Hydrochloric Acid → HCID 178481777, compound

Reaction equation

[NH2:1][C:2]1[C:3](=[O:10])[N:4]([CH3:9])[N:5]=[CH:6][C:7]=1[NH2:8].Cl.[N:12]([O-])=O.[Na+]>O>[CH3:9][N:4]1[C:3](=[O:10])[C:2]2[N:1]=[N:12][NH:8][C:7]=2[CH:6]=[N:5]1

Participants

Procedure

In water (10 ml) was dissolved 4,5-diamino-2-methyl-3(2H)-pyridazinone (280 mg) followed by addition of concentrated hydrochloric acid (0.5 ml) with ice-cooling. Then, sodium nitrite (290 mg)/water (5 ml) was added dropwise at a temperature not exceeding 10° C. and the mixture was stirred at that temperature for 1 hour and then at 100° C. for 1 hour. This reaction mixture was allowed to stand in the refrigerator for 16 hours and the resulting precipitate was collected by filtration, rinsed with water, and dried. White powder, 262 mg. 1H-NMR (DMSO-d6) δ: 3.76(3H,s), 8.71(1H,s).