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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vernocistifolides and Other Sesquiterpene Lactones from Vernonia and Related SpeciesThe investigation of the aerial parts of 17 Vernonia, one Struchium, one Muschleria, one Centratherum, and one Gongrothamnus species afforded in addition to known sesquiterpene lactones 37 new ones: 13 vernocistifolides (1-13), the related triacetate 14, the enollactone 15, the glaucolides 16, 19, 29-33, 35, and 36, two representatives of a new type of dilactones (27 and 28), the elemanolides 37, 43, and 44, the germacranolides 38, 39, 42, 47, and 48, the eudesmanolides 40 and 41 as well as the centratherin derivative 51. The structures and the stereochemistry were elucidated by high-field NMR techniques. The chemotaxonomy and the biogenetic relationships are discussed briefly.
    Notes: Die Untersuchung der oberirdischen Teile von 17 Vernonia-Arten, einer Struchium-, einer Muschleria-, einer Centratherum- und einer Gongrothamnus-Art liefert, neben bekannten, 37 neue Sesquiterpenlactone: 13 Vernocistifolide (1-13), das verwandte Triacetat 14 und das Enollacton 15, die Glaucolide 16, 19, 29-33, 35 und 36, zwei Vertreter eines neuen Dilacton-Typs (27 und 28), die Elemanolide 37, 43 und 44, die Germacranolide 38, 39, 42, 47 und 48, die Eudesmanolide 40 und 41 sowie das Centratherin-Derivat 51. Die Strukturen und die Stereochemie werden durch Hochfeld-NMR-Techniken geklärt. Die Chemotaxonomie und die biogenetischen Beziehungen werden kurz diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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