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CH140094A - Process for the preparation of a carbazole derivative. - Google Patents

Process for the preparation of a carbazole derivative.

Info

Publication number
CH140094A
CH140094A CH140094DA CH140094A CH 140094 A CH140094 A CH 140094A CH 140094D A CH140094D A CH 140094DA CH 140094 A CH140094 A CH 140094A
Authority
CH
Switzerland
Prior art keywords
preparation
carbazole derivative
dioxycarbazole
carbazole
recrystallization
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 CH140094A publication Critical patent/CH140094A/en

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  • Indole Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Description

  

  Verfahren zur Darstellung eines     Karbazolderivates.       Gegenstand vorliegender Erfindung ist  ein Verfahren zur Darstellung eines       Karbazolderivates,    dadurch     gekennzeiehnet,     dass man     1.8-Dioxykarbazol-3.6-disulfosäure          finit    Hilfe einer Mineralsäure unter Druck bei  Temperaturen von 170-180 o C in das 1.     8-          Dioxykarbazol    überführt.  



  <I>Beispiel:</I>  100     gr        1.8-Dioxykarbazol-3.        6-disulfosaures     Kalium, hergestellt zum Beispiel nach     DRP     224952, werden in 1400 cm,' 7     o/oiger    Schwe  felsäure gelöst und 6 Stunden im     Autoklav     bei 170-180 o Innentemperatur unter Rühren  erhitzt. Nach Erkalten wird das in langen  schwach bräunlich gefärbten Nadeln aus  kristallisierte Reaktionsprodukt abgesaugt  und neutral gewaschen.

   Das so erhaltene     1.8-          Dioxycarbazol    ist fast     schmelzpunktrein.    Zur    Analyse wird es durch Umkristallisation aus       Toluol    in langen Nadeln vom Schmelzpunkt  211-212 o erhalten.



  Process for the preparation of a carbazole derivative. The present invention relates to a process for the preparation of a carbazole derivative, characterized in that 1,8-dioxycarbazole-3,6-disulfonic acid is converted into 1,8-dioxycarbazole with the aid of a mineral acid under pressure at temperatures of 170-180 ° C.



  <I> Example: </I> 100 gr 1.8-Dioxykarbazol-3. Potassium 6-disulphonate, produced for example according to DRP 224952, is dissolved in 1400 cm, 7% sulfuric acid and heated for 6 hours in an autoclave at an internal temperature of 170-180 ° while stirring. After cooling, the reaction product, which has crystallized from long, pale brownish needles, is filtered off with suction and washed neutral.

   The 1,8-dioxycarbazole obtained in this way is almost pure at the melting point. For analysis it is obtained by recrystallization from toluene in long needles with a melting point of 211-212 o.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Karba- zolderivates, dadurch gekennzeichnet, dass man 1.8-Dioxykarbazol-3,6-distilfosäure mit Hilfe einer Mineralsäure unter Druck bei Temperaturen von 170-180o in das 1. 8- Dioxykarbazol überführt. Dieses Karbazol stellt nach dem Umkristallisieren aus Toluol lange Nadeln dar, welche bei 211-2120 schmelzen. Es soll als Ausgangsmaterial für Farbstoffe und Pharmazeutika Verwendung finden. PATENT CLAIM: Process for the preparation of a carbazole derivative, characterized in that 1,8-dioxycarbazole-3,6-distilfonic acid is converted into 1,8-dioxycarbazole with the aid of a mineral acid under pressure at temperatures of 170-180 °. After recrystallization from toluene, this carbazole represents long needles which melt at 211-2120. It should be used as a raw material for dyes and pharmaceuticals.
CH140094D 1928-01-02 1928-08-30 Process for the preparation of a carbazole derivative. CH140094A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE140094X 1928-01-02

Publications (1)

Publication Number Publication Date
CH140094A true CH140094A (en) 1930-05-31

Family

ID=5668063

Family Applications (1)

Application Number Title Priority Date Filing Date
CH140094D CH140094A (en) 1928-01-02 1928-08-30 Process for the preparation of a carbazole derivative.

Country Status (1)

Country Link
CH (1) CH140094A (en)

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