(S)-2-methyl-1-butyl 4-benzyloxy-4'-biphenylcarboxylate → 4'-[(S)-2-methylbutoxycarbonyl]biphenyl-4-ol

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In a 125-ml Parr bomb equipped with a magnetic stirrer were placed 960 mg (S)-2-methyl-1-butyl 4-benzyloxy-4'-biphenylcarboxylate, 200 mg 5% palladium on carbon, and 50 ml ethyl acetate. The bomb was purged with argon and pressurized with 500 psi hydrogen. After stirring at room temperature for one day, thin layer chromatographic analysis showed that considerable starting material remained. An additional 200 mg 5% palladium on carbon was carefully added, and the bomb was re-pressurized with 500 psi hydrogen. After stirring for one more day, TLC analysis showed that the reaction was complete. The reaction mixture was filtered through Celite and the solids were washed thoroughly with ethyl acetate. Evaporation of the solvent yielded white crystals which were recrystallized from hexanes at low temperature to yield 0.62 g (85%) of product, mp 111.5°14 113° C., whose structure was confirmed by infrared, nuclear magnetic resonance, and mass spectral analyses, as follows. ##STR28##

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