[CH3:1][N:2]1[C:6](=[O:7])[CH:5]=[C:4]([CH3:8])[NH:3]1.[OH-].[Ca+2].[OH-].[Cl:12][C:13]1[CH:21]=[C:20]([Cl:22])[CH:19]=[CH:18][C:14]=1[C:15](Cl)=[O:16]>C(O)(C)C>[CH3:1][N:2]1[C:6]([OH:7])=[C:5]([C:15](=[O:16])[C:14]2[CH:18]=[CH:19][C:20]([Cl:22])=[CH:21][C:13]=2[Cl:12])[C:4]([CH3:8])=[N:3]1In 65 ml. of isopropanol are suspended 4.48 g. of 1,3-dimethyl-5-pyrazolone and 3 g. of calcium hydroxide and the resulting suspension is heated under reflux for 30 minutes with stirring. After cooling, 8.4 g. of 2,4-dichlorobenzoyl chloride is added dropwise thereto. After completion of the dropwise addition, the mixture is heated under reflux for 2 hours. The solvent is distilled off from the reaction mixture and 15 ml. of water is added to the residue. The mixture is made acidic with 23 ml. of a 2N hydrochloric acid solution and extracted with 60 ml. of chloroform. The chloroform layer is washed with water and the organic phase is separated and dried. The chloroform is distilled off. The residue is recrystallized from ethanol to give 7.6 g. of the desired product as colorless prisms of mp. 165°-166° C. Yield 66.7%
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