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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1660-1669 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aminobenzenes, XV. Halo and Pseudohalo σ-Complexes of Symmetrical Tris(dialkylamino)benzenes - Synthesis and Characterization1,3,5-Tris(dialkylamino)benzenes 1 react with halides or dirhodane in inert solvents at low temperatures to give, in part isolable, cationic intermediates 2 (σ-complexes) of electrophilic aromatic substitution. Treatment of compounds 2 with base produces halo benzenes 4, reacidification of 4 gives rise to the identical σ-complexes 2. The stability of complexes 2 depends upon the different mesomeric stabilization by the various dialkylamino substituents.
    Notes: 1,3,5-Tris(dialkylamino)benzole 1 bilden mit Halogenen und Dirhodan in inerten Lösungsmitteln bei tiefen Temperaturen die zum Teil isolierbaren kationischen Zwischenverbindungen 2 (σ-Komplexe) der elektrophilen Aromatensubstitution. Mit Basen entstehen aus 2 durch Deprotonierung die Halogenbenzole 4, die mit Säuren wiederum die identischen σ-Komplexe 2 bilden. Die Stabilität der Komplexe 2 hängt von der unterschiedlichen Mesomeriestabilisierung durch die verschiedenen Dialkylaminosubstituenten ab.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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