Steric and electronic control of the dissociative hydrolysis of 4-hydroxybenzoate esters
作者:Sergio Thea、Giuseppe Guanti、Nasrin Kashefi-Naini、Andrew Williams
DOI:10.1039/c39830000529
日期:——
The introduction of two ortho methyl substituents changes the propensity of 4-hydroxybenzoates to react via the oxo-ketene pathway by nearly one million-fold; the increased reactivity of the hindered conjugate base over that of the parent is assigned to enhanced internal nucleophilicity of the 4-oxyanion.
两个邻甲基取代基的引入使4-羟基苯甲酸酯通过氧代-乙烯酮途径反应的倾向改变了近一百万倍。与母体相比,受阻共轭碱基的反应性增加,是由于4-氧阴离子的内部亲核性增强。