Oxidation of methylpentoses by sodium N-chlorobenzene sulphonamide in alkaline medium: A kinetic and mechanistic study

被引：0

作者：

Rangappa, KS ^{[1
]}

Raghavendra, MP

Mahadevappa, DS

Rai, KML

Gowda, DC

机构：

[1] Univ Mysore, Dept Studies Chem, Mysore 570006, Karnataka, India

[2] Georgetown Univ, Med Ctr, Dept Biochem & Mol Biol, Washington, DC 20007 USA

来源：

PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES | 1998年 / 110卷 / 01期

关键词：

kinetics; oxidation; chloramine-B; methylpentoses; NaOH medium;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Kinetics and mechanism of oxidation of three methylpentoses, namely D-fucose, L-fucose and L-rhamnose with sodium N-chlorobenzene-sulphonamide (chloramine-B or CAB) in alkaline medium were studied at 313 K. The rate law, rate = k [CAB] [S] [HO-] was observed. Benzenesulphonamide and chloride ions, the reduced products of the oxidant had no effect on the reaction rate. The rate increased with increase in ionic strength of the medium and the dielectric effect was negative. Proton inventory studies were made in H2O-D2O mixtures. HPLC analysis of products indicated a mixture of aldonic acids in varying proportions. A mechanism involving the furanosidic ringform of methylpentoses which preferentially reacts with CAB in the rate limiting step is suggested.

引用

页码：53 / 64

页数：12

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