1,2-CYCLOADDITION REACTIONS OF DIHALOCARBENES (CCL2, CBR2, CF3 CCL) TO SOME PI-BONDED ORGANOSILANES UNDER PHASE-TRANSFER CATALYTIC CONDITIONS

The dihalocarbenes of the type :CXY (X = Y = Br, Cl; X not equal Y = C F3, Cl) have been generated by the reaction of the corresponding halof orm and aqueous potassium hydroxide solution in the presence of phase transfer catalysts like 18-Crown-6 and Cetrimide(R). 1,2-Cycloaddition reactions of the carbenes have been carried outwith tetraorganosilane s having one or two allyl or vinyl groups, where the addition of carbe nes takes place easily on both the allyl functionalities irrespective of the methyl or phenyl groups attached with silicon. Whereas in the c ase of vinylsilanes, similar addition reactions are found to be partia l.