N-mehtyleneamine, which is used as important key intemediate in organic synthesis, coude be generated from the reaction of Amine and 35% Formaline in presence of the inorganic drying agents. The reaction proceeded via equilibrium shift reaction between amine and N-methyleneamine. We could synthesize two kind of Chloroacetanilides herbicides in high yield via 3-step 1-pot reaction using N-metyleneamine as key intermidiate