Abstract
Reactions with excess hydrazine hydrate of 5-nitropyridin-2(1H)-ones fused with benzene, pyridine, and 1,2,3-triazole rings led to a cyclotransformation of the 5-nitro-2-oxopyridine fragment into the 6-methyl-3-oxopyridazine structure. This cyclotransformation is of general character; a probable mechanism of the process is suggested. Details of the assumed mechanism were experimentally confirmed on model compounds.
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