Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 691, Issue 3, Pages 433-443Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2005.09.010
Keywords
nickel(II); phosphine; imidazolium; bifunctional ligands; Kumada-Corriu reaction
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Zwitterionic Ni(II) complexes of type NiX3(NCN+), (NCN+ = 1-(2-diphenylphosphinoethyl)-3-(2,4,6-trimethylphenyl)imidazolium and X = Cl, 6; Br, 7), have been prepared by addition of NCN+ bromide (1a) or tetrafluoroborate (1b) to NiX2L, and characterised by X-ray crystallography. They have been used as catalytic precursors in the Kumada-Corriu coupling reaction between phenylmagnesium chloride and 4-chloroanisole, yielding high catalytic activities. Stoechiometric deprotonation investigations did not provide clear evidence for the formation of coordinated carbene species. (c) 2005 Elsevier B.V. All rights reserved.
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