CH191238A - Process for the preparation of 3-oxycarbazole-2-carboxylic acid. - Google Patents
Process for the preparation of 3-oxycarbazole-2-carboxylic acid.Info
- Publication number
- CH191238A CH191238A CH191238DA CH191238A CH 191238 A CH191238 A CH 191238A CH 191238D A CH191238D A CH 191238DA CH 191238 A CH191238 A CH 191238A
- Authority
- CH
- Switzerland
- Prior art keywords
- oxycarbazole
- carboxylic acid
- preparation
- alkali
- acid
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 5
- 238000002360 preparation method Methods 0.000 title claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 150000001447 alkali salts Chemical class 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- FECNOIODIVNEKI-UHFFFAOYSA-N 2-[(2-aminobenzoyl)amino]benzoic acid Chemical class NC1=CC=CC=C1C(=O)NC1=CC=CC=C1C(O)=O FECNOIODIVNEKI-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von 3-Ogycarbazol-2-carbonsäure. Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Herstellung von 3-Oxy- carbazol-2-carbonsäure.
Es wurde gefunden, dass man zu der 3-Oxycarbazol-2-carbonsäure dadurch gelangt, dass man 3-Oxycarbazol, ein Alkali und Kohlensäure bei erhöhter Temperatur und erhöhtem Druck aufeinander einwirken lässt und aus dem Reaktionsprodukt die 3-Oxy- carbazol-2-carbonsäure abscheidet.
Man kann z. B. zunächst das 3-Oxycarbazol und ein Alkali zum Alkalisalz umsetzen, dieses mit Kohlensäure behandeln und dar nach die freie Säure mit Hilfe einer Säure abscheiden.
<I>Beispiel:</I> 183 Gewichtsteile 3-Oxycarbazol (s. Be richte 34, 1683) werden mit 40 Gewichts teilen Natriumhydroxyd in bekannter Weise in das Natriumsalz verwandelt. Das trockene Salz wird in einen Autoklaven eingefüllt, Kohlensäure aufgepresst und 10 Stunden auf 210-2201 C erhitzt.
Nach dem Erkalten wird der Autoklavinhalt in heissem Wasser gelöst, durch Einleiten von Kohlensäure Reste von nicht angegriffenem 3-Oxycarbazol gefällt und mit Mineralsäure die 3-Oxycarbazol-2- carbonsäure ausgefällt. Aus Alkohol kristal lisiert sie in kräftig gelb gefärbten dicken Kristallen vom F. P.<B>2870.</B> Die alkoholische Lösung färbt sich mit Eisenchloridlösung intensiv blau.
Die 3-Oxycarbazol-2-carbonsäure dient zur Herstellung von Farbstoffzwischenprodukten. Sie kristallisiert in kräftig gelb gefärbten dicken Kristallen vom F. P. 287 .
Process for the preparation of 3-ogycarbazole-2-carboxylic acid. The present invention relates to a process for the preparation of 3-oxycarbazole-2-carboxylic acid.
It has been found that the 3-oxycarbazole-2-carboxylic acid is obtained by allowing 3-oxycarbazole, an alkali and carbonic acid to act on one another at elevated temperature and pressure, and from the reaction product the 3-oxycarbazole-2- carboxylic acid separates.
You can z. B. first convert the 3-oxycarbazole and an alkali to the alkali salt, treat this with carbonic acid and then deposit the free acid with the help of an acid.
<I> Example: </I> 183 parts by weight of 3-oxycarbazole (see reports 34, 1683) are converted into the sodium salt with 40 parts by weight of sodium hydroxide in a known manner. The dry salt is poured into an autoclave, carbon dioxide is injected and heated to 210-2201 C for 10 hours.
After cooling, the contents of the autoclave are dissolved in hot water, residues of unaffected 3-oxycarbazole are precipitated by introducing carbon dioxide and the 3-oxycarbazole-2-carboxylic acid is precipitated with mineral acid. From alcohol it crystallizes in strong yellow colored thick crystals of the F. P. <B> 2870. </B> The alcoholic solution turns an intense blue with ferric chloride solution.
The 3-oxycarbazole-2-carboxylic acid is used to produce dye intermediates. It crystallizes in strong yellow colored thick crystals from F. P. 287.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE191238X | 1938-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH191238A true CH191238A (en) | 1937-06-15 |
Family
ID=5727792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH191238D CH191238A (en) | 1938-12-19 | 1936-03-18 | Process for the preparation of 3-oxycarbazole-2-carboxylic acid. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH191238A (en) |
-
1936
- 1936-03-18 CH CH191238D patent/CH191238A/en unknown
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