Effects of salts and mixed CH 3CN–H 2O solvents on alkaline hydrolysis of phenyl benzoate in the presence of ionic micelles

Abstract

The rate of reaction of phenyl benzoate (PB) with −OH is slower in the micelles of sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTABr) than in the aqueous pseudo-phase. The binding constants ( K S) of PB with SDS micelles are almost independent of [NaOH] and [NaBr] at a constant [NaOH]. A non-linear decrease and increase in K S and cmc, respectively, with increase in the contents of CH 3CN in mixed aqueous solvents is obtained under the presence of SDS micelles. The K S values increase non-linearly with increase in [KBr] at a constant [ −OH] in the presence of CTABr micelles.