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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of natural products 58 (1995), S. 284-287 
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 301-314 
    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
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 2008-2020 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Clerodane Derivatives and Novel Diterpenes From Conyza scabrida DCThe careful separation of the extract of the aerial parts of Conyza scabrida afforded in addition to known compounds 12 new clerodane derivatives and 9 diterpenes with unusal carbon skeletons which most likely were formed in part by electrocyclic transformations of the clerodanes. The structures were elucidated by NMR studies. The chemotaxonomic situation is discussed briefly.
    Notes: Die sorgfältige Trennung des Extraktes der oberirdischen Teile von Conyza scabrida ergibt neben bereits bekannten Verbindungen 12 neue Clerodan-Derivate und 9 Diterpene mit ungewöhnlichen Kohlenstoffgerüsten, die wahrscheinlich teilweise durch elektrocyclische Umwandlungen der Clerodane gebildet werden. Die Strukturen werden durch NMR-Untersuchungen geklärt. Die chemotaxonomische Situation wird kurz diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1367-1376 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 5-Methylcoumarin Derivatives from Lycoseris latifoliaFrom the aerial parts of Lycoseris latifolia nine coumarin derivatives were isolated which most likely are formed biogenetically by condensation of 4-hydroxy-5-methylcoumarin with a sesquiterpene aldehyde followed by various transformations and degradations. The structures were elucidated by high-field NMR spectroscopy. NOE difference spectroscopy allowed an unequivocal assignment of all configurations. The chemotaxonomic relevance of these compounds is discussed briefly.
    Notes: Aus oberirdischen Teilen von Lycoseris latifolia wurden neun Cumarin-Derivate isoliert, die sehr wahrscheinlich biogenetisch durch Kondensation von 4-Hydroxy-5-methylcumarin mit einem Sesquiterpenaldehyd gebildet werden, wonach sich verschiedene Umwandlungen und Abbaureaktionen anschließen. Die Strukturen wurden durch Hochfeld-NMR-Spektroskopie geklärt. NOE-Differenzspektroskopie ermöglichte eine eindeutige Zuordnung aller Konfigurationen. Die chemotaxonomische Bedeutung dieser Verbindungen wird kurz diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 2922).  -  The First Sesquiterpene Lactone with an Allenic GroupHerrn Prof. Dr. K. Dimroth zum 70. Geburtstag gewidmet.In addition to some known triterpenes, from the aerial parts of Vernonia cotoneaster Less, was isolated the sesquiterpene lactone vernonallenoid (4) which most probably is the first allenic derivative in this series.
    Notes: Neben einigen bekannten Triterpenen isoliert man aus den oberirdischen Teilen von Vernonia cotoneaster Less, das Sesquiterpenlacton Vernonallenoid (4), bei dem es sich um das erste Allenderivat in dieser Reihe handeln dürfte.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 1257-1266 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Steiractinolides from Aspilia and Wedelia SpeciesThe reinvestigation of the polar fractions of Aspilia parvifolia afforded eight further steiractinolides and one geranylgeraniol derivative. The aerial parts of a new Wedelia species gave three derivatives of 4,5-dihydrosteiractinolides. The structures were elucidated by detailed 1H NMR studies. The configurations of some eudesmanolides from Wedelia trilobata were corrected and the absolute configuration of the steiractinolides has been determined by using the Horeau method.
    Notes: Die erneute Untersuchung der polaren Fraktionen von Aspilia parvifolia ergibt acht weitere Steiractinolide und ein Geranylgeraniol-Derivat. Die oberirdischen Teile einer neuen Wedelia-Art liefern drei Derivate von 4,5-Dihydrosteiractinolid. Die Strukturen werden durch eingehende 1H-NMR-Untersuchungen geklärt. Die Konfigurationen einiger Eudesmanolide aus Wedelia trilobata werden korrigiert, und die absolute Konfiguration der Steiractinolide wird mit Hilfe der Horeau-Methode bestimmt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Spirosesquiterpenelactones, Germacranolides, and Eudesmanolides from Wunderlichia mirabilisA reinvestigation of the aerial parts of Wunderlichia mirabilis afforded in addition to known compounds ten sesquiterpenelactones, three cis-12,6-germacranolides (7-9), three eudesmanolides (11, 13 and 14), an elemanolide (12) which may be an artifact, and three rearranged eudesmanolides, the spiro compounds 17-19 as well as ylangenyl acetate (1). The structures were elucidated by high-field 1H NMR spectroscopy and some chemical transformations. The stereochemistry of wunderolide (10) and of two onoseriolide (24 and 25) derivatives, which were isolated previously, are corrected.
    Notes: Eine erneute Untersuchung der oberirdischen Teile ovn Wunderlichia mirabilis ergibt zusätzlich zu bekannten Verbindungen zehn Sesquiterpenlactone, drei cis-12,6-Germacranolide (7-9), drei Eudesmanolide (11, 13 und 14), ein Elemanolid (12), das ein Artefact sein könnte, und drei umgelagerte Eudesmanolide, die Spiroverbindungen 17-19 sowie Ylangenylacetat (1). Die Strukturen werden durch Hochfeld-1H-NMR-Spektroskopie und einige chemische Umwandlungen geklärt. Die Stereochemie von Wunderolid (10) und von zwei Onoserioliden (24 und 25), die früher isoliert wurden, wird korrigiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1474-1477 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Rudbeckiolide, a Dimeric Sesquiterpene Lactone from Rudbeckia laciniataRoots of Rudbeckia laciniata afforded in addition to known compounds minute amounts of an unusual dimeric sesquiterpene lactone (9). Its constitution was elucidated by detailed 1H NMR spectroscopy, and the stereochemistry followed from the couplings observed and especially from the results of NOE difference spectroscopy.
    Notes: Wurzeln von Rudbeckia laciniata ergeben neben bekannten Verbindungen in sehr kleiner Menge ein ungewöhnliches dimeres Sesquiterpenlacton (9). Dessen Konstitution konnte durch eingehende 1H-NMR-spektroskopische Untersuchungen, die Stereochemie aus den beobachteten Kopplungen sowie vor allem durch die Ergebnisse der NOE-Differenzspektroskopie geklärt werden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 2342-2351 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: cis-Guaianolides from Osmitopsis asteriscoidesA reinvestigation of the aerial parts of the South African Composite Osmitopsis asteriscoides afforded six further guaianolides with a cis-12,6-lactone ring which is only present in this species, a seco-guaiane derivative, and two pairs of epimeric menthene derivatives. The structures and the stereochemistry were elucidated by high-field 1H and 13C NMR spectroscopy and some chemical reactions. The taxonomy of the genus Osmitopsis is discussed briefly.
    Notes: Die erneute Untersuchung oberirdischer Teile der südafrikanischen Composite Osmitopsis asteriscoides ergab sechs weitere Guajanolide mit einem cis-12,6-Lactonring, der nur in dieser Pflanze vorkommt, ein seco-Guajan-Derivat und zwei Paare epimere Menthen-Derivate. Die Strukturen und die Stereochemie wurden durch Hochfeld-1H- und 13C-NMR-Spektroskopie sowie einige chemische Reaktionen geklärt. Die Taxonomie der Gattung Osmitopsis wird kurz diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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