Low-temperature NMR Studies of the Conformations of 3-Aryl-1,2,3-oxathiazolidine 2-Oxides
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概要
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A complete iterative NMR spectral analysis has been carried out for twelve 3-aryl-1,2,3-oxathiazolidine 2-oxides at several low temperatures over a range of 111 °C. The magnitudes of the two vicinal coupling constants either increased or decreased markedly with a decrease in the temperature. On the basis of the resulting vicinal coupling constants, the correlations between the ratios of the vicinal coupling constants and the corresponding torsion angles were obtained and made it possible to assign their twist-envelope conformations. From the experimental data, the parameters of the Karplus equation could be given:<BR>Jvic=5.3-cos(135±θ)+4.3cos2(135±θ)<BR>+45°≥θ≥-45°
著者
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Nishiyama Tomihiro
Department Of Applied Chemistry
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Yamada Fukiko
Department of Applied Chemistry, Faculty of Engineering, Kansai University
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Samukawa Hiroshi
Department of Applied Chemistry, Faculty of Engineering, Kansai University
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