Conclusions
The ionization constants of the 5-hydroxy groups in tectochrysin and chrysin have been determined spectrophotometrically, being 2.09×10−12 and 8.91×10−10, respectively. The 7-hydroxy group of chrysin has an ionization constant of 3.8 × 10−8.
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References
L. Jard, The Chemistry of Flavonoid Compounds, Bd, T. A. Geissmann, Pergamon Press., 107, 1962.
J. B. Harborne, Methods in Polyphenol Chemistry, London-New York, 13, 1964.
V. M. Peshkova and M. I. Gromova, Practical Handbook on Spectrophotometry and Colorimetry [in Russian], Moscow, 41, 1961.
A. Albert and E. Serjeant, Ionization Constants of Acids and Bases [Russian translation], Khimiya, Moscow-Leningrad, 68, 1964.
N. A. Tyukavkina, V. I. Lutskii, A. K. Dzizenko, and V. A. Pentegova, KhPS [Chemistry of Natural Compounds], 4, 249, 1968.
L. Fieser and M. Fieser, Organic Chemistry [Russian translation], Khimiya, Moscow, 271, 1966.
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Khimiya Prirodnykh Soedinenii, Vol. 6, No. 1, pp. 24–27, 1970
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Tyukavkina, N.A., Pogodaeva, N.N. & Lutskii, V.I. Ultraviolet absorption of flavonoids. Chem Nat Compd 6, 20–23 (1970). https://doi.org/10.1007/BF00564149
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DOI: https://doi.org/10.1007/BF00564149