POLYSILANES WITH REACTIVE SI-H FUNCTIONS Using the well known Wurtz coupling technique in heterogenous system, polyhydrosilanes copolymers with diphenyl sequences were synthesized. This work describes the possibility to maintain stable Si-H group and to obtain functional polysilanes. Also, the poysilane copolymer with reactive Si-H side groups was obtained through a homogenous coupling reaction of dichlorodiphenylsilane with dichloromethylsilane. The reaction was carried out in a tetrahydrofurane solution of sodium-potassium alloy complex with 18-crown-6 with a well defined composition of alkali metal ion pairs (Mt+/ crown ether, Mt - ) at –75 0C. The results were compared with those obtained by the heterogenous coupling reaction of the same monomers.