Addition of diazoacetonitrile to para-substituted N-benzilidene-anilines has been studied. The addition is easier if the substituent is an electrodonating group. Products obtained are Δ2-1, 2, 3-triazolines or aziridnes, and enamines resulting from the decomposition of the triazolines with migration of the 5-aryl substituent. Decomposition of the triazolines under various conditions has also been studied.