Pyridine-2-carboxylic acid hydrazide

2524-52-9

1452-63-7

General procedure for the synthesis of 2-pyridinecarbohydrazide from ethyl 2-pyridinecarboxylate: a mixed solution of ethyl pyridine-2-carboxylate (90 g) and hydrazine hydrate (60 g) in ethanol (400 ml) was reacted with stirring at 80°C for 4 hours. After completion of the reaction, the solvent was removed by evaporation to give the crude product. The crude product was co-stirred with ether and the resulting suspension was filtered and the wet filter cake was washed with a small amount of ethanol (50 mL) to give 76 g (93% yield) of 2-pyridinecarbohydrazide as a white solid. Mass spectral data: m/z 138.0 (M+H).