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Protonation and Solvation of Weak Organic Bases. I. Basicity of ω‐Chloroacetophenones The protonation equilibria of ω‐chloroacetophenone and some p‐substituted derivates have been studied in the acid system H2O/H2SO4/SO3 by u.v. and 1H‐n.m.r. spectroscopy. From the determined H0 values for half‐protonation pKBH+ values were calculated by means of the solvation parameters m of YATES and McCLELLAND. The (H0)1/2 and the pKBH+ values were successfully correlated with σp and σp+ substituent constants.