Kuraishi, Tsukasa published the artcile< Synthesis of 4-aminopyridazine>, Name: Pyridazin-4-amine, the main research area is PYRIDINES/preparation of.
3,4,6-Trichloropyridazine (20 g.) heated 5 hrs. in a sealed tube in an oil bath at 100-5° with absolute EtOH saturated with NH3 and the solvent removed in vacuo yielded 7 g. 4-amino-3,6-dichloropyridazine (I), m. 203° (from H2O). This (2 g.) in 30 cc. MeOH containing 1 g. NaOH catalytically hydrogenated (Pd-C), the solvent distilled, and the residue extracted with AcOEt yielded 1 g. 4-aminopyridazine (II), m. 129-31. Absorption maximum in EtOH were: II, 252 and 281 mμ (ε 11,350 and 3,690); 3-aminopyridazine (Steck, et al., C.A. 49, 8987h), 234 and 301-2 mμ (ε 9.200 and 2,400); and I, 256 and 294-5 mμ (ε 9,800 and 4,500).
Pharmaceutical Bulletin published new progress about UV and visible spectra. 20744-39-2 belongs to class pyridazine, and the molecular formula is C4H5N3, Name: Pyridazin-4-amine.
Referemce:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem