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  • Chemistry  (3)
  • 13C  (1)
  • General Chemistry  (1)
  • Neoflavonoids  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1989), S. 553-557 
    ISSN: 0887-6134
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Fast atom bombardment (FAB) mass spectrometry is, for the first time, successfully applied to the underivatized anthracycline antibiotics retamycins E1 and E2, using bis-(2-hydroxyethyl)sulphide as the matrix compound. The spectra are characterized by abundant protonated molecular ions and also by a number of sequence ions, which can be easily rationalized in terms of the carbohydrate sequence in the molecules. The relative abundance of these ions seems to depend on the functionalities close to the glycosidic oxygen, and also on their stereochemical relationship. Structural results are also confirmed by the analysis of the FAB mass spectra of the acetyl derivatives.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1434-193X
    Schlagwort(e): Resorcin[4]arenes ; Cation interactions ; Interaction sites ; Configuration determination ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Resorcinarene octamethyl ethers, bearing carboalkyloxy groups in the side chains, have been shown to interact with FeIII in organic media. 1H-NMR studies, carried out using GaIII instead of FeIII, suggest that these systems have two active sites of interaction, the first located at the aromatic moiet and the other in the vicinity of the carbonyl groups. As a confirmation of this, resorcinarenes without carbonyl groups in the side chains have been found to exhibit only one active site. Notably, in the latter case the interaction results in configurational changes.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 1181-1183 
    ISSN: 0749-1581
    Schlagwort(e): 13C ; NMR chemical shifts ; Neoflavonoids ; 5,7-Dihydroxy- and 5,7-dimethoxy-4-arylcoumarins ; 2D NMR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The 13C NMR resonances of some 5,7-dihydroxy- and 5,7-dimethoxy-4-arylcoumarins were assigned by two-dimensional NMR experiments (HETCOR and LONG-RANGE HETCOR) on some key compounds.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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