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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 186-190 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaktionen mit 2-Methyl- und 2-Styryl-4-thiochromonenDiazoalkane reagieren mit 2-Methyl- und 2-Styryl-4-thiochromonen zu 1,3-Dithiolanen 1 und/oder Ethylenen 2-4. Letztere werden mit Thionylchlorid zu den entsprechenden Ketonen gespalten während beim Schmelzen mit Schwefel die entsprechenden Thioketone entstehen. 2-Methyl-und 2-Styryl-4-thiochromone kondensieren mit CH-aciden Verbindungen wie Malononitril und Cyanessigsäure-ethylester zu 5. Oxidation der 2-Methyl- und 2-Styryl-4-thiochromone mit gelbem Quecksilber(II)-oxid oder mit Tetrahalogen-o-benzochinon ergibt die entsprechenden Ketone. Die biologische Aktivität ausgewählter Verbindungen gegenüber Gram-positiven und Gramnegativen Bakterien wurde untersucht.
    Notes: Diazoalkanes react with 2-methyl- and 2-styryl-4-thiochromones to yield the 1,3-dithiolanes 1 and/or ethylenes 2-4. The latter are cleaved with thionyl chloride to give the corresponding ketones, while on fusion with sulfur they afford the corresponding thioketones. By condensation with compounds containing active hydrogen, such as malononitrile and ethyl cyanoacetate, the 2-methyl- and 2-styryl-4-thiochromones yield the compounds 5. Oxidation of 2-methyl- and 2-styryl-4-thiochromones was accomplished by yellow mercury(II) oxide as well as with tetrahalo-o-benzoquinones to give the corresponding ketones. The biological activity of some selected compounds prepared during this work has been tested towards Gram-positive and Gram-negative bacteria.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 481-482 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Propane-1,3-sultone (1) reacts with phenylhydrazine as well as with acid hydrazides yielding the corresponding sulphonic acids 2a-f in good yields. On reaction of 2,4-dimethyl-1,3-butadiene-1,4-sultone (3) with hydrazides by fusion or in a nonpolar solvent, the sultams 4a-f are obtained, and in alcohols the corresponding sulphonic acids 5a-d or the hydrazine derivative 6 are obtained.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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