A Study of Substituent Effect on the Oxidative Strengths of N-Chloroarenesulphonamides: Kinetics of Oxidation of Leucine and Isoleucine in Aqueous Acid Medium
作者:Mahesha Shetty、B. Thimme Gowda
DOI:10.1515/znb-2004-0110
日期:2004.1.1
Abstract To study the variation of oxidative strengths of N-chloro-arenesulphonamides with substitution in the benzene ring, six mono- and five di-substituted N-chloro-arenesulphonamides are employed as oxidants for studying the kinetics of oxidation of two neutral amino acids, L-leucine and Lisoleucine in aqueous acid medium. The N-chloro-arenesulphonamides studied are of the constitution: ArSO2NaNCl·H2O
摘要 为了研究苯环取代的 N-氯代芳烃磺酰胺氧化强度的变化,以六个单取代和五个二取代的 N-氯代芳烃磺酰胺作为氧化剂,研究了两个中性氨基酸的氧化动力学, L-亮氨酸和赖氨酸在酸性水溶液中。研究的 N-氯芳烃磺酰胺的组成为:ArSO2NaNCl·H2O(其中 Ar = C6H5, 4-CH3C6H4, 4-C2H5C6H4, 4-FC6H4, 4-ClC6H4, 4-BrC6H4, 2,3-(CH3)2C6H3 2,4-(CH3)2C6H3、2-CH3-4-ClC6H3、2,4-Cl2C6H3 和 3,4-Cl2C6H3)。反应显示 [氧化剂] 中的二级动力学、[氨基酸] 中的分数级以及对 [H+] 的反向依赖性。添加氧化剂的还原产物或介质离子强度的变化对氧化速率没有显着影响。考虑了一种双通路机制来解释实验结果。氧化剂的有效氧化物质是不同形式的Cl+。因此,N-氯代芳烃磺酰胺的氧化强度取决于从它们中释放出