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- W2067590387 abstract "Zur Darstellung der dimeren Dehydro-L-ascorbinsaure (Bis-DHA) in hoher Ausbeute (90% d. Th.) und Reinheit wird L(+)-Ascorbinsaure in methanolischer Losung mit Luft bei Gegenwart von Palladium/Kohle behandelt, das Oxydationsprodukt in Nitromethan gelost und das Losungsmittel abdestilliert. Molekulargewichtsbestimrnungen in Dimethylformamid, Dimethylacetamid und Pyridin zeigen, daO Bis-DHA zu einer monomeren Form dissoziiert.A New Preparation of Dimer Dehydro-r-ascorbic Acid and its Dissociation in SolutionHighly pure dimer dehydro-L-ascorbic acid (Bis-DHA) is prepared in excellent yield (90 %) from L(+)-ascorbic acid in methanolic solution by air in the presence of palladium-carbon catalyst, dissolving the oxidation product in nitromethane and evaporation of the solvent. The determinations of the molecular weight in dimethylformamide, dimethylacetamide and pyridine show that bis-DHA dissociates to a monomer" @default.
- W2067590387 created "2016-06-24" @default.
- W2067590387 creator A5068363991 @default.
- W2067590387 date "1970-08-27" @default.
- W2067590387 modified "2023-10-01" @default.
- W2067590387 title "Eine neue Darstellung der dimeren Dehydro-L-ascorbinsäure und ihre Dissoziation in Lösung" @default.
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- W2067590387 doi "https://doi.org/10.1002/jlac.19707380126" @default.
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