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  • 13C-NMR Spectroscopy  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 122 (1991), S. 529-532 
    ISSN: 1434-4475
    Keywords: Ultrasound ; Sonochemistry ; Bipyridines ; 13C-NMR Spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Obwohl die Ultraschall-Reaktionen von Brombenzol und 2-, 3- und 4-Halogenpyridinen mit Lithiumdraht inTHF die erwarteten Dimeren ergeben, tritt auch ein beträchtliches Ausmaß an Dehalogenierung ein. Es wird ein möglicher Mechanismus für die ungewöhnliche Bildung von 4,4′-Bipyridyl aus 2-Halogenpyridin vorgeschlagen. Aus den Reaktionen von 2-Brom-4-methylchinolin und 7-Brom-2,4-dimethylchinolin resultierten keine dimeren Produkte. Das synthetische Potential der sonochemischen Dehalogenierung wird diskutiert.
    Notes: Summary Although sonochemical reactions of bromobenzene and of 2-, 3- and 4-halogenopyridines with lithium wire inTHF solution yield the expected dimers, considerable dehalogenation also occurs, as monitored by13C-NMR spectroscopy. A pathway for the unusual formation of 4,4′-bipyridyl from the 2-halogenopyridines is proposed. No dimers were detected from the reactions with 2-bromo-4-methylquinoline and 7-bromo-2,4-dimethylquinoline. The synthetic potential of their alternative facile sonochemical dehalogenation is propounded.
    Type of Medium: Electronic Resource
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