Abstract The propanal hydroamination was studied. It was found that the reaction in ethanol proceeded faster than in 2-propanol. By 1 H and 13 C NMR method the existence was proved of a tautomeric equilibrium in ethanol solution between 4-(propylideneamino) benzoic acid and its enamine form, 4-(prop-1-en-1-ylamino) benzoic acid.
