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  • Artikel: DFG Deutsche Nationallizenzen  (2)
  • Analytical Chemistry and Spectroscopy  (2)
  • 1
    Digitale Medien
    Digitale Medien
    A 1H and 13C NMR study of methoxyretinoids. Spectral assignment and determination of configurationPart 4 of the series ‘Retinoids’ (for Part 3, see Ref. 1). (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 296-300 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A number of modified retinals and retinoic esters carrying one or two methoxy groups or one methoxy and one methyl group on the polyene chain were investigated by 1H and 13C NMR spectroscopy. Spectral assignments were made from homo- and selective 13C{1H} hetero-decoupling experiments and from chemical shift comparisons. The configurations of the polyene double bonds were derived from vicinal H,H coupling constants, from 1H and 13C chemical shifts and by measuring nuclear Overhauser enhancements. It is found that all double bonds with no additional substituents occur in the trans (E) and all methoxy-substituted double bonds in the cis (also E) configuration. Double bonds carrying methyl groups give rise to both cis (Z) and trans (E) isomers.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270220505
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    1H and 13C NMR spectra of multibridged [2n]cyclophanes (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 669-676 
    Details
    ISSN: 0749-1581
    Schlagwort(e): 1H NMR chemical shifts ; 13C NMR chemical shifts ; H,H coupling constants ; Cyclophanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The 1H and 13C NMR spectra of all [2n] cyclophanes with the same substitution pattern in both benzene rings and of the skew [2.2.2](1,2,4)(1,2,5)cyclophane were assigned by one-dimensional NOE difference and two-dimensional correlation spectroscopy. The 1H NMR spectra of the bridge protons including the 13C satellites of the symmetrical compounds [2.2]paracyclophane, [2.2.2](1,3,5)cyclophane and superphane were analysed by iterative methods. Chemical shifts and H,H coupling constants are discussed with regard to molecular geometries.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260310713
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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