Cl.[CH3:2][O:3][C:4]1[CH:9]=[CH:8][C:7]([NH:10][NH2:11])=[CH:6][CH:5]=1.[C:12]1([C:18](=O)[CH2:19][C:20](=O)[CH3:21])[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.C(=O)([O-])[O-].[K+].[K+]>C(O)C>[CH3:2][O:3][C:4]1[CH:9]=[CH:8][C:7]([N:10]2[C:18]([C:12]3[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=3)=[CH:19][C:20]([CH3:21])=[N:11]2)=[CH:6][CH:5]=1A mixture of 8.7 parts of (4-methoxyphenyl)hydrazine hydrochloride, 8.1 parts of 1-phenyl-1,3-butanedione, 7 parts of potassium carbonate and 160 parts of ethanol is stirred and refluxed for 20 hours. The reaction mixture is cooled and poured onto water. The product is extracted twice with 2,2'-oxybispropane. The combined extracts are washed with water, dried filtered and evaporated. The residue is crystallized twice from petroleumether. The product is filtered off and dried, yielding 7 parts (53%) of 1-(4-methoxyphenyl)-3-methyl-5-phenyl-1H-pyrazole; mp. 110° C.
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