CN(C)C=O.[CH3:6][C:7]1[C:11]([C:12]([OH:14])=[O:13])=[CH:10][N:9]([C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[N:8]=1.CS(O[CH2:26][CH2:27][C:28]([CH3:32])=[C:29]([F:31])[F:30])(=O)=O.C(=O)([O-])O.[Na+]>O>[CH3:6][C:7]1[C:11]([C:12]([O:14][CH2:26][CH2:27][C:28]([CH3:32])=[C:29]([F:31])[F:30])=[O:13])=[CH:10][N:9]([C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[N:8]=1To 5 ml of N,N-dimethylformamide were dissolved 0.57 g (2.8 mmol) of 3-methyl-1-phenyl-1H-pyrazole-4-carboxylic acid, obtained in accordance with a method described in J. Chem. Soc., page 2736 (1961), and 0.58 g (2.9 mmol) of 4,4-difluoro-3-methyl-3-butenyl methanesulfonate, followed by the addition of 0.48 g (5.7 mmol) of sodium hydrogencarbonate and stirring at 100° C. for 3 hours. The reaction liquid was then poured in water and extracted with diethyl ether. The organic layer was washed with water and a saturated saline solution in this order, followed by drying over anhydrous magnesium sulfate and concentration under reduced pressure. The residue was purified with silica gel column chromatography (ethyl acetate:hexane=1:6) to obtain 0.66 g (yield: 76%) of 4,4-difluoro-3-methyl-3-butenyl 3-methyl-1-phenyl-1H-pyrazole-4-carboxylate.
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