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  • Lactones  (1)
  • benzopyridines  (1)
  • Wiley-Blackwell  (2)
  • Blackwell Publishing Ltd
  • 1995-1999  (2)
  • 1975-1979
  • 1998  (2)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (2)
  • Blackwell Publishing Ltd
Years
  • 1995-1999  (2)
  • 1975-1979
Year
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of a Key Building Block for a Butyrolactone → 1,3-Diol Approach to the Polyol Part of Roflamycoin (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 1031-1043 
    Details
    ISSN: 1434-193X
    Keywords: Carbonates, ring-opening ; Epoxides, ring-opening ; Lactones ; Reduction, diastereoselective ; Polyalcohols ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: For preparing tris(γ-lactone) 3 the mono(γ-lactone) 6 was synthesized from the dichlorodiol 12 (99.8% ee). Bisepoxide 9 - derived from dichlorodiol 12 (99.8% ee) - was ring-opened with the Gilman cuprate from 2-lithio-1,5-hexadiene and CuI giving almost exclusively the monoepoxide 21; in five more steps, γ-lactone 30 with the same stereotriad as the target molecule 6 but a different protecting group was obtained. Monoepoxide 33 - also derived from dichlorodiol 12 - was ring-opened with the same Gilman cuprate affording compound 35. It was transformed into the correctly protected γ-lactone 6 in seven steps, key reactions being the ozonolysis 35 → 36 and the diastereoselective reduction 36 → anti-37.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    A spectroscopic study of the hydrogen bonding and π-π stacking interactions of harmane with quinoline (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 4 (1998), S. 185-195 
    Details
    ISSN: 1075-4261
    Keywords: hydrogen bonding ; van der Waals ; betacarbolines ; benzopyridines ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: A spectroscopic (UV-vis, Fourier transform IR, steady state, and time-resolved fluorescence) study of the interactions of the ground and excited singlet states of harmane (1-methyl-9H-pyrido/3,4-b/indole) with quinoline has been carried out in cyclohexane, toluene, and buffered pH = 8.7 aqueous solutions. To analyze how the number of rings in the substrate influences these interactions, pyridine and phenanthridine have also been included in this study. In cyclohexane and toluene 1 : 1 stoichiometric hydrogen-bonded complexes are formed in both the ground and the excited singlet states. As the number of rings of the benzopyridines and the solvent polarity increase hydrogen-bonding interactions weaken and π-π van der Waals interactions become apparent. © 1998 John Wiley & Sons, Inc. Biospectroscopy 4: 185-195, 1998
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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