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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aromatic Phosphines with Second Order Substituents, XVI1).  -  Phenylogous PO-activated Olefination: Synthesis of 4′-Donator Substituted 4-(Diphenylphosphinyl)stilbenesBeing a  -  M substituent, the 4-diphenylphosphinyl group acidifies the methyl group of toluene to a similar degree as a 4-cyano group. The carbanion formed by deprotonation reacts with N-benzylidene anilines to yield 4-(diphenylphosphinyl)stilbenes. In these, UV-spectroscopically the phosphorus on the one hand behaves like a  -  M substituent, on the other hand it acts as a barrier to through-conjugation.
    Notes: Als  -  M-Substituent acidifiziert eine 4-Diphenylphosphinyl-Gruppe die Methylgruppe des Toluols ähnlich stark wie eine 4-Cyangruppe. Das durch Deprotonierung entstehende Carbanion reagiert mit N-Benzylidenanilinen zu 4-(Diphenylphosphinyl)stilbenen. In ihnen erweist sich der Phosphor UV-spektroskopisch einerseits als Konjugationssperre, andererseits als mesomer wirksamer Substituent.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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