REACTIONS OF BETAINE ESTERS WITH HYDROXIDE ION IN REACTIVE AND UNREACTIVE COUNTERION SURFACTANT

Article abstract of DOI:10.1016/S0040-4020(01)89962-2

The reaction of hydroxide ion with methyl N-alkyl-N,N-dimethylglycinate (1) is catalysed by cationic micelles.The variation of the first-order constant, k_ψ, with the concentration of CTACl can be fitted to the pseudophase ion-exchange model, but this model fails when the counterion of the surfactant is OH(1-).The variations of k_ψ with counterion of CTAOH fit a kinetic model in which the distribution of the OH(1-) between the aqueous and micellar pseudophase depends upon .The value for the second-order rate constant in the micellar pseudophase predicted by both models is similar and it is smaller than the second-order rate constants in water.