BASE-CATALYZED-HYDROLYSIS OF AEROSOL-OT IN AQUEOUS AND AQUO-DIOXANE MEDIA

The OH- ion catalyzed hydrolysis of AOT and sodium mono-methyl succina te in aqueous and aquo-dioxane media has been studied. The second-orde r rate constant for the former has been found to be nearly ten times s lower than that of the latter. At AOT concentrations above CMC, the ra te constants become insensitive to the concentration in the studied ra nge of temperature, 25-degrees-C-40-degrees-C. The activation paramete rs for the kinetic process have been found to be reasonable, negative entropy of activation has supported a stable transition state complex. A good enthalpy-entropy compensation of the kinetic process has been found both for AOT and sodium monomethyl succinate in aqueous and aquo -dioxane media supporting similar nature of the transition state compl exes in the hydrolytic reactions. The enthalpies of hydrolysis of AOT and the half ester of succinic acid in aqueous and aquo-dioxane media have been also reported. (C) 1994 John Wiley & Sons, Inc.