The reactions of ethoxycarbonylhydrazone esters (1) with 4-amino-4,5-d
ihydro-1H-1,2,4-triazol-5-ones (2), 4-amino-4H-1,2,4-triazoles (3) and
3-amino-1,2,4-triazole (4) were studied, and the corresponding bihete
roaryls of the type (5) (6) and (7) were synthesized. IR, H-1-NMR and
UV spectral data of new compounds were presented and discussed.