BASE-CATALYZED HYDRATION OF METHYLCHLOROT RISTANNANES AND METHYLCHLOROTETRASILANES WITH TRIALKYLSTANNANES TO PREPARE METHYLHYDROCHLOROTRISILANES AND METHYLHYDROCHLOROTETRASILANES

The Lewis-base catalysed hydrogenation of methylchlorodisilanes with t rialkylstannanes is also applicable to higher methylchlorooligosilanes without cleavage of the Si-Si bonds. In this way it was possible to p repare methylchlorohydrogentri- and tetrasilanes. Using trisilanes wit h a > SiClMe middle group the first hydrogenation takes place exclusiv ely at this silicon atom under formation of a > SiHMe group. By hydrog enation with trialkylstannanes it is possible to modify the methylchlo rooligosilanes obtained by the disproportionation of methylchlorodisil anes into precursors for polymers. With Me(3)SnH as hydrogenation agen t the Me(3)SnCl formed can easily be removed and re-used (E. Hengge, C h. Grogger, F. Uhlig, G. Roewer, U. Herzog and U. Patzold, Monatsh. f. Ch., 126 (1995) 549).