Quercetin and 3-hydroxyflavone are oxidized to the corresponding 2-alkoxyflavan-3,4-diones by CuCl2 catalysis in MeOH or EtOH under oxygen or nitrogen, the mechanism of which is proposed.
M. Utaka and A. Takeda, J. Chem. Soc., Chem. Commun., 1985, 1824 DOI: 10.1039/C39850001824
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