POLYMERIC ORGANOSILICON SYSTEMS .20. SYNTHESIS AND SOME REACTIONS OF FUNCTIONALIZED ORGANOSILICON POLYMERS, POLY[(SILYLENE)PHENYLENES]

Poly[p- and m-(methylsilylene)phenylenes] were prepared from the react ion of dichloromethylsilane with p- and m-dilithiobenzene in 11% and 3 1% yields, respectively. The reaction of dichlorophenylsilane with p-d ilithiobenzene afforded poly[p-(phenylsilylene)phenylene] in 58% yield , while treatment of bis(chlorosilyl)benzene with p-dilithiobenzene ga ve poly[p-(silylene)phenylene] in 15% yield. These polymers readily re act with olefins and acetylenes in the presence of a platinum catalyst to give hydrosilation products. Thermal behavior of the polymers and poly[p-(dimethylsilylene)phenylene] prepared from p-phenylenedimagnesi um dibromide with dichlorodimethylsilane was also investigated by ther mogravimetric analysis in air as well as in a nitrogen atmosphere.