Abstract
The signals in the13C NMR spectra of protonated 2-, 3-, 4-, 5-, 6-, and 8-S-methylquinolines in solution in 6 N DCl were assigned. The changes in the13C chemical shifts relative to the neutral molecules were compared with the results of calculations within the CNDO/2 approximation. It is shown that when the molecules are protonated, the shift of the13C signals is due to changes in the charges and the paramagnetic components of shielding of the nuclei.
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I. V. Zuika, Yu. Yu. Popelis, I. P. Sekatsis, Z. P. Bruvers, and M. A. Tsirule, Khim. Geterotsikl. Soedin., No. 12, p. 1665 (1979).
Yu. Yu. Popelis, I. V. Zuika, Z. P. Bruvers, and I. P. Sekatsis, Khim. Geterotsikl. Soedin., No. 5, 657 (1980).
Z. P. Bruvers and I. V. Zuika, Khim. Geterotsikl. Soedin., No. 3, 387 (1980).
A. Albert and G. B. Barlin, J. Chem. Soc., Nos. 7–8, 2384 (1959).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 663–665, May, 1980.
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Zuika, I.V., Bruvers, Z.P. & Tsirule, M.A. 13C NMR spectra of protonated S-methylquinolines. Chem Heterocycl Compd 16, 517–519 (1980). https://doi.org/10.1007/BF00561351
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DOI: https://doi.org/10.1007/BF00561351