5-Chloro-2-(3-trifluoromethyl-phenyl)-2H-pyridazin-3-one 、
丙酮腙 、
甲基肼 以there is obtained 2-(3-trifluoromethylphenyl)-5-(2-isopropylidenehydrazino)-pyridazin-3(2H)-one, (m.p. 255° to 257° C)的产率得到5-isopropylidenehydrazino-2-(3-trifluoromethyl-phenyl)-2
H-pyridazin-3-one