研究了芳基和4-苯基卤代甲酸烷基酯水解为苯基脲和苯酚或醇的动力学。酸碱催化,氘代溶剂同位素效应和活化熵为机理提供了充分的证据,表明机理从E 1cB的脲基脲基甲酸酯转变为B Ac 2的烷基酯。芳基酯的Hammett和Yukawa-Tsuno关系的参数以及与离去基团的p K a值的非线性Brönsted相关性与所提出的机理非常吻合。
Kinetics and mechanism of hydrolysis of 4-phenylallophanates
作者:Mohamed Mowafak Al Sabbagh、Michelle Calmon、Jean-Pierre Calmon
DOI:10.1039/p29840001233
日期:——
The kinetics of hydrolysis of aryl and alkyl 4-phenylallophanates to phenylurea and phenol or alchol are studied. Acid–base catalysis, deuterium solvent isotope effects, and entropy of activation provide good evidence for a changeover in mechanism from E1cB for aryl allophanates to BAc2 for alkyl esters. The parameters of the Hammett and Yukawa–Tsuno relationships for aryl esters and the non-linear
研究了芳基和4-苯基卤代甲酸烷基酯水解为苯基脲和苯酚或醇的动力学。酸碱催化,氘代溶剂同位素效应和活化熵为机理提供了充分的证据,表明机理从E 1cB的脲基脲基甲酸酯转变为B Ac 2的烷基酯。芳基酯的Hammett和Yukawa-Tsuno关系的参数以及与离去基团的p K a值的非线性Brönsted相关性与所提出的机理非常吻合。