Results Uncatalyzed Reactions. The kinetics governing the aminolysis of 2-hydroxy-5-nitro-a- toluenesulfonic acid sultone (1) by n-butylamine (eq 2) have been determined in acetonitrile and toluene at 25 “C. A plot of kObsd/[BuNH2] vs.[BuNH2] for the reactions in acetonitrile yields a straight line (Figure 1). Thus, the