In the presence of a palladium complex, 1,1-dimethyl-1-silacyclobutane reacts smoothly with dimethyl acetylenedicarboxylate to give 1,1-dimethyl-2,3-bis(methoxycarbonyl)-1-silacyclohex-2-ene in quantitative yield. Other silacyclobutanes react similarly with various acetylenes to give silacyclohexene derivatives.
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Sakurai et al. (1975) studied this question.
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