Summary
Para oxidation in the side-phenyl nucleus has now been investigated using potassium persulphate and 3′-hydroxy-3:5:7:4′:5′-pentamethoxy flavone obtained conveniently from cannabiscitrin. The resulting quinol on methylation yields 3:5:7:3′:4′:5′:6′-heptamethoxy flavone and on demethylation 6′-hydroxy myricetin which is the first example of a flavone having four hydroxyl groups in the side-phenyl nucleus.
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Balakrishna, K.J., Rao, N.P. & Seshadri, T.R. Nuclear oxidation in flavones and related compounds. Proc. Indian Acad. Sci. (Math. Sci.) 33, 151 (1951). https://doi.org/10.1007/BF03172199
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DOI: https://doi.org/10.1007/BF03172199