The rate of racemisation of optically active 4,4′-biquinolyl varies only slightly from one solvent to another but drops about tenfold in strong acid. The effect is attributed mainly to alteration of the molecular dimensions on protonation.
M. Crawford and R. B. Ingle, J. Chem. Soc. B, 1971, 1907 DOI: 10.1039/J29710001907
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