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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1918-1927 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [1,5]-Sigmatropic Ester Shift in the Pentakis(methoxycarbonyl)cyclopentadiene System5-Alkyl-pentakis(methoxycarbonyl)cyclopentadienes (1) equilibrate at 100°C with 1-alkyl-pentakis(methoxycarbonyl)cyclopentadienes (2) via 1,5-sigmatropic ester shifts. At higher temperatures a further ester shift generates the 2-alkyl-pentakis(methoxycarbonyl)cyclopentadienes (3). The intramolecular character of the rearrangement is demonstrated by crossover experiments.
    Notes: 5-Alkyl-pentakis(methoxycarbonyl)cyclopentadiene (1) äquilibrieren bei 100°C durch [1,5]-sigmatrope Esterverschiebung mit 1-Alkyl-pentakis(methoxycarbonyl)cyclopentadienen (2). Bei höheren Temperaturen führt eine weitere Esterverschiebung zu 2-Alkyl-pentakis(methoxycarbonyl)cyclopentadienen (3). Der intramolekular Verlauf der Umlagerung wurde durch Kreuzungsversuche gesichert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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