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Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, UK
E-mail: Simon.Aldridge@chem.ox.ac.uk
; Fax: +44 (0)1865 272690
; Tel: +44 (0)1865 285201
Chem. Commun., 2011,47, 2523-2525
DOI:
10.1039/C0CC05431C
Received
07 Dec 2010,
Accepted
05 Jan 2011
First published online
21 Jan 2011
Highly unsaturated mono(N-heterocyclic carbene) Ir(III) systems have been targeted via ligand abstraction protocols. Hydrogenation of Ir(IPr)(cod)Cl (1a) leads to the formation of the highly reactive (fluxional) trimer [Ir(IPr)(H)2Cl]3, while the related IMes system undergoes further C–H bond activation. Chloride abstraction from 1aprior tohydrogenation allows access to sources of the 12-electron [Ir(IPr)(H)2]+ fragment, which, in the absence of a suitable donor, dimerizes to give [{Ir(IPr)(H)(μ-H)}2]2+.
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