The following tetraarylsilanes,which contain two different kinds of radicals,have been synthesized by means of Wurtz reaction.They are triphenyl-ρ-tolylsilane,diphenyldi-ρ-tolylsilane and 2,7-dimethyl-9,9-diphenylsilicoxanthene,and the last one is a new heterocyclic compound containing silicon and oxygen as the hetero-atoms.When Wurtz reaction was applied to the synthesis of tetraarylsilanes with ortho-substituent in the aryl groups,only triarylchlorosilanes were obtained in low yield even at a higher reaction temperature.