Tri:organo-mono:chloro-silane cpds. prodn. - by reacting hexa:organo-di:siloxane cpds. with hydrogen chloride under pressure, useful for silicone prodn.

摘要

Prodn. of triorgano-monochloro-silanes (I) of the formula R3SiCl by reacting hexaorganodisiloxanes (II) of the formula (R3Si)20 (in which the R gps. independently are opt. substd. 1-12C hydrocarbyl gps.) with HCl is carried out at elevated HCl pressure. Pref. (II) is hexamethyldisiloxane (IIA). Pref. the HCl pressure is 1.1-40 bar and the reaction temp. -15 to +20 deg.C. Quantitative reaction takes place without addn. of dehydrating salts (I) are useful starting materials for silicones. In an example, a 4 l autoclave was charged at room temp. with 1000 g (IIA) and HCl to a pressure kept at 15 bar for 3 hr. The lower phase consisted of concn. HCl, whilst the upper phase contained 99.4% Me3SiCl.