Axially chiral 1,1′-binaphthyl-2,2′-dicarboxylic acid was conveniently resolved through its brucine salts in satisfactory yields. The resolved diacids were confirmed to be optically pure from high-performance liquid chromatographic analyses of the dimethyl esters derived from them on an optically active poly(diphenyl-2-pyridylmethyl methacrylate) column.
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Kanoh et al. (1988) studied this question.
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