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  • Analytical Chemistry and Spectroscopy  (1)
  • Conservation  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Energy Economics 4 (1982), S. 83-97 
    ISSN: 0140-9883
    Keywords: Conservation ; Energy ; UK
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 648-653 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Proton and carbon magnetic resonance spectra of mono-and disubstituted selenophenes are investigated. The proton chemical shifts are discussed in terms of magnetic anisotropy and electric field effects of the substituents, with a view to studying the conformational equilibrium of the carbonyl group. π Electronic charges, computed by the PPP method, are correlated with the proton and carbon chemical shifts. The coupling constants between 13C and 1H (1, 2 or 3 bonds) and 13C—77Se are shown to be good structural parameters and a set of substituent additivity constants is calculated.
    Notes: Une série de sélénophènes mono- et bisubstitués est étudiée en résonance de 1H et 13C. Les déplacements chimiques protoniques sont analysés en termes d'effets d'anisotropie et de champ électrique des substituants et utilisés à une discussion des équilibres conformationnels. Les relations entre δ1H et δ13C et les charges π calculées par la méthode PPP sont examinées. Les couplages 1J(13C—H), nJ(13C ∼ H) et 1J(13C—77Se) se révèlent de bonnes caractéristiques structurales et des relations d'additivité sont dégagées pour δ13C.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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