Infrared, 1H and 13C NMR Spectral Studies of some 4-([1,1′-Biphenyl]-4-yl)-6-(Substituted Phenyl)-5,6-Dihydro-4H-1,3-Oxazine-2-Amines: Assessment of Substituent Effects
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 NH 2 , C=N, COC stretches, NMR spectral chemical shifts (δ, ppm) of NH...
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Veröffentlicht in: | International letters of chemistry, physics and astronomy physics and astronomy, 2015-05, Vol.50, p.9-16 |
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Hauptverfasser: | , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | 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 NH
2
, C=N, COC stretches, NMR spectral chemical shifts (δ, ppm) of NH
2
, H
4-6
, C=N, and C
4
-
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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ISSN: | 2299-3843 2299-3843 |
DOI: | 10.56431/p-9opx39 |