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Crystallographic analysis demonstrates the first solid-state structure of a vinyl cation, highlighting the stabilizing role of beta-silicon hyperconjugation.
Thermodynamic stabilization by two β-silyl substituents and essentially nonnucleophilic reaction conditions are prerequisites for the preparation of the first structurally well-characterized vinyl cation 1 (see structure). The occurrence of β-SiC hyperconjugation in 1 is indicated by unusually long SiCβ bonds.
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Müller et al. (2004) studied this question.
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