Process for producing octaphenyltetracyclosiloxane

Details Process for producing octaphenyltetracyclosiloxane Process for producing octaphenyltetracyclosiloxane

C - Chemistry, Metallurgy

07

F

402/28, 260/445.

C07F 7/18 (2006.01) C07F 7/21 (2006.01) C08G 77/04 (2006.01) C08G 77/18 (2006.01)

Patent

CA 1039735

ABSTRACT OF THE DISCLOSURE A process for producing octaphenyltetracyclo- siloxane comprising contacting diphenyldihalogensilane with an alcohol so as to completely alkoxylate the silane, removing most of the acid that is formed during such alkoxylation reaction by heating the mixture, taking the substantially alkoxylated silane which is preferably made neutral and adding to it a mixture of water, a water- immiscible organic solvent, adding to this mixture an alkaline arrangement catalyst and heating the resulting mixture from 40 to below 80°C so as to form the desired product. During this heating step most of the alcohol and water by-products are removed. As soon as this is done, the alkaline rearrangement catalyst and the mixture may be neutralized and the mixture heated at elevated temperatures so as to azeotrope the remaining water out with the water- immiscible organic solvent.

207338

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