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  • 1970-1974  (3)
  • Chemistry  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    NMR stereotopic induced shifts in epimeric mixturesContribution No. 377 from the Instituto de Química, UNAM. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 291-293 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton NMR spectra of epimeric mixtures of menthone (1), carvomenthone (2), carquejone (3), 2,5-dimethyl-1,4-cyclohexanedione (4) and piqueridione (5) were studied using the chemical shift reagent Eu(DPM)3. The results allow quantifications of the epimers and some conformational assignments to be made.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050609
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Long-range proton-proton interactions through epoxidesThis paper is Part IV of the series ‘Analysis by Nuclear Magnetic Resonance’. For Part III, see ref. 1. (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 193-200 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Double and triple nuclear magnetic resonance experiments performed at 100 MHz demonstrate the existence of long range 1H - 1H couplings through epoxides. In a series of epoxycontaining sesquiterpenoids, interactions between protons separated by up to six sigma bonds were detected. These interactions may have origins similar to the well-known allylic and homoallylic couplings found in carbon-carbon double bonded compounds, although they are much smaller in the epoxy systems. We propose to name them as ‘epoallylic’ and ‘epohomoallylic’ interactions. Some couplings are observed directly, whereas in other cases only an improvement in resolution is seen during multiple irradiation experiments. Even in these latter cases the areas of the observed peak do not change upon multiple irradiation which demonstrates the absence of nuclear Overhauser effects. The stereochemistry of some asymmetric centers of the compounds studied is deduced from the spectra.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030205
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Multiple NMR analysis of the affinin (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 1-5 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The configuration of the insecticidal and medicinal lipid ‘affinin,’ N-isobutyldeca-trans-2, cis-6, trans-8-trienamide, may be assigned in an unequivocal manner by NMR spectroscopy. The spectral data and the advantages of the multiple irradiation methods are presented and discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030102
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    Paper (German National Licenses)
    Fulltext
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