A process for the preparation of silyl ketene acetals of the formula,
R₂C=C(OSiRnX3-n) (OZ) or
The process comprises contacting an alpha-ester of a carboxylic acid with an alkali metal in the presence of an excess of an organohalosilane, wherein the alpha-ester has the formula,
and the organohalosilane has the formula RnSiX4-n;
and facilitating reaction among the alpha-ester, the alkali metal and the organochlorosilane to form the silyl ketene acetal and an alkali metal halide or an alkali metal alkoxide.
一种制备式如下
硅酮
缩醛的工艺
R₂C=C(OSiRnX3-n) (OZ) 或
该工艺包括在过量的有机卤代
硅烷存在下,将
羧酸的α-酯与碱
金属接触,其中α-酯的式为
而有机卤代
硅烷的
化学式为 RnSiX4-n;
并促进α-酯、碱
金属和有机
氯硅烷之间的反应,以形成
硅酮
缩醛和碱
金属卤化物或碱
金属烷氧化物。