The title reaction was studied in solutions of polyoxyethylene(23) lauryl ether (Brij-35) at premicellar and micellar concentrations. The reaction rate goes through a maximum, which appears at a concentration close to the critical micellar concentration (cmc). The results can be rationalized by an extension of previous models on premicellar and micellar effects on the kinetics of reactions. This model can explain similar results from other groups.