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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 23 (1971), S. 195-202 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe von semi-empirischen SCF Berechnungen (INDO) werden die Barrieren der inneren Rotation in substituierten Carbodiimiden vorhergesagt. Die für Dimethylcarbodiimid berechneten Barrieren zeigen sehr gute übereinstimmung mit den für die alkylsubstituierten Moleküle beobachteten Werten. Es kann ferner gezeigt werden, da\ Substituenten mit einem einsamen Elektronenpaar die StabilitÄt der Konfiguration des Stickstoffs auch in diesem Falle erheblich erhöhen. Andererseits erhÄlt man im Falle des Dicyanocarbodiimids ein sehr flexibles Molekül, das keine Barriere der inneren Rotation aufweist.
    Notes: Abstract Semi-empirical SCF calculations (INDO) are used to predict barriers to internal motion in substituted carbodiimides. The barriers calculated for dimethylcarbodiimide yield no great surprises and are in excellent agreement with that observed for an alkyl substituted molecule. We also demonstrate, as found for other systems, that a substituent bearing a lone pair of electrons gives considerable nitrogen configurational stability. On the other hand, cyano substitution seems to yield a molecule that is extremely flexible with essentially no barrier to internal rotation or inversion.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1974-12-01
    Print ISSN: 0021-9584
    Electronic ISSN: 1938-1328
    Topics: Chemistry and Pharmacology , Education
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