Intramolecular addition of transient silylium ions 1 to C≡C bonds provides access to vinyl cations 2 (see scheme; R=Me, Ph) which are remarkably stable at room temperature. The pronounced stabilization of the two cations can be explained by the well-documented hyperconjugative effect of two β-silyl substituents.
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Müller et al. (2000) studied this question.
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