New Approach to the Synthesis of Linear and Cyclic Vinyl(alkoxy)siloxanes

摘要

Main products of the reaction of vinyltrichlorosilane VinSiCl(3) with DMSO in the medium of tetra-(alkoxy)silane are linear siloxanes (RO)(3)Si[OSiVin(OR)]OSi(OR)(3), RO[Vin(RO)SiO] (n) Si(OR)(3) (R = Me, Et, n = 0-2) and the hitherto unknown cyclic siloxanes [Vin(RO)SiO](m)[(RO)(2)SiO](4-m) (m = 1-3) formed in the ratio of 70 : 30%. A tentative scheme of their formation is suggested with participation of the products of the alkoxy groups exchange between vinyl(alkoxy)dichloro-, vinyldi(alkoxy)chloro-, trialkoxychloro-, and dialkoxy-dichlorosilanes.