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  • 1
    Electronic Resource
    Electronic Resource
    Natürlich vorkommende Terpen-Derivate, 109: Neue Eudesman-Derivate und andere Sesquiterpene aus Verbesina-Arten (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 254-263 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 109: New Eudesmane Derivatives and other Sesquiterpenes from Verbesina SpeciesThe investigation of some South American Verbesina species affords besides already known ones several new sesquiterpenes, their structures being elucidated by spectroscopic methods and some chemical reactions (5, 13-15, 18, 20, 22, 23, 25, 27, 29, 32, 33, and 35).
    Notes: Die Untersuchung einiger südamerikanischer Verbesina-Arten ergibt neben bereits bekannten mehrere neue Sesquiterpene, deren Konstitutionen durch spektroskopische Methoden und durch einige chemische Reaktionen geklärt werden (5, 13-15, 18, 20, 22, 23, 25, 27, 29, 32, 33 und 35).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110124
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  • 2
    Electronic Resource
    Electronic Resource
    Natürlich vorkommende Terpen-Derivate, 272. Über die Inhaltsstoffe von Zexmenia gnaphaloides und die Synthese von Valerenan-Derivaten (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2410-2423 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 272. On the Constituents of Zexmenia gnaphaloides and the Synthesis of Valerenane DerivativesThe investigation of a Mexican Zexmenia species afforded in addition to known compounds three new eudesmanolides (9-11) as well as five sesquiterpenes (31b, c, 33, 34a, b), the stereochemistry of which could not be established directly. Therefore the main compound 31c has been synthesized. By intramolecular diene synthesis the preparation of a suitable tetrahydroindane (19) was possible. From this, three of the possible four stereoisomeric aldehydes (23c, 24c, 30c) have been prepared. While one of the obtained aldehydes could be transformed into the compound isolated from the Zexmenia species (31c, obtained as ester 31a), the second one yielded valerenal (25c), one of the constituents of Valeriana officinalis. The thermodynamically most stable isomeric aldehyde 24c surprisingly is formed already under very mild conditions from both other aldehydes 23c and 30c.
    Notes: Die Untersuchung einer mexikanischen Zexmenia-Art ergibt neben bekannten Verbindungen drei neue Eudesmanolide (9-11), sowie fünf Sesquiterpene (31b, c, 33, 34a, b), deren Stereochemie nicht eindeutig geklärt werden konnte. Der Hauptvertreter 31c wurde daher synthetisch dargestellt. Durch intramolekulare Diensynthese gelingt die Darstellung eines geeigneten Tetrahydroindan-Derivates (19). Daraus wurden von vier möglichen stereoisomeren Aldehyden drei dargestellt (23c, 24c, 30c). Während einer der erhaltenen Aldehyde in die aus der Zexmenia-Art isolierten Verbindung 31c (als Ester 31a) übergeführt werden konnte, liefert der zweite Valerenal (25c), einen der Inhaltsstoffe aus Valeriana officinalis. Der thermodynamisch stabilste Aldehyd 24c entsteht überraschenderweise durch Isomerisierung aus beiden anderen Isomeren 23c und 30c bereits unter sehr milden Bedingungen.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130709
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  • 3
    Electronic Resource
    Electronic Resource
    Natürlich vorkommende Terpen-Derivate, 76. Über Inhaltsstoffe der Eupatorium-Gruppe (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 301-314 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 76. On Constituents of the Eupatorium GroupThe investigation of six Mexican species of the old genus Eupatorium which are now placed in the genera Ageratina, Critonia and Fleischmannia, yields two new sesquiterpenic acids (12 and 16), a cadinane derivative (40) and three sesquiterpene lactones (41, 57 and 58). In addition besides already known compounds eleven new thymol derivatives (3-10 and 46-48), four p-hydroxy-acetophenone derivatives (21, 26, 30 and 45), three benzyl benzoates (35-37), a flavanone (54) and a lignan (60) are isolated. The structures are established by spectroscopic data as well as by some chemical reactions. The chemotaxonomical aspects are discussed.
    Notes: Die Untersuchung von sechs mexikanischen Arten der alten Gattung Eupatorium, die jetzt in die Gattungen Ageratina, Critonia und Fleischmannia eingeordnet werden, ergibt zwei neue Sesquiterpensäuren (12 und 16), ein Cadinan-Derivat (40) und drei Sesquiterpenlactone (41, 57 und 58). Außerdem werden neben bereits bekannten Verbindungen elf neue Thymolderivate (3-10 und 46-48), vier p-Hydroxyacetophenon-Derivate (21, 26, 30 und 45), drei Benzoesäurebenzylester (35-37), ein Flavanon (54) und ein Lignan (60) isoliert. Die Konstitutionen werden durch spektroskopische Daten sowie durch einige chemische Reaktionen geklärt. Die chemotaxonomischen Aspekte werden diskutiert.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100132
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  • 4
    Electronic Resource
    Electronic Resource
    Natürlich vorkommende Terpen-Derivate, 117: Neue Sandaracopimardien-Derivate, Sesquiterpene und Sesquiterpenlactone aus Zexmenia-Arten (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 843-852 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 117 New Sandaracopimardiene Derivatives, Sesquiterpenes, and Sesquiterpene Lactones from Zexmenia SpeciesFrom two Zexmenia species two new sesquiterpenes (10 and 12), several new sandaracopimar-8(14),15-diene derivatives (15, 17-24, 26, and 27) and new sesquiterpene lactones (28-30) were isolated. The structures of these compounds have been elucidated by spectroscopic methods and some chemical reactions. The chemotaxonomical situation of the third group of the subtribe Verbesininae is discussed.
    Notes: Aus zwei Zexmenia-Arten werden zwei neue Sesquiterpene (10 und 12), mehrere neue Sandaracopimar-8(14),15-dien-Derivate (15, 17-24, 26 und 27) und drei neue Sesquiterpenlactone (28-30) isoliert. Die Konstitutionen werden durch spektroskopische Methoden und einige chemische Reaktionen geklärt. Die chemotaxonomische Situation der dritten Gruppe der Subtribus Verbesininae wird diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110304
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  • 5
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    Neue sesquiterpene aus Verbesina occidentalis☆ (1978)
    Elsevier
    Details
    Publication Date: 1978-01-01
    Print ISSN: 0031-9422
    Electronic ISSN: 1873-3700
    Topics: Biology , Chemistry and Pharmacology
    Published by Elsevier
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  • 6
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    Neue lignan-derivate aus der tribus heliantheae (1978)
    Elsevier
    Details
    Publication Date: 1978-01-01
    Print ISSN: 0031-9422
    Electronic ISSN: 1873-3700
    Topics: Biology , Chemistry and Pharmacology
    Published by Elsevier
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  • 7
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    Neue guajen-derivate aus Parthenium hysterophorus und ein weiteres pseudoguajanolid aus Ambrosia cumanensis (1977)
    Elsevier
    Details
    Publication Date: 1977-01-01
    Print ISSN: 0031-9422
    Electronic ISSN: 1873-3700
    Topics: Biology , Chemistry and Pharmacology
    Published by Elsevier
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