Kinetics and mechanism of the reaction between dibenzyl triselenocarbonate and oxygen-bases
作者:F.A. Devillanova、G. Verani、L. Henriksen
DOI:10.1016/0040-4020(80)85061-7
日期:1980.1
The base-induced solvolysis of dibenzyl triselenocarbonate in DMSO/water (4:1) has been studied by UV spectrophotometric measurements under pseudo-first order conditions, using KOH, Me4NOH, Bu4nNOH and Bu4nNHCO3 as bases. The reaction is first order with respect to the substrate as well as to the base. Rate constants and activation parameters for the four bases indicate that the rate determining step
使用KOH,Me 4 NOH,Bu 4 n NOH和Bu 4 n NHCO 3作为碱,通过伪一级反应条件下的紫外分光光度法研究了碱诱导的二硒代三碳酸二苄酯在DMSO /水中的溶剂分解(4:1)。。相对于底物和碱,反应是一级反应。四个碱基的速率常数和激活参数表明速率确定步骤是碱基(作为离子对)在基质上的亲核攻击。由于强烈的亲核性硒酸根类物质,快速反应可能会跟随这一缓慢的步骤。在实验证据的基础上提出了一种试探性的机制。