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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 3293-3301 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organic Lewis Acids, 331) The Photochemistry of Cyclic Acylals of Alkylidene-, Alkenylidene-, and Benzylidenemalonic AcidsThe photochemistry of the title compounds 1 resembles that of α,β-unsaturated esters. Observed reactions include deconjugation (→ 2), β, δ-cyclopropane ring closure(→ 4), and [2 + 2]-cycloaddition (→ 5, 7, 8) as well as ene-type addition to olefins (→ 9). Reaction mechanism and preparative aspects are discussed.
    Notes: Die Photochemie der Titelverbindungen 1 entspricht der von α,β-ungesättigten Estern: Dekonjugation zu 2, β,δ-Cyclopropanbildung (→ 4) und [2 + 2]-Cycloaddition (→ 5, 7, 8) sowie substituierende Addition an Olefine (→ 9) Reaktionsmechanismus und präparative Aspekte werden diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    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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