Abstract
The ring expansion reaction of ethyl cyclopropylideneacetate ( 1) with benzosilacyclobutenes proceeded smoothly in the presence of Ni(cod) 2-TOPP (tribiphenyl-2-yl phosphite) to give benzosilacycloheptenes in good yields. This formal σ bond metathesis reaction proceeded in a selective manner. The Ni-catalyzed reaction of 1 with biphenylenes was also examined.
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