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N-(4H-1,2,4-Triazol-4-yl)acetamide (2) were prepared by reaction of 4-amino-4H-1,2,4-triazole (1) with acetyl chloride in dry benzene. It has been reacted with various aromatic aldehyde to afford 3-(substitutedphenyl)-N-(4H-1,2,4-triazol-4-yl)acrylamide (3a-e). The synthesis of N-(5-substitutedphenyl)-4,5-dihydro-1H-pyrazol-3-yl)-4H-1,2,4-triazol-4-amine (4a-e) is achieved by the cyclisation of 3a-e with hydrazine hydrate in ethanol. The structures of synthesized compounds were characterized by 1H NMR and IR spectroscopic studies. The purity of the compounds was checked by thin layer chromatography.

Synthesis ofN-(5-(Substitutedphenyl)-4,5-dihydro-1H-pyrazol-3-yl)-4H-1,2,4-triazol-4-amine from 4-Amino-4H-1,2,4-triazole