Phytochemistry p. 1679 - 1692 (1982)
Update date:2022-08-29
Topics:
Bohlmann, Ferdinand
Zdero, Christa
Ahmed, Maniruddin
The investigation of three Geigeria species and five subspecies afforded, in addition to known compounds, the following 32 new compounds: two geigeranolides with a new carbon skeleton, two xanthanolides, five guaianolides, three pseudoguaianolides, a sesquiterpene related to ivaxillarin, a nerolidol derivative, 15 geranyllinalol derivatives, two thiophene acetylenes and a dimeric coniferyl isobutyrate.The structures and the stereochemistry of the new compounds were elucidated by spectroscopic methods and a few chemical transformations.Chemotaxonomic aspects and relationships of the compounds are discussed. - Key Word Index: Geigeria aspera; G. brevifolia; G. burkei subsp.; Compositae; Inuleae; sesquiterpene lactones; guaianolides; pseudoguaianolides; xanthanolides; geigeranolides; diterpenes; geranyllinalol derivatives; thiophene acetylenes; nerolidol derivative; new carbon skeleton.
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