作者:Brian Capon、Maria De Nazare De Matos Sanchez
DOI:10.1016/s0040-4020(01)88634-8
日期:1983.1
whole series was studied in aqueous acetonitrile (cH2O= 8.33 M); 4b, 5b, and 6b were studied in aqueous acetonitrile (cH2O = 2.22 M) and 4b and 6b in water. Complete pcH-rate or pH-rate profiles were obtained for each reaction. The mechanisms of the hydronium-ion, hydroxide-ion and “water” catalysed reactions are discussed and compared to those for the breakdown of hemiacetals and the hydrolysis of orthoesters
已经研究了由乙酸二烷氧基烷基酯或乙烯酮缩醛产生的半原酸酯分解的动力学。研究了以下化合物:半甲甲酸二甲酯(1b),半甲甲酸二乙酯(2b),2-羟基-1,3-二氧戊环(3b),2-羟基-4,4,5,5-四甲基-1、3-二氧戊环,(4b),2-羟基-2-甲基-1,3-二氧戊环(5b)和2-羟基-2,4,4,5,5-五甲基-1,3-二氧戊环(6b)。整体在乙腈水溶液中研究系列(C H 2 O = 8.33 M);图4b,图5b,和图6B在乙腈水溶液中进行了研究(C ħ 2O = 2.22 M),以及水中的4b和6b。完整p Ç ħ对于每个反应,获得-rate或pH速率曲线。讨论了氢离子,氢氧根离子和“水”催化反应的机理,并将其与半缩醛的分解和原酸酯的水解进行了比较。