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  • 1975-1979  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2824-2826 
    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
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparative Organic Electrochemistry, III1) Selective Electrochemical Reduction of Δ8 Estratetraene Derivatives in Liquid Ammonia Stereoselectivity of the Birch Reduction in the Presence of AnilineElectrolysis of estratetraenes 1a-d in liquid ammonia with sodium chloride as electrolyte in an undivided cell gives estratrienes 2, reducing selectively the 8,9-double bond without further attack on the aromatic ring A. The stereoselectivity of the electrolytic reduction as well as that of the Birch reduction is dependent on added solvents, giving a mixture of natural and 9β-2. The influence a aniline of the stereoselectivity of the reduction is discussed.
    Notes: Durch Elektrolyse in flüssigem Ammoniak mit Natriumchlorid als Leitsalz wird die 8,9-Doppelbindung in den Östratetraenen 1a-d selektiv reduziert, ohne daß der aromatische A-Ring des entstandenen Östratriene 2 angegriffen wird. Die Stereoselektivität der elektrolytischen Reduktion und der Birch-Reduktion ist abhängig von Lösungsmittelzusätzen und führt zu einem Gemisch von natürlichem und 9β-2. Es wird ein Mechanismus diskutiert, der den Einfluß, von Anilin auf die Stereoselektivität der Reduktion erklärt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2631-2639 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparative Organic Electrochemistry, IV. Solvent Effects in the Electrochemical Reduction of Steroids with Aromatic A- and B-RingsElectrolysis of the 3-methyl ether derivatives of equilenine 4a, b in liquid ammonia gives the ring A reduced enolethers 5a, b, while the β-naphthol derivatives 8a-c and 11 give the isomeric products 9a, d or 9b, e, respectively, with a reduced A-ring. Reduction of the aromatic ring B can only be achieved by electrolysis in liquid methylamine. The configuration at C-3 of 9a-f can be proven unequivocally by spectrometric methods.
    Notes: Elektrolyse der Equilenin-3-methylether-Derivate 4a, b in flüssigem Ammoniak liefert die im Ring A reduzierten Enolether 5a, b, analog ergeben die β-Naphtholabkömmlinge 8a-c sowie 11 ein Gemisch der isomeren 3-Hydroxyverbindungen 9a, d. bzw. 9b, e mit reduziertem A-Ring. Eine Reduktion des B-Ringes gelingt nur durch Elektrolyse in flüssigem Methylamin. Die Konfiguration an C-3 von 9a-f wird spektrometrisch eindeutig ermittelt.
    Type of Medium: Electronic Resource
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