Hydrazides of Acetylenylpyrazolecarboxylic Acids

The cyclization of hydrazides of aromatic and heteroaromatic acids is likely to give four most probable products diazepines, diazines, 5-iV-aminolactams, and y -iV-aminolactams. 

The data thus obtained allow us to make some generalizations for the heterocy-clization of hydrazides of the vicinal acetylenic derivatives of pyrazolecarboxylic 

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