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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 537-539 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The proton NMR spectrum and carbon-13 satellites of partially oriented propyne give the complete structure of this molecule. Agreement with microwave results is excellent.
    Notes: Le spectre protonique ainsi que les satellites du carbone-13 du propyne orienté dans un solvant nématique permettent d'accéder à la structure complète de cette molécule. L'accord avec les résultats obtenus par spectroscopie micro-onde est excellent.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 451-462 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR spectra of disubstituted ethers with the formula (X—CH2—CH2)2O, X = Cl, Br, I, have been studied. Spectra of neat liquids at ambient temperature and spectra of these compounds in CS2 at different temperatures have been analysed. It has been possible to assign the chemical shifts. In each case, the more populated rotamers have been determined. Additionally, for these three compounds dissolved in CS2, it is shown that the gauche form becomes more stable with cooling. The authors propose a procedure, using spectral decomposition, which allows the analysis of AA′BB′spectra almost degenerated in A2B2 cases.
    Notes: Les spectres RMN d′éthers disubstitués de formule (X—CH2—CH2)2O avec X = Cl, Br, I, d′une part, à température ambiante et à l′état pur et, d′autre part, en solution dans CS2 et à différentes températures, ont été analysés avec précision. Les déplacements chimiques de chacun des groupements CH2 ont pu ětre attribués. Les rotaméres prépondérants ont été déterminés à l′état pur et à différentes températures. De plus, il est montré que pour ces trois halogénures dissous dans CS2, les formes gauches relatives à chaque branche deviennent plus stables en refroidissant. Les auteurs ont mis au point une procédure permettant, par décomposition de raies, de traiter les spectres de type AA′BB′ ayant l′aspect de spectres de type A2B2.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 767-778 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Solvent effects on compounds of formula (X—CH2—CH2)2O with X = Cl, Br, I have been studied. The rotamer ratios have been determined for each solvent according to Lin's method and it is shown that the three compounds moved to gauche forms when increasing the medium dielectric constant.Additionally, it is shown that geminal couplings of the iodine derivative algebraically decrease on increasing the medium polarity. An attempt to correlate these variations with rotamer populations is made.
    Notes: L'effet de solvant sur les éthers disubstitués de formule (X—CH2—CH2)2O avec X = Cl, Br, I a été étudié. Les pourcentages des différentes formes stables ont été déterminés pour chaque solvant suivant la méthode de Lin et il est montré que ces trois halogénures évoluent vers les formes gauches quand la constante diélectrique de la solution augmente.De plus, il est montré que les couplages géminés dans le cas du dérivé iodé diminuent algébriquement quand la polarité du solvant augmente. Les auteurs pésentent une tentative de corrélation des variations des couplages géminés avec l'évolution conformationnelle.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 571-572 
    ISSN: 0749-1581
    Keywords: Methylenecyclopropane ; 1H and 13C NMR ; Liquid crystal ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H and 13C NMR spectra of methylenecyclopropane, both in the isotropic phase and in the Merck IV nematic phase, were analysed. The relative signs of the 13C—H scalar coupling constants were determined. The complete geometry deduced from this study was compared with that from a microwave study, and the discrepancies are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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