3-Hydrazino-4-methyl-6-piperidinopyridazine

Hydrazino-4-methyl-6-piperidinopyridazine Formic acid Sodium carbonate... 

A mixture of 20.0 g of 3-hydrazino-4-methyl-6-piperidinopyridazine in 100 ml of aqueous 99% formic acid was heated at the boiling temperature under reflux for 3 h and then evaporated to dryness. The residue, containing 8-methyl-6-piperidino-s-triazolo[4,3-b]pyridazine formate was taken up in excess aqueous sodium carbonate and extracted with chloroform. After evaporation of the chloroform solvent the 8-methyl-6-piperidino-s-triazolo[4,3-b]pyridazine was crystallized from ethyl acetate. Yield 4.4 g, melting point 118-120°C. 

---