Kinetic study of oxidation of galactose by N-bromo phthalimide in the presence of cationic micelle in acidic medium

Abstract

The kinetics of micellar catalyzed oxidation of galactose by N-bromophthalimide was studied in the presence of acidic medium at 308 K. The oxidation reaction exhibits first-order kinetics with respect to oxidant (N-bromophthalimide), fractional order with respect to substrate (galactose) and positive fractional order with respect to HClO 4 on the rate of reaction. The rate of the reaction increased with decreasing the dielectric constant of the medium. With a progressive increase in the concentration of CTAB, the rate of reaction increased and after reaching peak k obs , decreased at higher concentrations of CTAB. There catalytic roles are best explained by Berezin's model. The influence of salts on the reaction rate was also studied. The various activation parameters have been calculated. The rate constant and binding constant with the surfactant have also been evaluated. A suitable mechanism consistent with the experimental findings has been proposed.

Surfactant for better tomorrow: applied aspect of surfactant aggregates from laboratory to industry

“…(d) A greater attractive interaction between reverse micelle and the cationic head group of lipopathic oxidant established for the rate enhancement [94]. (e) The partitioning mode leads to higher local concentration of both the reactants at the micelle water surface for which preferential rate enhancement in the micellar phase was noticed [95].…”