[CH2:1]([C:4]1[CH:9]=[CH:8][C:7]([C:10]2[CH:18]=[CH:17][C:13]([C:14](O)=[O:15])=[CH:12][CH:11]=2)=[CH:6][CH:5]=1)[CH2:2][CH3:3].S(Cl)([Cl:21])=O>C(Cl)Cl>[CH2:1]([C:4]1[CH:9]=[CH:8][C:7]([C:10]2[CH:18]=[CH:17][C:13]([C:14]([Cl:21])=[O:15])=[CH:12][CH:11]=2)=[CH:6][CH:5]=1)[CH2:2][CH3:3]A mixture of 2.0 g of 4-(4-propylphenyl]benzoic acid and 30 ml of thionyl chloride is stirred at reflux for 45 minutes. The reaction mixture is evaporated in vacuo to a residue which is evaporated from carbon tetrachloride (2×50 ml) to give a residue which is dissolved in methylene chloride.
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