HCID 21820054, compound → HCID 20538577, compound

Participants

Reaction Steps

To an ice-cold solution of 3-hydrazino-4-aminocarbonyl-6-chloro-pyridazine (4.2 g; 0.0244 mole) [obtained as reported in J. Het. Chemistry, 7, 465 (1970)] in 15% acetic acid, a solution of sodium nitrite (1.55 g) in water (10 ml) was added dropwise. After stirring for one hour at 5°-10° C., the separated precipitate was filtered, crystallized from water, filtered again and dried under vacuum at 50° C. to give 3.44 g (77.5%) of the title compound, m.p. 226° C. (dec.).

Provenance & Evidence