摘要:
A method of producing 1,3 bis-(hydroxyaryl) tetraorganodisiloxanes of the general formula WHERE R is alkyl, CONSISTING IN THAT A DIORGANOHYDROSILYL HALOPHENOL ESTER IS REACTED WITH MAGNESIUM IN AN ORGANIC SOLVENT MEDIUM. Then the solvent is distilled off, the reaction mixture is heated to a temperature of 150*-180*C, is treated with a 10-15 percent solution of a mineral acid, thus isolating diorganohydroxilylsubstituted phenols of the general formula WHERE R is alkyl. The obtained compounds of the above-mentioned general formula are subjected to hydrolysis in the presence of a catalyst such as powdered copper, powdered nickel, powdered iron, an organic or inorganic base, hydroxide or alcoholate of alkali metals, or are subjected to alcoholysis in the presence of the above-said catalysts followed by hydrolysis. After that condensation of the diorganohydroxysilylphenols is effected under a vacuum at a temperature of 35*-60*C and a residual pressure of 1-2 mm Hg. The 1,3 bis-(hydroxyaryl) tetraorganodisiloxanes are used for synthesis of polymers having a high terminal stability.
摘要:
Carbofunctional diols of the disiloxane series are prepared by reacting organohalosilanes with unsaturated alcohols in the presence of a tertiary amine as hydrogen chloride acceptor, and in an organic solvent medium, subjecting the resultant alkenyloxydiorganosilanes to polymerization in the presence of a hydrosilylation catalyst, boiling the mixture of siloxyalkanes thus obtained with an alkaline solution, and thereafter separating the desired product.