbon prevents wingtip group activation, and it imparts a reduced stability of the complexes in particular under (mildly) acidic conditions.
Funding Details: European Research Council
Science Foundation Ireland
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2014 Elsevier
Keywords: N-heterocyclic carbeneMesoionicFused abnormal carbeneRuthenium(II)Iridium(III)Palladium(II)
DOI: 10.1016/j.jorganchem.2014.03.021
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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