Ganesamoorthy Thirunarayanan, K.G. Sekar, Hammett Spectral Correlations in Benzofuranyl Flavonols, Volume 25, International Letters of Chemistry, Physics and Astronomy (Volume 25)
https://www.scipress.com/ILCPA.25.39
Abstract:
    A series containing eleven benzofuranyl flavonols have been prepared by cyclization of 3-hydroxybenzofuranyl chalcones with 30% hydrogen peroxide in the presence of sodium bicarbonate. The synthesized flavonols were characterized by their physical constants, analytical and spectroscopic data. The infrared spectral<i> ν</i>OH, CO stretches(cm<sup>-1</sup>), NMR chemical shifts of OH, CO(δ, ppm) of these flavonols were assigned and correlated with Hammett substituent constants, F and R parameters using single and multi linear regression analysis. From the results of statistical analyses, the effects of substituents on the above group frequencies were discussed.
Keywords:
    Benzofuranyl Flavonols, Hammett Equation, IR Spectra, NMR Spectra, Regression Analysis