Generation of a Silylene Complex by the 1,2-Migration of Hydrogen from Silicon to Platinum

An extraordinary downfield-shifted 29Si{1H} NMR signal is seen at δ=338.5 for the platinum silylene complex [(dippe)(H)Pt=SiMes2][MeB(C6F5)3] (2). This remarkably stable metal silylene complex was obtained from 1 in the first intramolecular 1,2-hydride migration from silicon to a transition metal. dippe=iPr2PCH2CH2PiPr2, Mes=2,4,6-Me3C6H2.