Abstract
The kinetics of the oxidation of substituted 4-oxoacids by N-bromosaccharin (NBSac) has been studied in aqueous acetic acid medium at 30 °C. The reactions follow first-order kinetics in the 4-oxoacids, NBSA and H+. Variation in the ionic strength has no effect on the reaction rate. The order of reactivity among the studied 4-oxoacids is: 4-methoxy > 4-methyl > 4-phenyl > 4-H > 4-Cl > 4-Br > 3-NO2. The effect of changes in the electronic nature of the substrate revealed that there is a development of positive charge in the transition state. The activation parameters were computed from an Arrhenius plot. Based on the kinetic results, a suitable mechanism has been proposed. The mechanism involves the attack of the oxidizing species hypobromous acidium ion, (H2O+Br).
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