Abstract

1,1,-Dimesityl-2- Z -neopentylidenesilirane( 1Z) reacted with nucleophiles to give ring opening adducts inserting at unexpected Si-C2 bond. This behavior can be explained by the unique structural feature of 1Z defined by its X-ray crystal analysis. A six electron participating concerted mechanism was suggested for the reaction with methanol and benzaldehyde. Palladium-catalyzed reaction of 1Z with acetylene and allene gave ring expansion products.

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