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• W2155279170 abstract "The kinetics and mechanism of chromic acid oxidation of L-sorbose in the presence and absence of picolinic acid (PA) have been studied under the conditions, [L-sorbose]T » [PA]T » [Cr(VI)]T, at different temperatures. In the absence of PA, the monomeric chromic acid undergoes esterification with the substrate followed by the acid catalysed redox decomposition of the Cr(VI)-substrate ester through glycol splitting to formaldehyde and the lactone of C5-aldonic acid and Cr(IV) which subsequently participates in the faster reactions. In the presence of PA, the Cr(VI)-PA complex produced in a pre-equilibrium step experiences a nucleophilic attack by the substrate to produce a ternary complex which decomposes through glycol splitting giving rise to the organic products and Cr(IV)-PA complex. Both the uncatalysed and PA-catalysed paths show the first-order dependence on [L-sorbose]T and [Cr(VI)]T. The PA-catalysed path is first-order in [PA]T and it shows a fractional order in [H+]. The uncatalysed path shows a second-order dependence on [H+]. In the presence of the surfactants like N-cetylpyridinium chloride (CPC, a cationic surfactant) and sodium dodecyl sulfate (SDS, an anionic sulfate), the reaction orders remain unchanged. CPC has been found to inhibit both the uncatalysed and PA-catalysed paths while SDS shows the rate accelerating effect for both the uncatalysed and PA-catalysed paths. The observed micellar effects have been rationalised by considering the distribution of the reactants between the micellar and aqueous phases in terms of the proposed reaction mechanism." @default.
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• W2155279170 date "2004-04-01" @default.
• W2155279170 modified "2023-09-27" @default.
• W2155279170 title "Micellar Effect on the Reaction of Chromium(VI) Oxidation of L-Sorbose in the Presence and Absence of Picolinic Acid in Aqueous Acid Media: A Kinetic Study" @default.
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• W2155279170 doi "https://doi.org/10.1002/jccs.200400062" @default.
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