Studies on the Pyridazine Derivatives. XVII. Structural Studies on the Product of 3-Hydrazino-4-aminopyridazine with Formic Acid (A Novel Ring Isomerization)

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The reaction product of 3-hydrazino-4-amino-6-chloropyridazine (IX) with formic acid was established to 6-chloro-8-amino-s-triazolo [4, 5-b] pyridazine (XII) by synthetic method and nuclear magnetic resonance spectral studies. 3-Benzylideneamino-6-chloroimidazo [4, 5-c] pyridazine (XI) was hydrolyzed to give 3-benzylidenehydrazino-4-amino-6-chloropyridazine (X), benzaldehyde and XII which was confirmed as a ring isomerization product of XI.