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.

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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
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CH
Switzerland
Prior art keywords
sulfonic acid
naphthindole
methyl
preparation
condensation
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH161482A publication Critical patent/CH161482A/en

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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)

PATENTANSPRUCH: Verfahren zur Darstellung von 2-Methyl- f-naphthindol-5-sulfosäure, dadurch gekenn zeichnet, dass man 2-Naphthylhydrazin-7- sulfosäure mit Aceton kondensiert. Das neue Produkt kristallisiert in Form des Natriumsalzes in kleinen weissen Kri- ställchen. <B>UNTERANSPRÜCHE:</B> 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man die Kondensation in saurer Lösung vornimmt. 2. PATENT CLAIM: Process for the preparation of 2-methyl-f-naphthindole-5-sulfonic acid, characterized in that 2-naphthylhydrazine-7-sulfonic acid is condensed with acetone. The new product crystallizes in the form of the sodium salt in small white crystals. <B> SUBClaims: </B> 1. Method according to patent claim, characterized in that the condensation is carried out in an acidic solution. 2. Verfahren nach Patentanspruch und Unter anspruch 1, dadurch gekennzeichnet, dass man in Gegenwart von 10 o/oiger Essig säure arbeitet. 3. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man-die Kondensation in neutraler Lösung vornimmt. Process according to patent claim and sub-claim 1, characterized in that one works in the presence of 10% acetic acid. 3. The method according to claim, characterized in that the condensation is carried out in a neutral solution.
CH161482D 1931-03-19 1932-02-18 Process for the preparation of 2-methyl-B-naphthindole-5-sulfonic acid. CH161482A (en)

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

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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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