Vanadium trifluoride oxide was found to convert a variety of 1,2-diarylethylene derivatives into phenanthrenes in high yield and provided the means for an efficient synthesis of (±)-tylophorine.
A. J. Liepa and R. E. Summons, J. Chem. Soc., Chem. Commun., 1977, 826 DOI: 10.1039/C39770000826
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