Both enantiomers of 1,1′-binaphthyl-2,2′-dicarboxylic acid (100% ee’s by HPLC) were conveniently obtained in high yields (ca. 80% of the theory) via fractional crystallization of the (S)-1-phenylethylamide diastereomers of the racemic acid followed by treatment with thionyl chloride and then alkaline hydrolysis.
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Ôi et al. (1989) studied this question.
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