SCHEDULED MAINTENANCE
The synthesis of orcinoylhydroquinones has been achieved by photochemical Fries rearrangement of their esters. A study of their oxidation (DDQ) shows that oxidative coupling occurs to produce a spirocyclohexenedione which can be thermally isomerised to the xanthone. The synthesis of a tetracyclic xanthone (related to bikaverin) is described.
J. R. Lewis and J. G. Paul, J. Chem. Soc., Perkin Trans. 1, 1981, 770 DOI: 10.1039/P19810000770
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