The reaction of copper(II) halides with o-aryloxybenzaldehydes to give xanthones is shown to be a general one. 2-(6-Methoxy-2-naphthyloxy)benzaldehyde undergoes concomitant nuclear bromination to give 4-bromo-3-methoxybenzo[a]xanthen-12-one.
J. I. Okogun, J. Chem. Soc., Perkin Trans. 1, 1976, 2241 DOI: 10.1039/P19760002241
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