Ion cyclotron resonance studies of alkylsilyl ions: V—The reactions of alcohols and ethers with the allyldimethylsilyl cation

Diallyldimethylsilane provides a source of the allyldimethylsilyl cation in the ion cyclotron resonance spectrometer; reaction of this cation with alcohols (ROH) produces adducts which decompose by loss of C 3 H 6 to yield the ion \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm Me}_2 \mathop {\rm S}\limits^{\rm + } {\rm i} - {\rm OR}} \right] $\end{document} . This elimination is thought to occur by a 1,5‐hydrogen shift, together with either stepwise or concerted silicon‐carbon bond cleavage. The corresponding aducts from ethers ROR 1 (R 1 ⩾R, R 1 ⩾Et) first lose (R 1 H˙) and then undergo the elimination described above.