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  • 1975-1979  (2)
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  • 1
    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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  • 2
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Isomeric N-Methylated (2-Furyl)- and (2-Thienyl)-pyrazolecarboxylates and Their Structure Elucidation by Spectrometric MethodsAddition of excessive diazomethane to (2-furyl)propiolic acid and ethyl (2-thienyl)propiolate, respectively, yields all four possible N-methylated pyrazolecarboxylates. After separation by means of gas chromatography the structures of the isomers were elucidated by 1H-NMR and UV spectroscopy. The gaschromatographically determined ratios of the isomers are discussed.
    Notes: Bei der Addition von überschüssigem Diazomethan an (2-Furyl)propiolsäure bzw. an (2- Thienyl)propiolsäure-äthylester erhält man alle vier möglichen N-methylierten Pyrazolcarbonsäureester. Nach gaschromatographischer Trennung der Isomeren werden die Strukturen durch 1H-NMR- und UV-Spektrometrie zugeordnet. Die gaschromatographisch bestimmten Isomerenverhältnisse werden diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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