The temperature-dependent 1H n.m.r. spectra of suitably substituted disalicylides [(3) and (4)], related lactones [(8) and (9)], and bislactams [(10) and (11)], demonstrate their ring inversion (B ⇌ B*) between enantiomeric boat conformations.
W. D. Ollis and J. F. Stoddart, J. Chem. Soc., Chem. Commun., 1973, 571 DOI: 10.1039/C39730000571
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