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Abstract 2-Hydroxy-4-methoxy- and 2-hydroxy-4,4′-dimethoxybenzophenones were oxidized to dimeric compounds with lead tetraacetate and with manganic acetate. 2-Hydroxy-2′,4,4′-trimethoxy- and 2-hydroxy-3′,4,4′trimethoxybenzophenones were oxidized to substituted xanthones. The structures of the products were determined by NMR and mass spectra, and were confirmed by syntheses.
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Kurosawa et al. (1973) studied this question.
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