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  • Chemistry  (1)
  • 2020-2022
  • 1970-1974  (1)
  • 1972  (1)
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  • 2020-2022
  • 1970-1974  (1)
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    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 755 (1972), S. 191-193 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of 2,3,4,6-Tetramethyl-D-glucono-1.5-lactoneBy one-step-methylation with dimethyl sulfate in presence of Ba(OH)2 and BaO α-methyl-D-glucopyranoside is converted to α-methyl-2,3,4,6-tetramethyl-D-glucopyranoside using dimethylformamide/dimethyl sulfoxide (5 : 2) as solvent.  -  The permethylated product is saponified specifically at the glycosidic group by a strongly acidic cation exchanger giving 2,3,4,6-tetramethyl-D-glucopyranose. This compound is oxidized with bromine and the corresponding tetramethylgluconic acid obtained is converted to the lactone in the conventional way.
    Notes: Durch einstufige Methylierung mit Dimethylsulfat in Gegenwart von Ba(OH)2 und BaO wird α-Methyl-D-glucopyranosid unter Verwendung von Dimethylformamid/Dimethylsulfoxid (5 : 2) als Lösungsmittel in das α-Methyl-2.3.4.6-tetramethyl-D-glucopyranosid übergeführt.  -  Das permethylierte Produkt wird mittels stark sauren Kationenaustauschers spezifisch an der glykosidischen Gruppe verseift. Die entstandene 2.3.4.6-Tetramethyl-D-glucopyranose wird durch Brom zur entsprechenden Tetramethylgluconsäure oxydiert und diese auf üblichem Wege zum Lacton umgesetzt.
    Type of Medium: Electronic Resource
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