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A bidentate NHC−alkenyl ruthenium(II) complex has been obtained on deprotonation of imidazolium salts with a N−CH 2 CH 2 X branch (X = OMe, Cl) followed by reaction with [RuCl 2 ( p -cymene)] 2 . Low-temperature NMR studies and intermediate trapping with BH 3 indicate the formation of a CH 2 CH−NHC carbene followed by the intramolecular activation of a vinyl sp 2 C−H bond on coordination to a ruthenium(II) center.
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Cariou et al. (2006) studied this question.
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