The existence of enantiomeric rotational isomers in solutions of certain 5-oxidovinylphenanthridiniums and other sterically hindered molecules has been demonstrated by 1H n.m.r. spectroscopy using tris-[3-(trifluoromethylhydroxymethylene)-(+)-camphorato]europium(III).
R. M. Acheson and I. A. Selby, J. Chem. Soc., Chem. Commun., 1973, 537 DOI: 10.1039/C39730000537
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