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  • 1
    Electronic Resource
    Electronic Resource
    Magnetization transfer NMR study of nitrogen inversion in 2,2-dimethylaziridine (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. 664-668 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; 13C NMR ; aziridines ; pyramidal nitrogen inversion ; inversion rate constant ; slow exchange spin locking ; 2D exchange spectroscopy ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The slow inversion at pyramidal nitrogen in 2,2-dimethylaziridine was investigated by NMR spectroscopy at 304 K using one-dimensional spin locking methods and two-dimensional exchange spectroscopy. The activation free energy was found to be 17.5 kcal mol-1 (73.2 kJ mol-1) at this temperature. This value represents a lower limit for the unimolecular inversion barrier height as autocatalytic and water-catalyzed inversion pathways can in principle also contribute to the observed rate. The spin locking experiments described employ non-selective pulses and are particularly useful for the quantitative study of slow chemical exchange between nuclei of similar resonance frequency where selective magnetization transfer experiments are difficult or impossible.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260330808
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  • 2
    Electronic Resource
    Electronic Resource
    Assignment of the 1H and 13C NMR spectra of naphtho [1′,2′:4,5]thieno[2,3-c]quinoline using two-dimensional NMR spectroscopy (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 779-785 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; 13C NMR ; Assignments of naphtho[1′,2′:4,5]thieno[2,3-c]quinoline ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H NMR spectrum of naphtho [1′,2′:4,5]thieno[2,3-c]quinoline is highly congested because all the protons are in an aromatic environment, and the structure of the molecule is nearly symmetric. With this in mind, the assignment of the 1H and 13C NMR spectra of this compound obtained using two-dimensional NMR spectroscopy is reported.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260300815
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    Paper (German National Licenses)
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