S(=O)(=O)(O)O.Br.[C:7]1(=[O:23])[O:22][CH2:21][CH2:20][CH2:19][CH2:18][CH2:17][CH2:16][CH2:15][CH2:14][CH2:13][CH2:12][CH2:11][CH2:10][CH2:9][CH2:8]1.[Br:24]CCCCCCCCCCCCCCCOCCCCCCCCCCCCCCC(O)=O>C(O)(=O)C>[Br:24][CH2:21][CH2:20][CH2:19][CH2:18][CH2:17][CH2:16][CH2:15][CH2:14][CH2:13][CH2:12][CH2:11][CH2:10][CH2:9][CH2:8][C:7]([OH:22])=[O:23]The present reaction can be carried out in the presence of acetic acid and can be performed by using acetic acid as a solvent. As described in the above Non-patent Document 11, when concentrated sulfuric acid-hydrogen bromide acid is used and 15-pentadecanolide is reacted, for example, 15-(15-bromopentadecyloxy)pentadecanoic acid, which is difficult to get separated from the target compound 15-bromopentadecanoic acid, is produced as a byproduct. As a result, it becomes difficult to obtain highly pure 15-bromopentadecanoic acid.
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