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  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 380-386 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Reaction of Quaternary Salts of 2-Chloro Heterocycles with Amines and PhenolN-Alkyl-2-chloro-substituted benzimidazolium-, 3H-indolium-, benzthiazolium- and quinolinium tetrafluoroborates 1 are attacked by the heteroatom of nucleophiles such as phenols, thiophenols, or N-alkylanilines. N,N-Dimethylaniline does not react with the benzimidazolium salt, but attacks the salts of the other three bases to yield 4 with a carbon-carbon bond between C-2 of the heterocycle and C-4 of the N,N-dimethylaniline. Rearrangements of the C—X to give a C—C bond in analogy to the chemistry of aromatic diazo compounds were not observed; however, exchange of an O- for an N-substituent proved to be possible. With pyrocatechol the spiro compound 5 could be prepared. Surprisingly the salts obtained yield good mass spectra with mostly high parent peaks. Valuable information about stabilities, particularly in the phenol series, can be deduced from the fragmentation products.
    Notes: N-Alkyl-2-chlor-substituierte Benzimidazolium-, 3H-Indolium-, Benzthiazolium- und Chinolinium-tetrafluoroborate 1 werden stets durch das Heteroatom X von Nucleophilen wie Phenolen, Thiophenolen oder N-Alkylanilinen angegriffen, wobei die Salze 3 entstehen. N,N-Dialkylanilin reagiert nicht mit dem Benzimidazoliumsalz, wird jedoch von den Salzen der drei anderen Basen unter Bildung von 4 mit einer C—C-Bindung zwischen C-2 des Heterocyclus und C-4 des N,N-Dimethylanilins angegriffen. Eine “Umkupplung” der C—X-Bindung von 3 zu einer C—C-Bindung nach Type 4 in Analogie zur Chemie aromatischer Diazoverbindungen wird nicht beobachtet. Jedoch gelingt der Austausch eines O- durch einen N-Substituenten. Mit Brenzkatechin wurde das Spiran 5 erhalten. Die dargestellten Salze liefern überraschenderweise gute Massenspektren mit größtenteils hohen Molekülpeaks. Die Zerfallsprodukte geben insbesondere in der Phenolreihe interessante Aufschlüsse über ihre Stabilität.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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