The co-occurrence of isomeric xanthones in certain plant extracts suggests their derivation from a common hydroxylated benzophenone. In vitro oxidation of some of these benzophenones produces xanthone mixtures corresponding to oxidative coupling occurring para and ortho or para only to an activating hydroxy-group. The oxidations can also be carried out enzymically.
J. E. Atkinson and J. R. Lewis, J. Chem. Soc. C, 1969, 281 DOI: 10.1039/J39690000281
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