CH161224A - Process for the preparation of 9-ethyl-2-oxycarbazole-3-carboxylic acid. - Google Patents

Process for the preparation of 9-ethyl-2-oxycarbazole-3-carboxylic acid.

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Publication number
CH161224A
CH161224A CH161224DA CH161224A CH 161224 A CH161224 A CH 161224A CH 161224D A CH161224D A CH 161224DA CH 161224 A CH161224 A CH 161224A
Authority
CH
Switzerland
Prior art keywords
ethyl
oxycarbazole
carboxylic acid
preparation
acid
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 CH161224A publication Critical patent/CH161224A/en

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Description

  

  Verfahren zur Darstellung von     9-Äthyl-2-ogycarbazol-3-carbonsäure.       Es wurde gefunden, dass man     9-Äthyl-2-          oxycarbazol-3-carbonsäure    dadurch erhalten  kann, dass man     9-Äthyl-2-oxycarbazol    in Ge  genwart eines Alkalis bei erhöhter Tempera  tur mit Kohlensäure unter Druck behandelt  und die freie Säure aus ihrem     Alkalisalz     abscheidet, zum Beispiel mit Hilfe einer Mi  neralsäure. Die     9-Äthyl-2-oxycarbazol-3-car-          bonsäure    kristallisiert aus     Toluol    in farb  losen Nadeln vom Schmelzpunkt 229  . Sie  ist ein wertvolles Zwischenprodukt zur Her  stellung von Farbstoffen.  



       Beispiel:     38 Gewichtsteile     9-Äthyl-2-oxycarbazol     (Nadeln aus verdünntem Alkohol, Schmelz  punkt 109 bis<B>110')</B> werden in bekannter  Weise in das     Kaliumsalz    verwandelt. Dieses  wird mit 100 Gewichtsteilen     Kaliumkarbonat     vermischt und in einen     Autoklaven    ein  gefüllt. Nach     Aufpressen    von Kohlensäure  wird innerhalb 3 bis 4 Stunden auf 210 bis  220' Innentemperatur angeheizt und bei 40  bis 60     Atm.    etwa 8 bis 10 Stunden bei die-         ser    Temperatur gehalten.

   Nach Erkalten  wird der     Autoklaveninhalt    in heissem Wasser  gelöst, eventuell filtriert und mit Mineral  säure angesäuert. Die neue     Carbonsäure    fällt  aus. Aus     Toluol    kristallisiert sie in farb  losen Nadeln. Schmelzpunkt 229  .



  Process for the preparation of 9-ethyl-2-ogycarbazole-3-carboxylic acid. It has been found that 9-ethyl-2-oxycarbazole-3-carboxylic acid can be obtained by treating 9-ethyl-2-oxycarbazole in the presence of an alkali at elevated temperature with carbonic acid under pressure and removing the free acid from it Alkali salt separates, for example with the help of a mineral acid. 9-Ethyl-2-oxycarbazole-3-carboxylic acid crystallizes from toluene in colorless needles with a melting point of 229. It is a valuable intermediate for the manufacture of dyes.



       Example: 38 parts by weight of 9-ethyl-2-oxycarbazole (needles made from dilute alcohol, melting point 109 to <B> 110 ') </B> are converted into the potassium salt in a known manner. This is mixed with 100 parts by weight of potassium carbonate and filled into an autoclave. After forcing in carbonic acid, the temperature is raised to 210 to 220 'internal temperature within 3 to 4 hours and at 40 to 60 atm. held at this temperature for about 8 to 10 hours.

   After cooling, the contents of the autoclave are dissolved in hot water, filtered if necessary and acidified with mineral acid. The new carboxylic acid precipitates. It crystallizes from toluene in colorless needles. Melting point 229.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung von 9-Äthyl- 2-oxycarbazol-3-carbonsäure, dadurch gekenn zeichnet, dass man auf 9-Äthyl-2-oxycarbazol in Gegenwart eines Alkalis Kohlensäure un ter Druck und bei erhöhter Temperatur ein wirken lässt und die freie Säure aus ihrem Alkalisalz abscheidet. Die neue Säure kristallisiert aus Toluol oder Alkohol in farblosen Nadeln vom Schmelzpunkt 229 und ist ein wertvolles Zwiseb.enprodukt zur Herstellung von Farb stoffen. Claim: Process for the preparation of 9-ethyl-2-oxycarbazole-3-carboxylic acid, characterized in that carbonic acid is allowed to act on 9-ethyl-2-oxycarbazole in the presence of an alkali under pressure and at elevated temperature and the free Separates acid from its alkali salt. The new acid crystallizes from toluene or alcohol in colorless needles with a melting point of 229 and is a valuable intermediate product in the manufacture of dyes.
CH161224D 1931-01-12 1932-01-05 Process for the preparation of 9-ethyl-2-oxycarbazole-3-carboxylic acid. CH161224A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE161224X 1931-01-12
CH158826T 1932-01-05

Publications (1)

Publication Number Publication Date
CH161224A true CH161224A (en) 1933-04-15

Family

ID=25717149

Family Applications (1)

Application Number Title Priority Date Filing Date
CH161224D CH161224A (en) 1931-01-12 1932-01-05 Process for the preparation of 9-ethyl-2-oxycarbazole-3-carboxylic acid.

Country Status (1)

Country Link
CH (1) CH161224A (en)

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