Intramolecular general acid catalysis of intramolecular nucleophilic catalysis of the hydrolysis of a phosphate diester
作者:Katherine W. Y. Abell、Anthony J. Kirby
DOI:10.1039/p29830001171
日期:——
faster than diphenyl phosphate. The reaction is accounted for in terms of intramolecular general acid catalysis by the ortho-CO2H of one salicyl group of the breakdown of the penta-covalent intermediate formed by the addition to phosphorus of the carboxylate group of the other. The general acid catalysis part of the process is unexpectedly inefficient.
磷酸双-2-羧苯基酯的二价阴离子(8)(在39°C下的半衰期为10.2分钟)水解。10比磷酸二苯酯快10倍。就分子内一般酸催化而言,该反应是由一个水杨基的邻-CO 2 H分解而来的,该水杨基是通过将另一羧酸盐基团的磷加成而形成的五价共价中间体的分解。该方法的一般酸催化部分出乎意料地效率低下。