Micellar Catalyzed Chlorination of Phenol by Chloramine-T

摘要

The chlorination of phenol by chloramine-T (CAT) has been catalysed by cetyl pyridinium bromide (CPBr). The reaction was followed titrimetriclly in acetic acid-water (20% v/v) medium at 313 K. The plot of observed rate constant vs. [CAT] proves the first order dependency of the reaction with respect to [CAT] both in presence and absence of the micelle. Though the rate with respect to CAT is one, the orders in phenol are fractional and zero in the presence and adsence of the surfactant respectively. The rate of reaction increases with increase in concentration of surfactant. The positive cooperativity obtained indicates the possible interactio between micelle and substrate.