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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2398-2409 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ring Strain of Cycloalkynes and its Spectroscopic ConsequencesThe enthalpies of formation ΔHf and geometrical strain energies Eg. Sp. of cyclooctyne (1) and the three isomeric cyclooctenynes 5-7 are calculated with the MINDO/2-method on the basis of complete geometry optimizations. The frequencies of the C≡C-stretching vibrations (fig. 4) and the 13C-shifts of the acetylenic carbon atoms (fig. 6) obey quantitative correlations, which are very useful for the evaluation of geometrical ring strains.
    Notes: Bildungsenthalpien ΔHf und geometrische Ringspannungen Eg. Sp. für Cyclooctin (1) und die drei isomeren Cyclooctenine 5-7 werden nach der MINDO/2-Methode auf der Basis vollständiger Geometrie-Optimierungen berechnet. Mit den Frequenzen der C≡C-Valenzschwingungen (Abb. 4) und mit den 13C-Verschiebungswerten der acetylenischen Kohlenstoffatome (Abb. 6) ergeben sich quantitative Korrelationen, die zur Abschätzung von geometrischen Ringspannungen von großem Wert sind.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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