Abstract Reactions of 2-benzylidenemalononitrile and 2-nitro-3-phenylacrylonitrile with aryl azides in diethyl ether at room temperature gave mixtures of regioisomeric 1 (3)-aryl-5- phenyl-4, 5-dihydro-1 (3) H-1, 2, 3-triazole-4, 4-dicarbonitriles and 1-aryl-5 (4)-phenyl-1 H-1, 2, 3-triazole-5 (4)-carbonitriles, respectively. 2-Benzylidenemalononitrile reacted with the same arylazides on heating in boiling chloroform to produce 1-aryl-2-phenylaziridine-2, 2- ...