Institutions | About Us | Help | Gaeilge
rian logo


Mark
Go Back
Iridium, ruthenium, and palladium complexes containing a mesoionic fused imidazolylidene ligand
Petronilho, Ana; Müller-Bunz, Helge; Albrecht, Martin
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. European Research Council Science Foundation Ireland
Keyword(s): N-heterocyclic carbene; Mesoionic; Fused abnormal carbene; Ruthenium(II); Iridium(III); Palladium(II)
Publication Date:
2015
Type: Journal article
Peer-Reviewed: Unknown
Language(s): English
Institution: University College Dublin
Publisher(s): Elsevier
First Indexed: 2015-05-16 05:30:17 Last Updated: 2018-10-11 15:33:08