Effect of substitution of oxygen by sulfur in the nonleaving group of a carbonate: kinetics of the phenolysis and benzenethiolysis of<i>S</i>-methyl aryl thiocarbonates
作者:Enrique A. Castro、Margarita Aliaga、José G. Santos
DOI:10.1002/poc.1192
日期:2007.8
are studied kinetically. The Brønsted plots (log kNversus nucleophile basicity) are linear for all reactions. The Brønsted slopes for 1 and 2 are, 0.51 and 0.66 (phenolysis) and 0.55 and 0.70 (benzenethiolysis), respectively. These values suggest a concerted mechanism for these reactions, as found in the corresponding carbonates. Namely, substitution of OMe by SMe in the nonleaving group does not change
动力学研究了S-甲基4-硝基苯基硫代碳酸酯(1)和S-甲基2,4-二硝基苯基硫代碳酸酯(2)在水中的酚解和苯硫解。对于所有反应,布朗斯台德图(log k N与亲核试剂碱性之间的关系)是线性的。1和2的Brønsted斜率分别为0.51和0.66(酚醛)和0.55和0.70(苯硫解)。这些值表明了这些反应的协调机制,如在相应的碳酸盐中发现的。即,用S代替O Me我在非离开小组中并没有改变机制。版权所有©2007 John Wiley&Sons,Ltd.