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Über die Oxydation von Ascorbinsäure durch salpetrige Säure Teil II: Die säurekatalysierte Reaktion. 14. Mitteilung über Reduktone und Tricarbonylverbindungen

✍ Scribed by H. Dahn; Lotte Loewe


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

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✦ Synopsis


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.


📜 SIMILAR VOLUMES


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; 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 Oxydation von Ascorbinsäure dur
✍ H. Dahn; Lotte Loewe; C. A. Bunton 📂 Article 📅 1960 🏛 John Wiley and Sons 🌐 German ⚖ 937 KB

## 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.

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.