Acetylene → 1-Ethyl-N,N,N',N',N'',N''-hexamethylsilanetriamine

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A two liter stirred batch reactor was purged with nitrogen gas and thereafter charged with 840 g (5.22 moles) of tris(dimethylamino)silane and 5 ppm hexachloroplatinic acid. The reactor was then pressurized to approximately 5 psig with nitrogen gas and heated to approximately 250° C. The acetylene inlet feed was started and maintained at 100 psig. The reaction temperature was maintained at 250° C. After four hours the acetylene flow was stopped, the reaction mix cooled and the reaction products analyzed. Vinyltris(dimethyl)amino)silane was the single major product at 90% of theoretical. Ethyltris(dimethylamino)silane and 1,2-bis(trisdimethylamino)silylethane by-products were formed in amounts less than 0.5% each. Vinyltris(dimethylamino)silane polymer was also formed in an amount of 7-8%.

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