| 摘要 |
PROBLEM TO BE SOLVED: To provide a purification process for 1-(4-chloro-benzoyl)-5-methoxy-2- methyl-3-acetaic acid with industrial advantage. SOLUTION: Crude 1-(4-chloro-benzoyl)-5-methoxy-2-methyl-3-acetic acid is recrystallized from a mixed solvent of an aliphatic ketone, for example, acetone or methyl ethyl ketone and an aliphatic hydrocarbon solvent, for example, n-pentane or n-hexane.
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