Effects of reactive and non-reactive counterion surfactants upon acid hydrolysis of hydroxamic acids

Rates of acidic hydrolysis of hydroxamic acids of the type RCON(OH)R' (R = CH3, R' = H, acetohydroxamic acid; R = C6H5, R' = H, benzohydroxamic acid; R = C6H5, R' = C6H5, N-phenylbenzohydroxamic acid) were determined in perfl uorooctanoic acid as a reactive counterion surfactant and also with sodium 1-dodecanesulphonate and sodium dodecyl sulphate. The pseudo-first-order ra te constants increase with reactive and non-reactive surfactant concentrati ons. These kinetic results were explained by means of the pseudo-phase ion- exchange kinetic model. Activation parameters were also determined. Copyrig ht (C) 1999 John Wiley & Sons, Ltd.