In contrast with a previous report, biphenyl-4-carboxylic acid is reduced by Na–NH3 to provide only the 1,4- and 1′,4′-dihydrobiphenyl-4-carboxylic acids, by using rapid quenching techniques.
P. W. Rabideau, S. J. Nyikos, D. L. Huser and E. G. Burkholder, J. Chem. Soc., Chem. Commun., 1980, 210 DOI: 10.1039/C39800000210
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