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  • 1
    Electronic Resource
    Electronic Resource
    Chiral recognition by 1H-NMR, EPR, and ENDOR spectroscopy (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 5 (1993), S. 282-287 
    Details
    ISSN: 0899-0042
    Keywords: phenoxyl radicals ; hydrogen bond ; host guest interactions ; diastereomers ; absolute configuration ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chiral recognition with magnetic methods requires the formation of diastereomers. Due to the variety of appropriate reactions, hydrogen bond formation, esterification, and acetalization as well as host-guest interactions were chosen for basic investigations. The results obtained indicate that in the case of diamagnetic compounds the chemical shifts and for paramagnetic compounds the β-proton coupling constants are the most useful parameters. By combination of both pieces of information, assignment of the absolute configuration was achieved. © 1993 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530050418
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, EPR, ENDOR and TRIPLE resonance investigations of anthracycline-related semiquinones (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 468-471 
    Details
    ISSN: 0749-1581
    Keywords: Anthracycline semiquinones ; EPR ; ENDOR ; TRIPLE ; Conformation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of five substituted anthraquinones related to anthracyclines is described. One-electron reduction of these compounds yields the corresponding semiquinones, which were characterized by EPR, ENDOR and TRIPLE resonance spectroscopy. The data indicate a rapid conformational interconversion of the cyclohexene moiety (ring A in the anthracyclines). The low-temperature structures could be assigned to half-chair conformers whose splitting constants and torsion angles were obtained by simple calculations. Introduction of substituents in the 4-position, disturbing the symmetry of the anthraquinone, results in remarkable changes in the spin density distribution, in contrast to published results. A reinterpretation and assignment of known anthraquinone radicals is presented.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260310510
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    Paper (German National Licenses)
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