Micellar catalysed chlorination of acetophenone by chloramine-T

The chlorination of acetophenone by chloramine-T cat has been catalysed by anionic micelle, sodium lauryl sulphate (NaLS). Though the order in cat is one, the order in acetophenone is fractional at lower concentration and becomes zero at higher concentration in the presence and absence of NaLS. This is probably due to the change in rate-determining step. At lower acetophenone concentration, the decomposition of enol-chlorinating species complex is rate-determining whereas at higher concentration, the formation of chlorinating species is rate determining. The graph ofk ₂ versus detergent concentration is sigmoidal and the positive co-operativityversus logD] graph is 1.11, indicating possible interaction between micelle and substrate.