Reactivity of an Aryl-Substituted Silicon−Silicon Triple Bond: Reactions of a 1,2-Diaryldisilyne with Alkenes

The reactivity of a bulky, diaryl-substituted disilyne, Ar−SiSi−Ar, was examined for the first time. Reaction of the disilyne with ethylene yielded an ethylene-bridged bis(silacyclopropane), which is interpreted as a further reaction product of the initially formed 1,2-disilacyclobutene species with ethylene. A cyclohexane fused with a 1,2-disilacyclobutene was obtained in the reaction with cyclohexene. In the reaction with 2,3-dimethyl-1,3-butadiene, a tricyclo derivative was isolated from the complex product mixture.