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Über die Oxydation von Ascorbinsäure durch salpetrige Säure Teil III: Kinetik im Gebiet der Taylor'schen Gleichung. 15. Mitteilung über Reduktone und Tricarbonylverbindungen

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


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

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✦ Synopsis


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 1700 times more reactive in aqueous dioxan.


📜 SIMILAR VOLUMES


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

## 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 📂 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; 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.