Kinetic measurements of the oxidation of divalent organic sulfur compounds by N-chlorosuccinimide in acetonitrile–water mixture at constant [H+] show that the reaction is first order in both the oxidant and the organic sulfur compound. While the rate of oxidation of methyl phenyl sulfide or diphenyl sulfide increases with [H+], that of phenylmercaptoacetic acid decreases. Therefore it has been concluded that protonated N-chlorosuccinimide and N-chlorosuccinimide are the active oxidising species in the oxidation of aromatic sulfides and N-chlorosuccinimide is the active species in the case of phenylmercaptoacetic acids. Structure–reactivity correlations for the oxidation of aryl methyl sulfides, diaryl sulfides and arylmercaptoacetic acids result in a high negative reaction constant, providing evidence for the formation of a chlorosulfonium ion intermediate.
双价
有机硫化合物在
乙腈-
水混合物中与N-
氯代琥珀
酰亚胺的氧化动力学测量显示,在恒定的[H+]下,该反应对于氧化剂和
有机硫化合物均为一级反应。尽管甲基苯
硫化物或二苯
硫化物的氧化速率随[H+]增加而增加,苯基
巯基乙酸的氧化速率却降低。因此,可以得出结论,质子化的N-
氯代琥珀
酰亚胺和N-
氯代琥珀
酰亚胺是芳香族
硫化物氧化反应中的活性氧化种,而在苯基
巯基乙酸的情况下,N-
氯代琥珀
酰亚胺是活性种。芳基甲基
硫化物、二芳基
硫化物和芳基
巯基乙酸的氧化反应中,结构-反应性相关性导致高度负反应常数,这为
氯磺onium离子中间体的形成提供了证据。