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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 683-698 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bromination and Dehydrobromination in the Side Chains of 1,2,3-ThiadiazolesThe bromination of 1,2,3-thiadiazoles with N-bromosuccinimide (NBS) is investigated. The monobromides 3 and 4 and the dibromides 5 and 6 can be isolated. Several methods have been used for the introduction of double bonds by the elimination of HBr. Besides the elimination products 9, 11, 12, and 14 the substitution products 10, 13, 15, 16, and 17 are obtained. A lot of regio- and stereoselectivities can be observed.
    Notes: Bei den 1,2,3-Thiadiazolen 2a-h wird die Bromierung mit N-Bromsuccinimid (NBS) untersucht. Es können die Monobromide 3 und 4 sowie die Dibromide 5 und 6 isoliert werden. Zur Einführung von Doppelbindungen unter HBr-Abspaltung werden mehrere Verfahren geprüft. Neben den Eliminierungsprodukten 9, 11, 12 und 14 erhält man die Substitutionsprodukte 10, 13, 15, 16 und 17. Man beobachtet dabei eine Reihe von Regio- und Stereoselektivitäten.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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