The X-ray Structure of a Vinyl Cation

摘要

Vinyl cations, the dicoordinated unsaturated analogues of trivalent carbenium ions, were first detected by Grob and co-workers in the early 1960s in solvolysis reactions of a-aryl vinyl halides. In the 1970s numerous investigations established vinyl cations as reaction intermediates in solvolysis reactions of activated alkenyl halides and in reactions of electrophiles with alkynes. The direct NMR detection of vinyl cations under superacidic reaction conditions at temperatures below -100 ℃ was achieved in the early 1990s and provided important information about their electronic structure. We report herein the X-ray structure of the β-silyl substituted vinyl cation 1, which provides the first direct experimental structural information about this important class of reaction intermediates.