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2 International Letters of Chemistry, Physics and Astronomy

2 2014

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Spectral correlations in some substituted styryl (E)-4-((2-oxopropyl) diazenyl) benzoic acids

Sathiyendiran V., Sekar K. G., Thirunarayanan G., Arulkumaran R., Sundararajan R., Kamalakkannan D., Suresh R., Manikanadan V., Vijayakumar R., Vanangamudi G.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 11, iss. 1

33-43

A series of titled compounds were prepared and analyzed their purities by literature method. The infrared and NMR spectral group frequencies of the compounds were assigned and correlated with Hammett substituent constants, F and R constants using single and multi linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral frequencies was discussed.

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.