The n.m.r. spectra of suitable 6-aryl- and 6-aralkylphenanthridinium 5-vinyloxides have shown that restricted rotation of the 5- and 6-substituents gives rise to pairs of diastereomeric rotamers and in one case both rotamers were isolated and characterised.
R. M. Acheson and I. A. Selby, J. Chem. Soc. D, 1970, 62 DOI: 10.1039/C29700000062
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