Kinetics and mechanism of oxidation of methionine by chromium(VI): Edta catalysis

被引：0

作者：

Meenakshisundaram, S ^{[1
]}

Vinothini, R ^{[1
]}

机构：

[1] Annamalai Univ, Dept Chem, Annamalainagar 608002, Tamil Nadu, India

来源：

CROATICA CHEMICA ACTA | 2003年 / 76卷 / 01期

关键词：

kinetics; oxidation; edta catalysis; methionine; chromium(VI);

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The kinetics of the oxidation Of DL-methionine to sulfoxide by Cr-VI has been studied in aqueous acetic acid in the presence of sodium salt of ethylenediaminetetraacetic acid (edta). It appears that Cr-VI-edta is the active electrophile. The low dielectric constant of the medium favours the reactivity. Ionic strength and Mn-II have no significant effect on the conversion. The ratio k(D2O)/k(H2O) approximate to I does not seem to indicate any significant solvent isotope effect. Highly negative DeltaS(#) values indicate a structured transition state. A ternary intermediate has been envisaged for describing the enhanced reactivity.

引用

页码：75 / 80

页数：6

共 41 条

[1] CHROMIC ACID OXIDATION OF OXALIC ACID - KINETIC INVESTIGATION OF UNCATALYSED OXIDATION OF OXALIC ACID BY CHROMIC ACID .1. [J].