Chemical and n.m.r. spectroscopic evidence indicates that the higher and lower melting forms of 2-benzyl-3-phenylsuccinic acid (1) are the erythro and threo diastereoisomers, respectively. The n.m.r. spectra of the dimethyl esters reflect the conformational preferences of these derivatives in solution.
A. E. Opara and G. Read, J. Chem. Soc., Perkin Trans. 1, 1973, 1221 DOI: 10.1039/P19730001221
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