Activation of the Si−H bond is observed for 1, which is obtained from the reaction of triallylborane with bis(dimethylsilyl)ethyne, as the result of the neighboring three-coordinate boron atom [Eq. (1)]. Compound 1 undergoes facile intramolecular hydrosilylation without a catalyst (!) to give 2.
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Wrackmeyer et al. (1999) studied this question.
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