| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing (R,S)-N-benzyl-2-(4-fluoro-3- trifluoromethylphenoxy)butanamide by which operating efficiency is excellent with high yield and a crystallizing solvent to be used is reduced in crystallization of the (R,S)-N-benzyl-2-(4-fluoro-3-trifluoromethylphenoxy) butanamide. SOLUTION: A concentration residue of a reactional liquid for synthesizing the (R,S)-N-benzyl-2-(4-fluoro-3-trifluoromethylphenoxy)butanamide is mixed with an aprotic solvent and a protic solvent in a specific proportion to the aprotic solvent to thereby crystallize the (R,S)-N-benzyl-2-(4-fluoro-3- trifluoromethylphenoxy)butanamide. In the crystallization, the yield is high and operating efficiency is excellent. Furthermore, the crystallizing solvent to be used can be reduced.
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