[Cl:1][C:2]1[CH:3]=[C:4]([C:8]([CH3:13])([CH3:12])[C:9](O)=[O:10])[CH:5]=[CH:6][CH:7]=1.S(Cl)([Cl:16])=O>>[Cl:1][C:2]1[CH:3]=[C:4]([C:8]([CH3:13])([CH3:12])[C:9]([Cl:16])=[O:10])[CH:5]=[CH:6][CH:7]=12-(3-Chlorophenyl)-2-methylpropanoic acid (5.7 g, 28.7 mmol) was stirred in thionyl chloride (100 mL) for 2 hours at reflux. The thionyl chloride was removed under vacuum to give the product (5.69 g).
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