Kinetics of alkaline hydrolysis of esters of phosphorus acids in micellar and hexagonal phases in the cetyldimethylethylammonium bromide - NaOH - Water system

Article abstract of DOI:10.1007/BF02495592

The influence of micellar (Mi) and hexagonal (E) mesophases of the cetyldimethylethylammonium bromide-NaOH-water system (I) on the rates of alkaline hydrolysis of O-p-nitrophenyl-O,O-diethyl phosphate (2), O-p-nitrophenyl-O-ethylethyl phosphonate (3), and O,O-di(p-nitrophenyl)methyl phosphonate (4) was studied by UV spectrophotometry. The binding constants of the substrates, critical micelle concentrations, and rate constants of reactions in the micellar phase were determined. In micellar solutions of system I, a tenfold increase in the rates of alkaline hydrolysis of 2-4 was observed. An increase in the degree of medium ordering during the formation of the E-phase results in a twofold acceleration of alkaline hydrolysis of 2 and 3 and in the inhibition of this process in the case of 4.