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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3585-3595 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Radical Ions, XXI: ESR Investigation of (H3C)3SiCH2 or (H3C)3Si Substituted Radical Cations of Anthracene, Biphenyl, and 9,10-DihydroanthraceneOne-electron oxidation using AlCl3 in H2CCl2 allows to generate the radical cations of 4,4′-bis(trimethylsilylmethyl)biphenyl (2), 9,10-bis(trimethylsilylmethyl)anthracene (1), and 9,10-bis(trimethylsilyl)-9,10-dihydroanthracene (3) which exist only at low temperatures. Their ESR spectra can be assigned via HMO models and confirm extensive spin delocalization as well as restricted conformational flexibility. For the 9,10-dihydroanthracene derivative a dihedral angle of ≍ 125° is estimated.
    Notes: Einelektronen-Oxidation mit AlCl3 in H2CCl2 ermöglicht es, die nur bei tiefer Temperatur existenzfähigen Radikalkationen von 4,4′-Bis(trimethylsilylmethyl)biphenyl (2), 9,10-Bis(trimethylsilylmethyl)anthracen (1) und 9,10-Bis(trimethylsilyl)-9,10-dihydroanthracen (3) zu erzeugen. Ihre hochaufgelösten ESR-Spektren lassen sich mit HMO-Modellen zuordnen und belegen weitgehende Spindelokalisation sowie eingeschränkte konformative Beweglichkeit. Für das 9,10-Dihydroanthracen-Derivat wird ein Diederwinkel von ≍ 125° abgeschätzt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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