Reactive Sulfur Species: Kinetics and Mechanism of the Oxidation of Aryl Sulfinates with Hypochlorous Acid
作者:Hisanori Ueki、Garry Chapman、Michael T. Ashby
DOI:10.1021/jp906651n
日期:2010.2.4
The mechanism of oxidation of ArSO2− (PhSO2− and 5-sulfinato-2-nitrobenzoic acid = TNBO21−/2−) with HOCl/OCl− has been investigated using the kinetic method. In contrast to previous reports for PhSO2− (for which it was suggested that OCl− and not HOCl was the reactant), the reaction proceeds through a conventional pathway: nucleophilic attack by ArSO2− on HOCl with concomitant Cl+ transfer to give
ARSO的氧化机理2 -(PhSO 2 -和5-亚磺酸基-2-硝基苯甲酸= TNBO 2 1- / 2-与次氯酸/ OCL)-已经使用动力学法研究。与此相反,为PhSO以前的报告2 - (为此有人建议,OCL -而不是次氯酸是反应物),通过常规途径中的反应的进行:亲核攻击由ARSO 2 -上的HOCl伴随氯+转印,得到磺酰氯中间体(ArSO 2Cl),我们已经通过分光光度法对其进行了鉴定。值得注意的是,速率常数为次氯酸与ARSO反应2 -是量级10 9中号-1小号-1,比速率常数的相应硫醇盐更大,并且几乎是扩散控制。与此相反,速率常数为OCL的反应-与ARSO 2 -大约幅度要小的7个数量级。