[Br:1][C:2]1[CH:14]=[CH:13][C:5]([O:6][CH2:7][CH2:8][CH2:9][C:10](O)=[O:11])=[CH:4][CH:3]=1.O=S(Cl)[Cl:17]>>[Br:1][C:2]1[CH:14]=[CH:13][C:5]([O:6][CH2:7][CH2:8][CH2:9][C:10]([Cl:17])=[O:11])=[CH:4][CH:3]=14-(4-Bromophenoxy)butanoic acid (39 g, 25.6 mmol) was dissolved in SOCl2 (100 ml) mixture was heated to refluxed overnight. the mixture was concentrated in vacuo to give 4-(4-bromophenoxy)butanoyl chloride (27.6 g, 67%).
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