Xanthones are side products of the reaction between salicylaldehyde–copper complexes and aryl halides; they are formed directly from o-phenoxybenzaldehydes with copper(II) halides.
J. I. Okogun and K. S. Okwute, J. Chem. Soc., Chem. Commun., 1975, 8 DOI: 10.1039/C39750000008
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