Combinative one-pot Si–Si/Si–O dehydrocoupling of hydrosilanes with alcohols (1:1.5 mole ratio), mediated by a mixture of AgNO3–AuCl3 (100/1 mole ratio) rapidly produced poly(alkoxysilane)s in reasonably high yield. The addition of small amount of gold complex to the reaction mixture effectively accelerated the coupling reaction compared to the reaction rate with AgNO3 alone. The hydrosilanes include p-X-C6H4SiH3 (X = H, CH3, OCH3, F), PhCH2SiH3, and (PhSiH2)2. The alcohols include MeOH, EtOH, iPrOH, PhOH, and CF3(CF2)2CH2OH. The weight average molecular weight and polydispersity of the poly(alkoxysilane)s were in the range of 1,600∼8,000 Dalton and 1.4∼3.5, respectively. The dehydrocoupling reactions of phenylsilane with ethanol (1:3 mole ratio) in the presence of the Ag–Au complexes gave only triethoxyphenylsilane.
在 AgNO3-
AuCl3 混合物(100/1 摩尔比)的介导下,氢
硅烷与醇(1:1.5 摩尔比)的一锅式 Si-Si/Si-O 脱氢偶联反应以相当高的产率快速生成了聚(烷氧基
硅烷)。与单独使用 AgNO3 的反应速率相比,在反应混合物中加入少量
金络合物可有效加速偶联反应。氢
硅烷包括 p-X-C6H4SiH3(X = H、
CH3、O 、F)、PhCH2SiH3 和 (PhSiH2)2。
醇类包括 MeOH、EtOH、iPrOH、PhOH 和
CF3(
CF2)2CH2OH。聚(烷氧基
硅烷)的重量平均分子量和多分散性分别在 1 600 ∼ 8 000 道尔顿和 1.4 ∼ 3.5 之间。在 Ag-Au 复合物存在下,苯基
硅烷与
乙醇(1:3 摩尔比)的脱氢偶联反应只得到三乙氧基苯基
硅烷。