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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 683-693 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Silver Trifluoroacetate Initiated Reactions of Chlorotriphenylallene with Cyclopentadiene  -  Vinyl Cation Type Cycloadditions of Allenyl CationsChlorotriphenylallene (8) and cyclopentadiene react in the presence of equimolar amounts of silver trifluoroacetate to give a mixture of trifluoroacetates which hydrolyse to the alcohols 16-21. The intermediate triphenylallenyl cation (9) is exclusively attacked at the sp-terminus and undergoes addition as well as [2 + 2] and [4 + 2] cycloaddition reactions with cyclopentadiene. The experimentally observed lanthanide-induced chemical shifts of the protons of 17-21 agree well with values calculated on the basis of the McConnell equation.
    Notes: Chlortriphenylallen (8) reagiert mit Cyclopentadien in Gegenwart äquimolarer Mengen Silbertri-fluoracetat zu einem Gemisch von Trifluoressigsäureestern, deren Hydrolyse die Alkohole 16-21 ergibt. Das intermediär gebildete Triphenylallenyl-Kation (9) wird hierbei ausschließlich am sp-Terminus angegriffen und geht mit Cyclopentadien Additions- sowie [2 + 2]- und [4 + 2]- Cycloadditionsreaktionen ein. Die experimentell beobachteten Lanthaniden-induzierten chemischen Verschiebungen der Protonen der Alkohole 17-21 stimmen gut mit den nach der McConnell-Gleichung berechneten Werten überein.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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