5-Oxidovinylphenanthridiniums with 6-aryl substituents exhibit cis–trans and rotational isomerism. The nature of the species involved has been elucidated by variable temperature n.m.r. spectroscopy and by observation of the properties of related compounds.
R. M. Acheson and I. A. Selby, J. Chem. Soc. C, 1971, 691 DOI: 10.1039/J39710000691
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