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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3757-3777 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Synthesis of 2-Imino-3.4-dihydro-2H-1.3-benzothiazin-4-ones and 4-Imino-3.4-dihydro-2H-1.3-benzothiazin-2-onesTreatment of 3-chloro-1.2-benzisothiazolium chlorides 1 with formamides 2 results in ring-expansion and formation of 2-imino-3.4-dihydro-2H-1.3-benzothiazin-4-ones 3 and 4-imino-3.4-dihydro-2H-1.3-benzothiazin-2-ones 6. The quantitative ratio 3/6 depends on the formamide 2 used and the reaction conditions. For the compounds 3 only the Z-form is observed, whereas for 6 with one exception only the E-form is found.
    Notes: 3-Chlor-1.2-benzisothiazoliumchloride 1 reagieren mit Formamiden 2 unter Ringerweiterung zu 2-Imino-3.4-dihydro-2H-1.3-benzothiazinonen-(4) 3 und 4-Imino-3.4-dihydro-2H-1.3-benzothiazinonen-(2) 6. Das Mengenverhältnis 3/6 hängt vom eingesetzten Formamid 2 und von den Reaktionsbedingungen ab. Für die Verbindungen 3 wird nur die Z-Form und für 6, mit einer Ausnahme, nur die E-Form beobachtet.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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