[F:1][C:2]1[CH:14]=[CH:13][C:5]([O:6][CH:7]([CH2:11][CH3:12])[C:8](O)=[O:9])=[CH:4][C:3]=1[C:15]([F:18])([F:17])[F:16].S(Cl)([Cl:21])=O>C(Cl)Cl.N1C=CC=CC=1>[F:1][C:2]1[CH:14]=[CH:13][C:5]([O:6][CH:7]([CH2:11][CH3:12])[C:8]([Cl:21])=[O:9])=[CH:4][C:3]=1[C:15]([F:18])([F:17])[F:16]To 1.2 g (4.5 mmole) of (-)-2-(4-fluoro-3-trifluoromethylphenoxy)butanoic acid dissolved in 15 ml methylene chloride was added one drop of pyridine and further added dropwise 0.6 g of thionyl chloride. The reaction mixture was further stirred at room temperature for 4 hours and then thionyl chloride and methylene chloride were removed under reduced pressure to obtain 1.2 g of (-)-2-(4-fluoro3-trifluoromethylphenoxy)butanoic acid chloride. The resulting mixture was applied for the next reaction without purification.
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