Conclusions
It has been shown that the dehydration of the sesquiterpene lactone coronopilin with SOCl2 forms Δ1(2)-anhydrocoronopilin. The configuration of the methyl groups at C5 and C10 in anhydrocoronopilin has been established by analogy with the conversion products of the pseudoguaianolide parthenin.
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References
V. I. Novikov, Yu. N. Forostyan, and D. P. Popa, KhPS [Chemistry of Natural Compounds], 5, no. 6, 1969.
W. Herz, H. Watanabe, M. Miyazaki, and Y. Kishida, J. Am. Chem. Soc., 13, 2601, 1962.
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Khimiya Prirodnykh Soedinenii, Vol. 6, No. 1, pp. 29–31, 1970.
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Novikov, V.I., Forostyan, F.N. & Popa, D.P. A sesquiterpene lactone ofCyclachaena xanthifolia-anhydrocoronopilin. Chem Nat Compd 6, 26–27 (1970). https://doi.org/10.1007/BF00564151
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DOI: https://doi.org/10.1007/BF00564151