From experiments on the addition of :SiMeX (X = H, Cl, Me) to Buta-1,3-diene, it is concluded that the main cyclic adduct in each case results from initial 1,2-addition to form a vinylsilacyclopropane followed by a 1,3-silyl shift, rather than Si–C bond rupture.
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Clarke et al. (1988) studied this question.