Reactions of Tetramesityldisilene with Acid Chlorides and Ketenes

摘要

Tetramesityldisilene (1) reacts with dimethylketene and disphenylketene by (2+2)cycloaddition to the carbonyl group to give 3-methylidene-1,2-disilaoxetanes, 4b and 4c. Acetyl and dimethylacetyl chlorides react with 1 with elimination of HC1 to give similar products, 4a and 4b, along with 1,1,2,2-tetramesityl-1-chlorodisilane (3). Nonenolizable acid chlorides react variously with 1: Heptafluorobutyryl chloride gives the (2+2) cycloaddition product, 11; trimethylacetyl chloride undergoes a slow reaction to give 3 and iso-butene; 3,4,5-trimethoxybenzoyl chloride produces 25% of a (2+4) cycloaddition product, 14.