The protodesilylation of either 1-dimethyl(phenyl)silyl-3-trimethylsilypropene (15) or its isomer, 1-trimethylsilyl-3-dimethyl(phenyl)silylpropene (16), gave the same, ca. 4 : 1, mixture of allylsilanes, 3-dimethyl(phenyl)silylpropene (18) and 3-trimethylsilylpropene (19), showing that a cationic intermediate (17) is involved in both reactions.
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