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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sterically Hindered Alkenes, IV. Preparation of Some Octamethylcycloalkylidenecycloalkanes and Related CompoundsSixteen “tied back” derivatives of tetra-tert-butylethene of type 4 were prepared via the thiadiazoline and selenadiazoline routes, resp. Strain in 4 increases with increasing number of ring members. The compounds 4m, n, p, and q represent the alkenes of highest fragmentation strain prepared so far, and the limit for the utility of the present synthetic methods. The causes for the failure of these methods in the synthesis of yet more highly strained alkenes are discussed.
    Notes: Mit Hilfe der Thiadiazolin- und Selenadiazolin-Methode wurden 16 neue überbrückte Derivate des Tetra-tert-butylethens vom Typ 4 dargestellt. Mit wachsender Ringgliederzahl nimmt die Spannung in 4 zu. Die Grenzen der erwähnten Synthesewege liegen für die Alkene bei 4m, n, p und q; sie stellen die Alkene höchster Fragmentierungsspannung dar, die bisher isoliert wurden. Die Ursachen für das Versagen dieser Methoden bei der Synthese sterisch noch stärker gehinderter Alkene werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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