Ein neues germacran-8.12-olid und neue diterpene aus Polymnia canadensis |
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| Authors: | Ferdinand Bohlmann Christa Zdero Robert M King Harold Robinson |
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| Institution: | 1. Institut für Organische Chemie der Technischen Universität Berlin, Straße des 17. Juni 135, D-1000 Berlin 12, W. Germany;2. Smithsonian Institution, Washington, DC 20560, U.S.A. |
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| Abstract: | The aerial parts of P. canadensis afforded a new germacran-8,12-olide and several diterpenic acids. The stereochemistry of the lactone could be established only by careful 1H NMR investigations of the corresponding pyrazolines formed by addition of diazomethane, while the natural compound and its acetate only show very uncharacteristic NMR spectra. The diterpenes all belong to the rare isokaurene type. The chemotaxonomic aspects are discussed briefly. |
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| Keywords: | Compositae sesquiterpene lactones germacran-8 12-olide pyrazoline derivatives: new diterpenic acids |
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