HYDROLYTIC POLYCONDENSATION OF ORGANOCHLO ROSILANES (REVIEW)

Achievements in the investigation of reactions of hydrolytic polyconde nsation and copolycondensation of organochlorosilanes with various fun ctionalities are reviewed, The use of these reactions in the synthesis of organosiloxanes with various compositions and structures is consid ered. The data on the reaction kinetics and the effects of reaction co nditions, reagent ratio, and various additives on the course of the re action are analyzed. Hydrochloric acid formed in the course of reactio n significantly affects the process and the product composition by rev erse reactions involving the Si-O bonds and the complex formation with water. The methods used for the synthesis of organosiloxanes must all ow for the features of mechanisms of hydrolytic polycondensation and c opolycondensation. The methods of synthesis and the reaction abilities of organosilanols as intermediates in the hydrolytic polycondensation and copolycondensation of organochlorosilanes are considered. The use of organosilanols in the synthesis of various organosiloxanes is disc ussed.