C[N:2]1[CH:6]=[C:5]([C:7]2[CH:8]=[C:9]([C:13]([F:16])([F:15])[F:14])[CH:10]=[CH:11][CH:12]=2)[C:4](=[O:17])[N:3]1[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.Cl.[Cl:25]C1C=C(NN)C=CC=1.C(N(CC)CC)C>C1(C)C=CC=C(C)C=1>[Cl:25][C:20]1[CH:19]=[C:18]([N:3]2[C:4](=[O:17])[C:5]([C:7]3[CH:8]=[C:9]([C:13]([F:16])([F:15])[F:14])[CH:10]=[CH:11][CH:12]=3)=[CH:6][NH:2]2)[CH:23]=[CH:22][CH:21]=1A 3.5 gram portion of the atropic ester of Example 1 was reacted with 2.3 grams 3-chlorophenylhydrazine hydrochloride in the presence of 1.3 grams triethylamine in about 50 ml. meta-xylene. The mixture was then stirred at reflux overnight, and the reaction mixture evaporated to dryness under vacuum. The residue was partitioned between ethyl acetate and water, and the organic layer was dried over sodium sulfate and evaporated to dryness. The residue was chromatographed on silica gel with ethyl acetate as the eluant. The product containing fractions were combined and evaporated to dryness to produce a crude product, which was recrystallized from methanol to produce 2 grams 1-(3-chlorophenyl)-4-(α,α,α-trifluoro-3-tolyl)-3-pyrazolin-5-one, m.p. 182°-184° C.
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