[Cl:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][C:10]([O:13][CH2:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[C:9]([C:19]#[N:20])[CH:8]=2)[N:5]=[CH:4][C:3]=1[C:21]([O:23]CC)=[O:22].[OH-].[Na+].O.C(O)(=O)C>C(O)C>[Cl:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][C:10]([O:13][CH2:14][C:15]([CH3:18])([CH3:16])[CH3:17])=[C:9]([C:19]#[N:20])[CH:8]=2)[N:5]=[CH:4][C:3]=1[C:21]([OH:23])=[O:22]To a solution (10 ml) of ethyl 5-chloro-1-(3-cyano-4-neopentyloxyphenyl)pyrazole-4-carboxylate (1.01 g) in ethanol was added 1 N aqueous sodium hydroxide solution (3.4 ml) with stirring, and the mixture was heated at 60° C. for 1 hour. After the completion of the reaction, the reaction mixture was poured into water and neutralized with acetic acid. The precipitated crystals were recrystallized from ethyl acetate to give 0.46 g of 5-chloro-1-(3-cyano-4-neopentyloxyphenyl)pyrazole-4-carboxylic acid, melting point 212° C.
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