Abstract
About ten titled compounds were prepared by microwave assisted silica-phosphoric acid catalysed cyclization of substituted styryl 4-biphenyl ketones and urea under solvent-free conditions. The infrared frequencies (ν, cm-1) of NH2, C=N, COC stretches, NMR spectral chemical shifts (δ, ppm) of NH2, H4-6, C=N, and C4-6 were assigned and correlated with Hammett substituent constants, F and R parameters using single and multi-regression analysis. From the results of statistical analysis, the effect of substituents on the infrared frequencies (ν, cm-1) and NMR chemical shifts (δ, ppm) has been studied.
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