CH161482A - Process for the preparation of 2-methyl-B-naphthindole-5-sulfonic acid. - Google Patents
Process for the preparation of 2-methyl-B-naphthindole-5-sulfonic acid.Info
- Publication number
- CH161482A CH161482A CH161482DA CH161482A CH 161482 A CH161482 A CH 161482A CH 161482D A CH161482D A CH 161482DA CH 161482 A CH161482 A CH 161482A
- Authority
- CH
- Switzerland
- Prior art keywords
- sulfonic acid
- naphthindole
- methyl
- preparation
- condensation
- Prior art date
Links
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung der 2-Nethyl-p-naplithindol-ö-sulfosäure. Es wurde gefunden, dass man 2-112ethyl- R-naphthindol-5-sulfosäure erhält, wenn man 2-Naphthylhydrazin-7-sulfosäure mit Aceton, vorteilhaft in Gegenwart von 10 o/oiger Essig säure, kondensiert. Als Kondensationsmittel kann man hierbei die bekannten Konden sationsmittel anwenden, beispielsweise Eis essig. Man kann aber auch in neutraler Lö sung arbeiten, oder in schwach saurer, wie verdünnter Essigsäure.
Das neue Produkt kristallisiert in Form des Natriumsalzes in kleinen weissen Kriställohen. Es soll als Zwi schenprodukt bei der Herstellung von Farb stoffen Verwendung finden.
<I>Beispiel:</I> 12 kg 2-Naphthylhyärazin-7-sulfosäure werden mit 60 kg 10 /oiger Essigsäure und 80 kg Aceton einige Stunden unter Druck auf etwa 120 erhitzt. Es scheidet sich dabei die 2-Methyl-,B-naphthindol-5-sulfosäure zum grossen Teil als NRL-Salz aus. Der Rest wird in der Natronlauge ausgefällt. Zu gleich guten Ausbeuten gelangt man, wenn man in neu traler Lösung, zum Beispiel Wasser oder etwas verdünntem Alkohol, arbeitet. In Eis essig findet die Kondensation bereits bei 100 statt.
Auch lassen sich in diesem Falle statt der freien Sulfosäure die Salze der Naphtyl- hydrazin-sulfosäuren verwenden.
Process for the preparation of 2-methyl-p-naplithindole-δ-sulfonic acid. It has been found that 2-112ethyl-R-naphthindole-5-sulfonic acid is obtained when 2-naphthylhydrazine-7-sulfonic acid is condensed with acetone, advantageously in the presence of 10% acetic acid. The known condensation agents can be used as condensation agents, for example glacial vinegar. But you can also work in a neutral solution, or in weakly acidic, such as dilute acetic acid.
The new product crystallizes in the form of the sodium salt in small white crystals. It should be used as an inter mediate product in the manufacture of dyes.
<I> Example: </I> 12 kg of 2-naphthylhyärazine-7-sulfonic acid are heated to about 120 for a few hours under pressure with 60 kg of 10% acetic acid and 80 kg of acetone. The 2-methyl-, B-naphthindole-5-sulfonic acid is largely eliminated as the NRL salt. The rest is precipitated in the sodium hydroxide solution. The same good yields can be achieved if one works in neutral solution, for example water or a little dilute alcohol. In glacial vinegar, condensation takes place at 100.
In this case, the salts of naphthylhydrazine sulfonic acids can also be used instead of the free sulfonic acids.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE161482X | 1931-03-19 | ||
CH159149T | 1932-02-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH161482A true CH161482A (en) | 1933-04-30 |
Family
ID=25717200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH161482D CH161482A (en) | 1931-03-19 | 1932-02-18 | Process for the preparation of 2-methyl-B-naphthindole-5-sulfonic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH161482A (en) |
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1932
- 1932-02-18 CH CH161482D patent/CH161482A/en unknown
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