Formamide → 1-(2-Bromophenyl)-1H-1,2,4-triazole

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A suspension of 2-bromophenylhydrazine hydrochloride (5.0 g, 22 mmol) in formamide (10 ml) was heated at 140° C. for 16 h. The reaction mixture was cooled to ambient temperature, diluted into dichloromethane (50 ml) and washed with water (3×20 ml). The organic phase was dried over anhydrous magnesium sulfate, filtered and evaporated to dryness. Purification by chromatography on silica gel eluting with dichloromethane gave 1-(2-bromophenyl)-1H-[1,2,4]triazole (4.80 g) as a tan solid: δH (400 MHz, CDCl3) 8.49 (1H, s), 8.14 (1H, s), 7.76 (1H, dd, J 1 and 8), 7.44-7.53 (2H, m), 7.34-7.39 (1H, m).

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