[CH2:1]([O:3][C:4](=[O:16])/[CH:5]=[CH:6]/[C:7]1[CH:8]=[C:9]([CH:13]=[CH:14][CH:15]=1)[C:10]([OH:12])=[O:11])[CH3:2]>C(O)C.[Pd]>[CH2:1]([O:3][C:4](=[O:16])[CH2:5][CH2:6][C:7]1[CH:8]=[C:9]([CH:13]=[CH:14][CH:15]=1)[C:10]([OH:12])=[O:11])[CH3:2]To a solution of (E)-3-(3-ethoxy-3-oxoprop-1-en-1-yl)benzoic acid (8.60 g) in ethanol (500 mL) was added 10% palladium-activated carbon (4.10 g) and, under a hydrogen atmosphere, the mixture was stirred at room temperature for 3 hr. The reaction mixture was filtered, and the filtrate was concentrated under reduced pressure to give the title compound (8.70 g) as a white amorphous solid.
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