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  • Wiley-Blackwell  (5)
  • 1985-1989  (4)
  • 1980-1984  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Macrocyclische Trichothecene aus Baccharis coridifolia, II Miotoxin D und Isomiotoxin D, zwei neue macrocyclische Trichothecene aus Baccharis coridifolia DC (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 633-639 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Macrocyclic Trichothecenes from Baccharis coridifolia, II. - Miotoxin D and Isomiotoxin D, Two New Macrocyclic Trichothecenes from Baccharis coridifolia DCFrom the chloroform extract of the toxic South Brazilian plant Baccharis coridifolia, two further macrocyclic trichothecenes were isolated. The structures of these new substances, named miotoxin D (2a) and isomiotoxin D (2b), were elucidated by two-dimensional NMR techniques and FD-mass spectrometry.
    Notes: Aus dem Chloroformextrakt der toxischen südbrasilianischen Pflanze Baccharis coridifolia wurden zwei weitere macrocyclische Trichothecene isoliert. Die Strukturen dieser neuen, als Miotoxin D (2a) und Isomiotoxin D (2b) bezeichneten Substanzen wurden durch zweidimensionale FT-NMR-Techniken und FD-Massenspektroskopie aufgeklärt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850325
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  • 2
    Electronic Resource
    Electronic Resource
    Eliminierungsreaktionen und Umlagerungen bei 14β-Hydroxy-12-sulfonyloxy-Steroiden (1988)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 149-156 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elimination Reactions and Rearrangement of 14β-Hydroxy-12-sulfonyloxy SteroidsElimination of 12α- or 12β-(methylsulfonyloxy)-14β-hydroxy steroids proceeds under rearrangement of the steroid nucleus. From the 12α-sulfonyloxy compound of 19 the (12βH)-14(13→12)abeo-13(18)-ene steroid 21 is obtained, whereas the 14β-hydroxy-(12βH)-17(13→12)abeo-13(18)ene compounds 14, 20 result from the 12β-methylsulfonyloxy derivatives of the steroids 13, 18. Structures were determined by means of 2D-NMR analyses and decoupling experiments. The theoretical explanation of this rearrangement leads to the possibility of an elimination of the 12α-methylsulfonyloxy group to yield the Δ11-alkene (28). This is possible by steric fixation of the migrating C-atoms at positions 14 and 17 in the 20,14β-lactone (26, 27).
    Notes: Eliminierung der 12α- oder 12β-Methylsulfonyloxy-Gruppe in 14β-Hydroxy-Steroiden erfolgt unter Umlagerung des Steroidgerüstes. Hierbei entsteht aus der 12α-Sulfonyloxy-Verbindung von 19 das 14β-Hydroxy-(12β-H)-14(13→12)abeo-13(18)en-Steroid 21, während die 14β-Hydroxy-(12βH)-17(13→12)abeo-13(18)-en-Verbindungen 14, 20 aus 12β-Mesyloxyderivaten der Steroide 13, 18 erhalten werden. Die Strukturbestimmung wurde mit 2D-NMR-Spektroskopie und Entkopplungs-Experimenten durchgeführt. Das theoretische Verständnis dieser Umlagerungen ergibt die Möglichkeit, durch Eliminierung der 12α-Mesyloxy-Gruppe auch Δ11-Steroide (28) zu erhalten. Hierzu müssen die wanderungsfähigen C-Atome an Position 14 und 17 im 20,14β-Lacton (26, 27) sterisch fixiert sein.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198819880208
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal Structure and NMR Spectrometric Analysis of Palmarin (1989)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 485-487 
    Details
    ISSN: 0170-2041
    Keywords: Chasmanthin ; Palmarin ; Palmatoside A and B ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The crystal structure of palmarin (1) has been determined by X-ray diffraction. The ring C conformation was confirmed to be that of a half chair, and the same result was obtained from 1H-NMR spectrometry. The ring C of chasmanthin (2) and glucosides of 1 and 2 (palmatoside A, and B) was also decided as a half boat by analysis of the 1H-NMR spectra.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198919890185
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  • 4
    Electronic Resource
    Electronic Resource
    Macrocyclische Trichothecene aus Baccharis coridifolia, I Miotoxin B und C, zwei neue macrocyclische Trichothecene aus Baccharis coridifolia DC (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1746-1754 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Macrocyclic Trichothecenes From Baccharis coridifolia, I. - Miotoxin B and C, two New Macrocyclic Trichothecenes From Baccharis coridifolia DCFrom extracts of the toxic Brazilian plant Baccharis coridifolia, two further macrocyclic trichothecenes were isolated. The structures of these compounds, named by us as miotoxin B and C, were elucidated by application of mass spectrometry and homo- and heteronuclear two-dimensional NMR techniques.
    Notes: Aus Extrakten der brasilianischen Giftpflanze Baccharis coridifolia wurden zwei macrocyclische Trichothecene isoliert. Die Strukturen der von uns als Miotoxin B und C bezeichneten Substanzen wurden durch Massenspektroskopie und durch homo- und heteronucleare zweidimensionale FT-NMR-Techniken aufgeklärt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419841015
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  • 5
    Electronic Resource
    Electronic Resource
    13C NMR spectra of 5β,14β-hydroxysteroidsPresented at the 4th North German NMR Meeting, Braänschweig, 10 May 1985. (1985)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 23 (1985), S. 959-963 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C chemical shifts of 30 substituted 5β,14β-hydroxysteroids are described and discussed. Substituent chemical shifts for 12α- and 12β-hydroxy groups were evaluated, and interesting γ effects were observed. A correlation is shown to exist between the 1H shifts of H-17 and the 13C shifts of C-17 for various C-12 substituents. A relationship for the distance of the substituent at C-12 from H-17 in the 14β,20-lactones was demonstrated, where an increased distance between these atoms is associated with smaller shift differences.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260231115
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