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American Chemical Society, Organometallics, 19(30), p. 5208-5213, 2011

DOI: 10.1021/om2005782

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Synthesis of a Square-Planar Rhodium Alkylidene N-Heterocyclic Carbene Complex and Its Reactivity Toward Alkenes

Journal article published in 2011 by Laura Palacios, Xiaowei Miao, Andrea Di Giuseppe ORCID, Simon Pascal, Carmen Cunchillos, Ricardo Castarlenas, Jesús J. Pérez-Torrente, Fernando J. Lahoz, Pierre H. Dixneuf, Luis A. Oro
This paper is available in a repository.
This paper is available in a repository.

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Abstract

The first rhodium alkylidene square-planar complex stabilized by an N-heterocyclic carbene ligand, RhCl(═CHPh)(IPr)PPh3 (2; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-carbene), has been prepared by reaction of RhCl(IPr)(PPh3)2 (1) with phenyldiazomethane and its dynamic behavior in solution studied. Treatment of 2 with alkenes results in the formation of the η2-olefin complexes RhCl(η2-CH2═CHR)(IPr)PPh3 (3, R = H; 4, R = Ph; 5, R = OEt) and new olefins arising from the coupling of the alkylidene with the alkenes, likely via a metallacyclobutane intermediate.