反应详情

3,4-Dichloro-5-(4-chlorophenyl)-pyridazine (6.0 g, 23.1 mmol) was suspended in isobutanol (150 mL) at 0° C. and hydrazine monohydrate (11.1 g) was added dropwise over 10 min. The reaction mixture was slowly warmed up to RT and stirred for 24 h. The mixture was cooled in an ice/water bath for 15 min and filtered. The white solid thus obtained was washed with cold isopropanol and dried to give the title compound, 1-[4-chloro-5-(4-chloro-phenyl)-pyridazin-3-yl]-hydrazine, (5.0 g) as a white solid. HPLC: 1.65 min.

1. temperatureThe mixture was cooled in an ice/water bath for 15 min
2. filtrationfiltered
3. customThe white solid thus obtained
4. washwas washed with cold isopropanol
5. customdried