[CH:1]1([O:6][C:7]2[CH:8]=[C:9]([CH:13]=[CH:14][C:15]=2[S:16][CH3:17])[C:10](O)=[O:11])[CH2:5][CH2:4][CH2:3][CH2:2]1.S(Cl)([Cl:20])=O>C1(C)C=CC=CC=1>[CH:1]1([O:6][C:7]2[CH:8]=[C:9]([CH:13]=[CH:14][C:15]=2[S:16][CH3:17])[C:10]([Cl:20])=[O:11])[CH2:5][CH2:4][CH2:3][CH2:2]13-Cyclopentyloxy-4-(methylthio)benzoic acid (0.7 g) is dissolved in toluene (20 mL) and heated at 80° C. for 1 hour 30 minutes in the presence of thionyl chloride (5 mL). The reaction mixture is concentrated to give 3-cyclopentyloxy-4-(methylthio)benzoyl chloride (0.76 g), in the form of a yellow oil.
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