The oxidation of certain hydroxy-methoxybenzophenones with dichlorodicyanobenzoquinone (DDQ) to give xanthones can best be interpreted via phenoxonium-ion intermediates.
J. W. A. Findlay, P. Gupta and J. R. Lewis, J. Chem. Soc. C, 1969, 2761 DOI: 10.1039/J39690002761
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