[CH3:1][CH:2]([CH2:9][CH2:10][CH2:11][CH:12]([CH3:24])[CH2:13][CH2:14][CH2:15][CH:16]([CH3:23])[CH2:17][CH2:18][CH2:19][CH:20]([CH3:22])[CH3:21])[CH2:3][CH2:4][CH2:5][C:6](O)=[O:7].S(Cl)([Cl:27])=O>N1C=CC=CC=1.C(Cl)Cl>[CH3:1][CH:2]([CH2:9][CH2:10][CH2:11][CH:12]([CH3:24])[CH2:13][CH2:14][CH2:15][CH:16]([CH3:23])[CH2:17][CH2:18][CH2:19][CH:20]([CH3:22])[CH3:21])[CH2:3][CH2:4][CH2:5][C:6]([Cl:27])=[O:7]Under a nitrogen atmosphere, one drop of pyridine was added to 10 g of 5,9,13,17-tetramethyloctadecanoic acid and 20 ml of methylene chloride, and 5.2 g of thionyl chloride was added dropwise thereto at room temperature. After the completion of dropwise addition, the mixture was refluxed for 1 hour and concentrated under reduced pressure to obtain 10.5 g of 5,9,13,17-tetramethyloctadecanoic acid chloride.
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