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.Info
- 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
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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)
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) |
-
1932
- 1932-01-05 CH CH161224D patent/CH161224A/en unknown
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