Conclusions
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1.
It was shown that the actual empirical formula of saurine is C19H22O6·H2O.
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2.
Two possible structural formulas of saurine (Ia and Ib) are proposed. The formulas were confirmed by the NMR spectra and mass spectra.
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L. E. Kushnir and A. D. Kuzovkov, The Chemistry of Natural Compounds [in Russian], No. 4 (1966), p. 245.
A. Bellamy, Infrared Spectra of Complex Molecules [Russian translation], Moscow (1963), p. 269.
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The elemental analysis was run by E. A. Nikonova and E. A. Plokhova. M. E. Perel'son and A. A. Kir'yanov ran the IR spectra on a UR-10 instrument. The NMR spectra were run on a JNM-4H-100 instrument in the physicochemical methods of analysis laboratory (Prof. Yu. N. Sheinker director) of the S. Ordzhonikidze All-Union Research Pharmaceutical Chemistry Institute, The mass spectra were run on the MX-1303 instrument by V. M. Bochkarev. The authors thank K. K. Pivnitskii for his help in interpreting the NMR spectra.
Translated from Khimiko-Farmatsevticheskii Zhurnal, No. 12, pp. 21–29, December, 1968.
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Kushnir, L.E., Kuzovkov, A.D. Problem concerning structure of saurine, a sesquiterpenic lactone from Saussurea pulchella Fisch. Pharm Chem J 2, 671–677 (1968). https://doi.org/10.1007/BF00763331
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DOI: https://doi.org/10.1007/BF00763331