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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 32 (1994), S. 452-457 
    ISSN: 0749-1581
    Keywords: NMR ; 1D TOCSY ; z-Filtering ; 2,7-Dioxatetracyclo[3.3.04,9.08,11]undeca-3,6-dione ; 8,10,11-Trioxapentacyclo[5.4.1.02,6.04,11.05,9]dodecane ; 2,8-Dioxatetracyclo[3.3.3.06.0.03,10]undecan-4-ol ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of one-dimensional total correlation spectroscopy (1D TOCSY) combined with the z-filtration technique to generate pure phase subspectra of individual isomers from the spectrum of the corresponding mixture without any chemical separation of the mixture is described. A straightforward spectral assignment is achieved for the isomers obtained on lithium aluminium hydride reduction of 2,7-dioxatetracyclo[3.3.04,9.08,11] undeca-3,6-dione (dilactone) by studying the subspectrum of each isomer as a function of the propagation time of magnetization through the network of coupled protons.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 656-666 
    ISSN: 0749-1581
    Keywords: Benzo-crown ethers ; NOESY and variable-temperature ; 13C NMR ; Complexation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structural changes during the complexation of benzo-crown ethers with Cs+, K+ and Na+ were studied by NOESY and variable-temperature 13C NMR spectroscopy. It was found that, on complexation, the distance between the CH-α and 1-CH2 is reduced in dibenzo-24-crown-8 (DB24C8), dibenzo-18-crown-6 and benzo-15-crown-5. Two mechanisms have been proposed for the distance reduction, the fluttering motion of the benzo group and the elongation of the crown moiety. However, it is concluded that both of these mechanisms seem to play a role in the distance reduction. In the complexed state of DB24C8 with Cs+, Cs+ is predicted to be slightly above the plane of the crown oxygens with respect to DB24C8.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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