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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 449-462 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Mechanism of the Thermolysis of 1-Pyrazolines)Thermolysis of 1 -pyrazolines containing electron withdrawing groups in position 3 has been thoroughly investigated with reference to product distribution and kinetic parameters. The results point to a two-step mechanism in protonic solvents. Steric effects can lead to the preference of a one-step process. Copper salts accelerate the decomposition and completely reverse the product distribution in favour of the cyclopropane derivatives.
    Notes: Die Thermolyse von 1 -Pyrazolinen mit Elektronenakzeptorgruppen in 3-Stellung wird bezüglich Produktverteilung und kinetischen Parametern eingehend untersucht. Die Ergebnisse deuten darauf hin, daß in protonischen Lösungsmitteln bevorzugt ein zweistufiger Zerfall stattfindet. Sterische Effekte können jedoch auch zur Bevorzugung eines einstufigen Prozesses führen. Kupfersalze beschleunigen die Zersetzung und verursachen eine völlige Umkehr des Produktverhältnisses zugunsten der Cyclopropanderivate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 635-648 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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