[CH2:1]([C:15]([O:17][CH3:18])=[O:16])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]([O-])=[O:13].O=S(Cl)[Cl:21]>C(Cl)Cl>[CH3:18][O:17][C:15]([CH2:1][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]([Cl:21])=[O:13])=[O:16]To a cold solution of 4.8 gms monomethyl 1,11-undecanedicarboxylate in 10 ml CH2Cl2 was added 5 ml SOCl2 dropwise over 5 minutes; then it was stirred at room temperature for 18 hours. The solvent was removed in vacuo to give 4.8 gms of an oily residue which was used without further purification.
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