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Inter- und intramolekulare Umlagerung der Sulfogruppe in 2-Naphtol-1-sulfonsäure
✍ Scribed by P. B. Fisher; H. Zollinger
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- German
- Weight
- 385 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The isomerisation of 2‐naphthol‐1‐sulfonic acid (potassium salt) into 2‐naphthol‐6‐sulfonic acid has been studied using labelled sulfuric acid (H~2~^35^SO~4~). In 40 to 50% aqueous sulfric acid the reaction takes place exclusively by an intermolecular mechanism (protio‐desulfonation and resulfonation). In glacial acetic acid, in the presence of an excess of sulfuric acid, the rearrangement is partly intramolecular. With an equimolar amount of sulfuric acid the rearrangement is completely intramolecular. This reaction is first order with respect to 2‐naphthol‐1‐sulfonic acid and zeroth order with respect to excess of sulfuric acid. A mechanism for the reaction is proposed.
📜 SIMILAR VOLUMES
## Abstract The reaction of 2‐naphthol‐1‐sulfonic acid with diazonium salts was investigated in the pH range 10 to 15. The structures postulated for the reaction products by __Rowe et al.__ [3] and by __Koller__ [4] were proved by instrumental analysis. In alkaline solutions, instead of the usual d