Cl[C:2]1[N:3]=[N:4][C:5]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=2[F:14])=[CH:6][CH:7]=1.[CH:15]([NH:17][NH2:18])=O>C(O)CCC>[F:14][C:9]1[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=1[C:5]1[CH:6]=[CH:7][C:2]2[N:3]([CH:15]=[N:17][N:18]=2)[N:4]=1A mixture of 5.0 g. of 3-chloro-6-(o-fluorophenyl)pyridazine and 2.88 g. of formylhydrazine in 75 ml. n-butanol is refluxed for 48 hrs. and worked up as in Example 35 to give 1.1 g. of product as cream colored crystals, m.p. 161°-163° C.
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