Second-order rate constants (k N) have been measured spectrophotometrically for the reaction of 4-nitrophenyl X-substituted benzoates with a series of alicyclic secondary amines in H2O containing 20 mol% dimethyl sulfoxide at 25.0° C. The magnitude of the k N values increases with increasing the basicity of amines and with increasing the electron- withdrawing ability of the acyl substituent X. The Hammett plots obtained are not linear but ...
