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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 660-671 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Cyclic Mono-or Dialkynes and Butadiene; Ring Expansion by 4, 8, and 16 C-AtomsCyclic mono- and dialkynes can be co-oligomerized with two or four molecules of butadiene to di- and tricyclic cis-1,cis-4,trans-7-cyclodecatriene derivatives. Cyclododecyne, 1,8-cyclotetradecadiyne, and 5-oxa-1,8-cyclotetradecadiyne have been subjected to such reaction. Partial hydrogenation of the ten-membered rings formed and their oxidative cleavage to di- and tetraketones lead to a ring enlargement by 8 or 16 carbon atoms. It is shown using as example the cyclodecatriene derivative formed from cyclododecyne and two molecules of butadiene, that the same reactions lead (after thermal rearrangement of the ten-membered rings to the correspondending cis-4,5-divinylcyclohexenes) to a ring enlargement by 4 C-atoms and simultaneous introduction of two ethyl groups.
    Notes: An Nickel-Ligand-Katalysatoren lassen sich cyclische Mono- und Dialkine mit zwei oder vier Molekülen Butadien zu di- bzw. tricyclischen cis-1, cis-4, trans-7-Cyclodecatrienderivaten verknüpfen. Als Alkine wurden Cyclododecin, 1,8-Cyclotetradecadiin und 5-Oxa-1,8-cyclotetradecadiin eingesetzt. Partielle Hydrierung der gebildeten Zehnringe und deren oxidative Spaltung zu Di- oder Tetraketonen führt zu einer Ringerweiterung um 8 bzw. 16 C-Atome. Am Beispiel des Cyclodecatrienderivates aus Cyclododecin und zwei Molekülen Butadien wird gezeigt, daß die gleichen Reaktionen nach thermischer Umlagerung der Zehnringe in die entsprechenden cis-4,5-Divinylcyclohexene zu einer Ringerweiterung um 4 C-Atome und gleichzeitiger Einführung einer Diäthylgruppierung führen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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