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1 International Letters of Chemistry, Physics and Astronomy

1 2014

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Hammett spectral correlations in benzofuranyl flavonols

Thirunarayanan G., Sekar K. G.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 6

39--47

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 νOH, CO stretches(cm-1), 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.