Mononuclear Co(III)-complex promoted phosphate diester hydrolysis: dependence of reactivity on the leaving group
作者:Michela Padovani、Nicholas H. Williams、Paul Wyman
DOI:10.1002/poc.770
日期:2004.6
omoted hydrolysis of a range of methyl aryl phosphate diesters was investigated at 37°C and I = 0.1 M (NaClO4). The pH–rate profile confirms that the aqua-hydroxy form of the complex is the only kinetically significant ionic form. At pH 6.9, all the reactions are first order in both diester and Co(III) complex. Plotting the second-order rate constant for Co(III) complex-promoted hydrolysis against
在37°C和I = 0.1 M(NaClO 4)下研究了TrpnCo(III)(OH)(OH 2)促进的一系列甲基芳基磷酸二酯的水解。pH-速率曲线证实了络合物的水-羟基形式是唯一在动力学上重要的离子形式。在pH 6.9时,所有反应均为二酯和Co(III)配合物的一级反应。绘制Co(III)配合物促进的水解相对于p K a的二级速率常数剩下的芳氧基的残基显示弯曲的LFER,表明限速步骤的变化。根据从限速水解到限速结合的变化或磷烷中间体的存在来讨论这一点。版权所有©2004 John Wiley&Sons,Ltd.