This reaction is not terminated by the stage of formation of compound I: With rising temperature the reaction mixture can yield 1, 3-bis (diphenylchlorosilyl)-2, 2, 4, 4- tetraphenylcyclodisilazane (IV), the crystal structure of which has been studied elsewhere [4]. Fractional recrystallization of the reaction products of 2, 2, 4, 4, 6, 6- hexaphenylcyclotrisilazane and diphenyldichlorosilane from benzene yielded colorless ...