CH195840A - Process for the preparation of 9-methyl-3-oxycarbazole-2-carboxylic acid. - Google Patents
Process for the preparation of 9-methyl-3-oxycarbazole-2-carboxylic acid.Info
- Publication number
- CH195840A CH195840A CH195840DA CH195840A CH 195840 A CH195840 A CH 195840A CH 195840D A CH195840D A CH 195840DA CH 195840 A CH195840 A CH 195840A
- Authority
- CH
- Switzerland
- Prior art keywords
- sep
- oxycarbazole
- carboxylic acid
- methyl
- acid
- Prior art date
Links
Landscapes
- Indole Compounds (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von 9-Nethyl-3-ogyearbazol-2-earbonsäure. Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Herstellung von 9-Methyl-3-oxycarbazol-2-carbonsäure.
Es wurde gefunden, dass man zu der bis her noch nicht bekannten 9-Methyl-3-oxy- carbazol-2-carbonsäure gelangt, wenn man 9-2Zethyl-3-oxycarbazol, ein Alkali und Kohlensäure bei erhöhter Temperatur und er höhtem Druck aufeinander einwirken lässt und aug dem Reaktionsprodukt die 9-Methyl- 3-oxycarbazol-2-carbonsäure mit Hilfe einer Säure abscheidet.
Man kann zum Beispiel zunächst das 9-Me- thyl-3-oxycarbazol und ein Alkali zum Al kalisalz umsetzen, dieses mit Kohlensäure behandeln und danach .die Säure abscheiden. <I>Beispiel:</I> <B>150</B> Gewichtsteile 9-Methyl-3-oxyearba- zol werden mit 31 Gewicht-steilen Natrium hydroxyd in bekannter Weise in das Na triumsalz verwandelt. Das trockene Salz wird in einen Autoklaven eingefüllt, Kohlen säure aufgepresst und 1,0, .Stunden auf 210 bis- 220 C erhitzt.
Nach dem Erkalten wird der Auteklaveninhalt in heissem Wasser ge löst. Durch Einleiten von Kohlensäure wer den Reste von nicht angegriffenem 9-Methyl- 3-oxycarbazol gefällt, und darauf wird mit. Mineralsäure die 9-Methyl-3-oxycarbazol-2- carbonsäure ausgefällt. Aus9 Alkohol kristal lisiert sie in kräftig gelb gefärbten dicken Kristallen vom F. P. 240 . Die alkoholische Lösung färbt sich mit Eisenchloridlösung intensiv blau.
Die 9-Methyl-3-oxycarbazol-2-carbonsäure dient zur Herstellung von FarbstoffzwiscIien- produkten.
Das 9-Methyl-3-oxycarbazol wird auf f olgendem Wege erhalten: 3-Methoxycarbazol (Annalen 3-59, 79) wird weitermethyliert zum 9-Methyl-3-methoxycarbazol (farblose Nadeln aus Alkohol, F. P. 98 ) und dieses beispielsweise nach dem Verfahren der deut-
EMI0002.0001
sehen <SEP> Patentschrift <SEP> NTr. <SEP> 553409 <SEP> partiell <SEP> zum
<tb> 9-bZethy <SEP> 1-3-oxy <SEP> earbazol <SEP> (farblose <SEP> Nadeln <SEP> aus
<tb> Toluol, <SEP> F. <SEP> P. <SEP> 145 <SEP> ) <SEP> entmethyliert.
Process for the preparation of 9-ethyl-3-ogyearbazol-2-carboxylic acid. The present invention relates to a process for the preparation of 9-methyl-3-oxycarbazole-2-carboxylic acid.
It has been found that the hitherto unknown 9-methyl-3-oxycarbazole-2-carboxylic acid is obtained if 9-2Zethyl-3-oxycarbazole, an alkali and carbonic acid are added to one another at elevated temperature and pressure lets act and the 9-methyl-3-oxycarbazole-2-carboxylic acid separates out of the reaction product with the help of an acid.
For example, you can first convert the 9-methyl-3-oxycarbazole and an alkali to the alkali salt, treat this with carbonic acid and then separate the acid. <I> Example: </I> <B> 150 </B> parts by weight of 9-methyl-3-oxyearba- zole are converted into the sodium salt in a known manner with 31 parts by weight of sodium hydroxide. The dry salt is poured into an autoclave, carbonic acid is injected and heated to 210 to 220 C for 1.0 hours.
After cooling, the contents of the autoclave are dissolved in hot water. By introducing carbonic acid who the remains of unaffected 9-methyl-3-oxycarbazole precipitated, and then with. Mineral acid, the 9-methyl-3-oxycarbazole-2-carboxylic acid precipitated. It crystallizes from alcohol in strong yellow colored thick crystals of F. P. 240. The alcoholic solution turns an intense blue with ferric chloride solution.
The 9-methyl-3-oxycarbazole-2-carboxylic acid is used to produce intermediate dye products.
The 9-methyl-3-oxycarbazole is obtained in the following way: 3-methoxycarbazole (Annalen 3-59, 79) is further methylated to 9-methyl-3-methoxycarbazole (colorless needles from alcohol, FP 98) and this, for example, after Procedure of the German
EMI0002.0001
see <SEP> patent specification <SEP> NTr. <SEP> 553409 <SEP> partially <SEP> for
<tb> 9-bZethy <SEP> 1-3-oxy <SEP> earbazol <SEP> (colorless <SEP> needles <SEP> from
<tb> Toluene, <SEP> F. <SEP> P. <SEP> 145 <SEP>) <SEP> demethylated.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE195840X | 1935-03-20 | ||
CH191238T | 1936-03-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH195840A true CH195840A (en) | 1938-02-15 |
Family
ID=25722094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH195840D CH195840A (en) | 1935-03-20 | 1936-03-18 | Process for the preparation of 9-methyl-3-oxycarbazole-2-carboxylic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH195840A (en) |
-
1936
- 1936-03-18 CH CH195840D patent/CH195840A/en unknown
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