The effect of leaving group variation on reactivity in the dissociative hydrolysis of aryl 3,5-dimethyl-4-hydroxybenzenesulfonates
作者:Giorgio Cevasco、Sergio Thea
DOI:10.1039/a703645k
日期:——
The hydrolysis of aryl esters of 3,5-dimethyl-4-hydroxybenzenesulfonic acid in moderately to strongly alkaline aqueous solution follows a dissociative pathway with the participation of a sulfoquinone (thioquinone dioxide) intermediate. Brønsted-type correlation between log kapp and pKLG and inspection of the effective charge changes involved in the reaction further support the ElcB mechanism. From
3,5-二甲基-4-羟基苯磺酸的芳基酯在中度至强碱性水溶液中的水解遵循磺化醌(二氧化硫醌)中间体的分解途径。log k app和p K LG之间的布朗斯台德类型相关性以及反应中涉及的有效电荷变化的检查进一步支持了ElcB机制。从该研究和先前的研究看来,羟基芳烃磺酸的芳基酯似乎比相应的羟基芳烃羧酸酯更倾向于通过解离途径水解。