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N-Oxides of polychloropyridines.13C NMR study

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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 γ-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.

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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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Sveshnikov, N.N., Sipyagin, A.M. & Anisimov, V.M. N-Oxides of polychloropyridines.13C NMR study. Russ Chem Bull 44, 2319–2322 (1995). https://doi.org/10.1007/BF00713601

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Key words

  • 13C NMR
  • 13C-1H NMR coupling constants
  • MNDO method
  • N-oxides of polychloropyridines