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  • 1975-1979  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 793-795 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2969-2977 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensed Ring Systems, XII. On the Influence of the Carbocycle on the Reaction Course of the Ramberg-Bäcklund Reaction of OxathiapropellanesBy modification of our previous specifications for the syntheses of dithiapropellanes, oxathiapropellanes 1-5 are synthesized on a preparative scale. The configurations of monochloro-oxathiapropellane dioxides 11-16 obtained from 2-5 are elucidated. The transformation of 11-16 into the analogous oxapropellenes 17-19 is dependent on the ring size of the carbocycles. 3-Oxa[3.3.2]propell-9-ene (17) is obtained in about 1% yield only, and thus represents the oxapropellene with the smallest carbocycle preparable by this synthetic route.
    Notes: Durch Abänderung unserer früheren Synthesevorschrift für die Dithiapropellane werden die Oxathiapropellane 1-5 in präparativem Maßstab hergestellt. Die Konfigurationen der aus 2-5 erhaltenen Monochloroxathiapropellandioxide 11-16 werden aufgeklärt. Die Überführung von 11-16 in die entsprechenden Oxapropellene 17-19 ist von der Ringgröße des Carbocyclus abhängig. Das 3-Oxa[3.3.2]propell-9-en (17) entsteht nur in ca. 1 proz. Ausb. und ist damit das Oxapropellen mit dem kleinsten Carbocyclus, das nach diesem Syntheseweg hergestellt werden kann.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 796-798 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensed Ring Systems, XIII. Elucidation of Constitutions and Configurations of Isomeric Dichlorodithiapropellane Tetroxides with the Aid of 13C NMR SpectroscopyDithiapropellanes 1 with n 〉 1 can be converted to the isomeric dichlorodithiapropellane tetroxides 2 (n = 2-5), while 1 with n = 1 decomposes under identical reaction conditions. Even mild oxidation of 3,7-dithia[3.3.1]propellane (1, n = 1) with hydrogen peroxide in glacial acetic acid at room temperature results in elimination of sulfur dioxide and isomerisation to 3,5-dimethylene-tetrahydrothiopyran-1,1-dioxide (5). The constitutions and configurations of the isomeric dichlorodisulfones 2 (n = 2-5) are elucidated with the aid of 13C NMR spectroscopy. - The dichlorodisulfones 2 can be converted to 1,4-polymethylene-Dewar benzenes 3 by a double Ramberg-Bäcklund reaction only if the saturated carbocycle contains at least four methylene groups.
    Notes: Aus den Dithiapropellanen 1 mit n 〉 1 lassen sich die isomeren Dichlordithiapropellantetroxide 2 (n = 2-5) herstellen, während sich 1 mit n = 1 unter den gleichen Reaktionsbedingungen zersetzt. Schon bei der gelinden Oxidation des 3,7-Dithia[3.3.1]propellans (1, n = 1) mit Wasserstoffperoxid in Eisessig bei Raumtemperatur bildet sich unter Abspaltung von Schwefeldioxid und Isomerisierung das 3,5-Dimethylen-tetrahydrothiopyran-1,1-dioxid (5). Die Konstitutionen und Konfigurationen der isomeren Dichlordisulfone 2 (n = 2-5) werden mit Hilfe der 13C-NMR-Spektroskopie aufgeklärt. - Die Dichlordisulfone 2 lassen sich durch doppelte Ramberg-Bäcklund-Reaktion nur dann in die 1,4-Polymethylen-Dewar-Benzole (3) überführen, wenn der gesättigte Carbocyclus mindestens vier Methylengruppen enthält.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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