N-Oxides of polychloropyridines.13C NMR study |
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Authors: | N N Sveshnikov A M Sipyagin V M Anisimov |
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Institution: | (1) Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation |
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Abstract: | The effect ofN-oxidation of a series of polychloropyridines on13C NMR parameters has been studied. It has been established that inN-oxides of polychloropyridines an electric field through-space effect of theN-oxide group predominates in the shielding of the -carbon atom compared to the other carbon atoms. A linear correlation between13C NMR chemical shifts and total charge densities calculated by the MNDO method for the carbon atoms ofN-oxides of polychloropyridines has been found.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2425–2428, December, 1995.The authors are grateful to V. V. Kolchanov for help in the synthesis of compounds under study. |
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Keywords: | 13C NMR 13C-1H NMR coupling constants MNDO method N-oxides of polychloropyridines |
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