Formation of a siloxane bond via reactions of chlorosilanes with zinc oxide in aprotic media

It was shown that zinc oxide reacts with mono- and diorgano-substituted chlorosilanes RSiCl 3 and R 2 SiCl 2 (R = CH 3 or C 6 H 5 ) in aprotic media to afford poly(organosiloxanes) through intennediate organometallosiloxane compounds. By varying the conditions of hydrolytic and thermal decomposition of these intermediates, one can control the composition and structure of the final siloxane products. As a result, a completely soluble high-molecular-mass poly(methylosilsesquioxane) with M ∼ 25000 was first synthesized based on CH 3 SiCl 3 . The effect of experimental conditions on the composition and molecular mass characteristics of poly(organosiloxanes) was studied using GLC. GPC, and IR and 1 H ( 29 Si) NMR spectroscopy.