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  • 5,7-Dihydroxy- and 5,7-dimethoxy-4-arylcoumarins  (1)
  • Configuration determination  (1)
  • Polymer and Materials Science  (1)
Material
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Keywords
  • 1
    ISSN: 1434-193X
    Keywords: Resorcin[4]arenes ; Cation interactions ; Interaction sites ; Configuration determination ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---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.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 228 (1995), S. 25-40 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Triglycidylisocyanurat (TGIC) wurde aus dem Harzgemisch der Reaktionsprodukte von Cyanursäure und Epichlorhydrin durch Kristallisation aus Methanol getrennt. Die Fraktionen der Kristallisation wurden durch chemische Analyse, IR-Spektroskopie, hochaufgelöste 1H-NMR- und 13C-NMR-Spektroskopie, simultane thermische Analyse und DSC-Analyse getrennt charakterisiert. Die Struktur der beiden diastereomeren Racemate von TGIC (α- und β-TGIC) wurde mit Hilfe der hochaufgelösten NMR-Spektroskopie untersucht, und die Spektren wurden berechnet. Es wurde gefunden, daß die aus Methanol kristallisierte, hochschmelzende Fraktion (Schmelzpunkt: 156°C) dem β-diastereomeren Racemat von TGIC entspricht. Alle anderen aus Methanol kristallisierten Fraktionen (Schmelzpunkte im Bereich von 100-103°C) enthalten sowohl das α- als auch das β-diastereomere Racemat. Rekristallisieren aus Methanol liefert beide diastereomeren Racemate, was auf die Bildung von gemischten Kristallen hinweist.
    Notes: Triglycidyl isocyanurate (TGIC) was separated from the resinous reaction product of cyanuric acid and epichlorohydrin by crystallization from methanol. The crystallization fractions were separately characterized by means of functional group analysis, IR-spectroscopy, high-resolution 1H-NMR and 13C-NMR spectroscopy, simultaneous thermal analysis and DSC. The structure of the two diastereomer racemates of TGIC (β-TGIC and α-TGIC) was studied by using high-resolution NMR spectroscopy and the 1H-NMR spectra were calculated for both. It was found that the high-melting fraction (m. p. 156°C) which precipitated from the methanol-solution relates to the β-diastereomeric racemate of TGIC. All other methanol-soluble or slightly soluble fractions crystallized from the methanol solution (melting range 100-103°C) represent the α-diastereomer racemate of TGIC, with the β-diastereomer racemate always being present. Recrystallization from methanol always resulted in the presence of both diastereomers. This may indicate the presence of mixed crystals.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 1181-1183 
    ISSN: 0749-1581
    Keywords: 13C ; NMR chemical shifts ; Neoflavonoids ; 5,7-Dihydroxy- and 5,7-dimethoxy-4-arylcoumarins ; 2D NMR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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