[C:1]1([C:7]2[CH:15]=[CH:14][C:10]([C:11]([OH:13])=[O:12])=[C:9]([CH3:16])[CH:8]=2)[CH2:6][CH2:5][CH2:4][CH2:3][CH:2]=1.[H][H]>C(O)C.C(OCC)(=O)C.[C].[Pd]>[CH:1]1([C:7]2[CH:15]=[CH:14][C:10]([C:11]([OH:13])=[O:12])=[C:9]([CH3:16])[CH:8]=2)[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6]1To a solution of 4-cyclohexenyl-2-methylbenzoic acid (2.61 g) in ethanol (30 ml) and ethyl acetate (30 ml) is added 5% palladium-carbon (0.4 g), and the mixture is stirred at room temperature under atmospheric pressure of hydrogen gas for 30 minutes. The palladium-carbon is removed by filtration through celite, and the filtrate is evaporated to remove the solvent. The precipitated crystals are collected by filtration, crystallized from acetone/n-hexane, and washed to give 4-cyclohexyl-2-methylbenzoic acid (2.27 g) as white powder.
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