[CH2:1]([C:5]1[CH:10]=[CH:9][C:8]([CH:11]([CH3:22])[C:12]([O:14]CC2C=CC=CC=2)=[O:13])=[CH:7][CH:6]=1)[CH:2]([CH3:4])[CH3:3].[Cl-].[Al+3].[Cl-].[Cl-]>C(Cl)Cl.[N+](C)([O-])=O.C1(OC)C=CC=CC=1.C(OCC)(=O)C>[CH2:1]([C:5]1[CH:6]=[CH:7][C:8]([CH:11]([CH3:22])[C:12]([OH:14])=[O:13])=[CH:9][CH:10]=1)[CH:2]([CH3:4])[CH3:3]
To a solution of benzyl 2-p-isobutylphenylpropionate (3 g) in methylene chloride (18 ml) are added a solution of aluminum chloride (4 g) in nitromethane (50 ml) and anisole (3 ml) at 0° C., and the mixture is stirred at room temperature for 6 hours. The reaction mixture is diluted with ethyl acetate, washed with hydrochloric acid and water, dried and evaporated. The residue is recrystallized with n-hexane to give 2-p-isobutylphenylpropionic acid (186 mg) melting at 75°-77.5° C. Yield 91%.
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