Plots of observed rate of pseudo-first-order decay, kobs, versus concentration of tetrabutylammonium acetate for deprotonation of the radical cations of (open circles) N,N-dimethylaniline, 1c, and N,N,-dimethylaniline with (filled circles) a 4-methyl substituent, 1b, (filled squares) a 2-methyl substituent, 2, and (open squares) a 2-tert-butyl substituent, 3, in acetonitrile with 0.5 m water and 0.5 m tetramethylammonium perchlorate, at room temperature.