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Über die Oxydation von Ascorbinsäure durch salpetrige Säure Teil VI: Übersicht und Diskussion der Ergebnisse. 18. Mitteilung über Reduktone und 1,2,3-Tricarbonylverbindungen

✍ Scribed by H. Dahn; Lotte Loewe; C. A. Bunton


Publisher
John Wiley and Sons
Year
1960
Tongue
German
Weight
937 KB
Volume
43
Category
Article
ISSN
0018-019X

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✦ Synopsis


Abstract

The oxidation of ascorbic acid and phenylhydroxytetronic acid by nitrous acid at various values of pH follows four distinct rate laws, discussed in parts II, III and IV of the present series of papers.


📜 SIMILAR VOLUMES


Über die Oxydation von Ascorbinsäure dur
✍ H. Dahn; Lotte Loewe 📂 Article 📅 1960 🏛 John Wiley and Sons 🌐 German ⚖ 524 KB

## Abstract In 0.1 to 0.5 M perchloric acid the oxidation by nitrous acid of the two reductones, ascorbic acid and phenyl hydroxytetronic acid, follows the rate law k has been determined for both reductones in aqueous dioxan and for ascorbic acid in water.

Über die Oxydation von Ascorbinsäure dur
✍ H. Dahn; Lotte Loewe 📂 Article 📅 1960 🏛 John Wiley and Sons 🌐 German ⚖ 421 KB 👁 1 views

## Abstract At pH ca. 4 the rate of oxidation of ascorbic acid and of phenylhydroxytetronic acid by nitrous acid in the presence of excess nitrite ions is found to be independent of reductone concentration. The rate law is k~2~ was evaluated both in water and in aqueous dioxan. Under the same cond

Über die Oxydation von Ascorbinsäure dur
✍ H. Dahn; Lotte Loewe; C. A. Bunton 📂 Article 📅 1960 🏛 John Wiley and Sons 🌐 German ⚖ 238 KB 👁 1 views

## Abstract Addition of azide ions considerably slows down the oxidation of ascorbic acid by nitrous acid. At a pH of about 2 an approximately 10 fold excess of hydrazoic acid over ascorbic acid changes the rate law found in part III into This is identical with the rate law found in 0·1 to 0·5 M a

Über die Oxydation von Ascorbinsäure dur
✍ H. Dahn; Lotte Loewe; E. Lüscher; R. Menassé 📂 Article 📅 1960 🏛 John Wiley and Sons 🌐 German ⚖ 451 KB 👁 1 views

## Abstract Oxidation of ascorbic acid by nitrous acid at pH 0 to 5 follows the stoechiometric equation: This was shown by potentiometric titration of the ascorbic acid and by gas analysis.

Über die Oxydation von Ascorbinsäure dur
✍ H. Dahn; Lotte Loewe; C. A. Bunton 📂 Article 📅 1960 🏛 John Wiley and Sons 🌐 German ⚖ 393 KB 👁 1 views

## Abstract At pH ca. 2 the oxidation of reductones by nitrous acid follows the rate law Both k and k were determined for ascorbic acids in water and in aqueous dioxan and for phenylhydroxytetronic acid in water. The reductonate anions are about 200 times more reactive than the acids in water and

Über die Reaktion von dehydro-ascorbinsä
✍ H. Dahn; H. Moll 📂 Article 📅 1964 🏛 John Wiley and Sons 🌐 German ⚖ 621 KB

€IELVETICA CBIMlCA ACTA Die Mikroanalysen wurden in unserem Mikrolaboratorium in Basel (Leitung Dr. DIRSCHERL), die TJV.-und 1R.-Spektren in unserer physiko-chemischen Abteilung in Base1 (Dr. WURSCH, Dr. CHOPARD) ausgefuhrt bzw. aufgenommen. Fur wertvolle Hilfe bei der Interpretation der NMR.-Spektr