[CH2:1]([C:6]1[CH:11]=[CH:10][C:9]([O:12][C:13](=[O:28])[C:14]2[CH:19]=[CH:18][C:17]([O:20]CC3C=CC=CC=3)=[CH:16][CH:15]=2)=[CH:8][CH:7]=1)[CH2:2][CH2:3][CH2:4][CH3:5].C1CCCCC=1>[OH-].[OH-].[Pd+2].C(O)C>[CH2:1]([C:6]1[CH:11]=[CH:10][C:9]([O:12][C:13](=[O:28])[C:14]2[CH:15]=[CH:16][C:17]([OH:20])=[CH:18][CH:19]=2)=[CH:8][CH:7]=1)[CH2:2][CH2:3][CH2:4][CH3:5]To 100 mL of dehydrated ethanol, 15.6 g (41.5 mmol) of 4-benzyloxy-benzoic acid 4-pentyl-phenyl ester, 25 mL of cyclohexene, and 0.78 g of palladium hydroxide/carbon were added. Then, the mixture was refluxed for 10 hours under argon. The resulting reaction mixture was filtered, and the filtered liquid was concentrated. The residue was recrystallized from toluene. As a result, 11.0 g of a white solid was obtained.
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