Cationic carbene complexes of nickel(II)

Abstract
The nickel acetylide (1) reacts with alcohols in the presence of perchloric acid to give stable cationic alkoxy-carbene complexes (2), the 1H n.m.r. spectra of which show the presence of two conformational isomers; deprotonation with triethylamine occurs at the carbene methyl group.
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