【摘要】 <正> 酰氧基硅烧和环氧化合物的开环反应可用于环氧树脂的改性.但对该反应的研究不多.我们发现5-叔丁基呋喃甲酸铬是酰氧基硅烷和环氧化合物开环反应的较好催化剂,认为有必要研究这一催化反应的动力学和反应机理.我们以三甲基乙酰氧基硅烷和环氧氯丙烷为模型化合物,研究了在5-叔丁基呋喃甲酸铬的存在下,以甲苯为溶剂,酰更多还原

【Abstract】 Reaction of ring cleavage between acyloxysilanes and epoxides has been used in the modification of epoxide resins. Kinetics of the reaction using trimethylacetoxysilane and epichlorohydrin as a model system, 5-tert-butyl-2-furancarboxylatochromium(III),(Cr(tBF)3), as catalyst, and toluene as solvent was studied. The results show that the reaction rate is of first order with respect to epoxide and the catalyst, and is zero order with respect to trimethylacetoxysilane. The corresponding specific rate constants and overall activation energy (8.87Kcal/mole) are also determined. These kinetic phenomena and IR spectra can be explained by a proposed mechanism which includes a fast reaction between Cr(tBF)3 and trimethylacetoxysilane leading to the formation of a new intermediate complex (see p. 319).更多还原