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Kinetics and Mechanism of Micellar Catalyzed Oxidation of Dextrose by N-Bromosuccinimide in H2SO4 Medium
Author(s) -
Minu Singh
Publication year - 2014
Publication title -
international journal of carbohydrate chemistry
Language(s) - English
Resource type - Journals
eISSN - 1687-935X
pISSN - 1687-9341
DOI - 10.1155/2014/783521
Subject(s) - chemistry , stoichiometry , n bromosuccinimide , arrhenius equation , catalysis , order of reaction , activation energy , kinetics , reaction mechanism , acrylonitrile , reaction rate , rate equation , sulfuric acid , chemical kinetics , inorganic chemistry , reaction rate constant , organic chemistry , halogenation , copolymer , polymer , physics , quantum mechanics
Kinetics and mechanism of micellar catalyzed N-bromosuccinimide oxidation of dextrose in H2SO4 medium was investigated under pseudo-first-order condition temperature of 40°C. The results of the reactions studied over a wide range of experimental conditions show that NBS shows a first order dependence, fractional order, on dextrose and negative fractional order dependence on sulfuric acid. The determined stoichiometric ratio was 1 : 1 (dextrose : N-bromosuccinimide). The variation of Hg(OAC)2 and succinimide (reaction product) has insignificant effect on reaction rate. Effects of surfactants, added acrylonitrile, added salts, and solvent composition variation have been studied. The Arrhenius activation energy and other thermodynamic activation parameters are evaluated. The rate law has been derived on the basis of obtained data. A plausible mechanism has been proposed from the results of kinetic studies, reaction stoichiometry, and product analysis. The role of anionic and nonionic micelle was best explained by the Berezin’s model

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