N 2-Aryl-N 1-alkylformamidines are conveniently and rapidly prepared by the reaction of an aromatic amine with ethyl N-cyanoformimidate to give the N 2-aryl-N 1-cyanoformamidine. Addition of this intermediate to an excess of an alkyl- or dialkylamine results in the formation of the title compounds in high yield and satisfactory purity. A mechanism for this reaction is proposed and discussed.
N 2-芳基-N 1-烷基甲脒是通过芳香胺与 N-氰基甲酰胺亚胺乙酯反应生成 N 2-芳基-N 1-氰基甲脒而方便快速地制备的。将这种中间体加入过量的烷基胺或二烷基胺中,就能以高产率和令人满意的纯度生成标题化合物。本文提出并讨论了这一反应的机理。