Abstract Reactions of 5-nitropyridin-2 (1 H)-one and its N-methyl derivative with hydrazine hydrate led to the formation of (1 H-pyrazol-3-yl) acetohydrazide. Under analogous conditions, 1, 3-dimethyl-5-nitropyridin2 (1 H)-one gave rise to 2-(1 H-pyrazol-3-yl) propionohydrazide, while 6-methyl-5-nitropyridin-2 (1 H)-one was converted into (5-methyl-1 H-pyrazol-3-yl) acetohydrazide. Hydrazinolysis of 4-methyl-5-nitropyridin-2 (1 H)-one ...
