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    • Keywords


      Flavonol; Nobiletin; Dimethyl Sulphate; Tangeretin; Potassium Persulphate

    • Abstract


      It is shown that 5:6:7:8-hydroxy-flavonols (Calycopterein series) can be made from 5:6:7-hydroxy-flavonols (quercetagetin series) by the nuclear oxidation of the 8-position. Quercetagetin and nor-tangeretin have thus been converted into 6:8-dihydroxy-quercetin and calycopteretin in good yields.

    • Author Affiliations


      S Rajagopalan1 K Visweswara Rao1 T R Seshadri1

      1. Department of Chemistry, Andhra University, Waltair
    • Dates


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