DE615579C - Process for the preparation of the 2, 8-Dioxycarbazol-3, 6-disulfonic acid or the 2, 8-Dioxycarbazole - Google Patents
Process for the preparation of the 2, 8-Dioxycarbazol-3, 6-disulfonic acid or the 2, 8-DioxycarbazoleInfo
- Publication number
- DE615579C DE615579C DEI44348D DEI0044348D DE615579C DE 615579 C DE615579 C DE 615579C DE I44348 D DEI44348 D DE I44348D DE I0044348 D DEI0044348 D DE I0044348D DE 615579 C DE615579 C DE 615579C
- Authority
- DE
- Germany
- Prior art keywords
- dioxycarbazole
- preparation
- acid
- disulfonic acid
- dioxycarbazol
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Landscapes
- Indole Compounds (AREA)
Description
Verfahren zur Darstellung der 2, 8-Dioxycarbazol-3, 6-disulfonsäure bzw. des 2, 8-Dioxycarbazols Durch das Patent 603 945 ist ein Verfahren zur Herstellung der Carbazol-2, 3, 6, 8-tetrasulfonsäure unter Schutz gestellt. Es besteht darin, daß man Carbazol in Gegenwart -das gesamte Reaktionswasser chemisch bindender Mittel sulfoniert.Process for the preparation of 2, 8-Dioxycarbazol-3, 6-disulfonic acid or of 2, 8-Dioxycarbazols By Patent 603,945 discloses a process for preparation of the carbazole-2, 3, 6, 8-tetrasulfonic placed under protection. It consists in sulfonating carbazole in the presence of the entire water of reaction of chemically binding agents.
Es wurde nun gefunden, daß die bisher unbekannte 2, 8-Dioxycaxbaz01-3, 6-disulfonsäure erhalten wird, wenn die nach dem Verfahren des obengenannten Patents erhältliche Carbazoltetrasulfonsäure bei Temperaturen über 2oo° mit Ätzalkalien verschmolzen wird.It has now been found that the previously unknown 2, 8-Dioxycaxbaz01-3, 6-disulfonic acid is obtained when by the method of the above-mentioned patent available carbazole tetrasulfonic acid at temperatures above 2oo ° with caustic alkalis is merged.
Durch Abspaltung der Sulfonsäuregruppen nach an sich bekannten Methoden wird hieraus das bisher in der Literatur noch unbekannte 2, 8-Dioxycaxbazol vom F. 246 bis 247° erhalten.By splitting off the sulfonic acid groups by methods known per se from this, the 2, 8-Dioxycaxbazol vom F. 246 to 247 ° obtained.
Die so erhältliche 2, 8-Dioxycarbazol-3, 6-disulfonsäune und das :entsprechende 2, 8-Dioxycarbazol sind wertvolle Zwischenprodukte bei der Herstellung von Farbstoffen. Beispiel In 200 Gewichtsteile Ätzkali und 4o Gewichtsteile Wasser werden bei ioo bis 13o° i oo Gewichtsteile der nach dem Verfahren des Patents 603 9,15 erhältlichen Carbazol-2, 3, 6, 8-tetrasulfonsäure eingetragen undetwa 1z/2 bis 2 Stunden bei 23o bis 24o° verschmolzen. Dann wird die gelb gefärbte Schmelze mit etwa 5oo Gewichtsteilen Wasser aufgenommen, von Spuren Verunreinigung abgesaugt und mit 45o Gewichtsteilen roher Salsäure kongosauer gestellt. Nach Verjagen der schwefligen Säure scheidet sich bei läng erem Stehen in der Kälte die neue 2, 8-Dioxycarbazol-3, 6-disulfonsäure kristallin ab.The 2,8-dioxycarbazole-3, 6-disulfonic acid obtainable in this way and the corresponding 2,8-dioxycarbazole are valuable intermediates in the production of dyes. EXAMPLE 9.15 are added to 200 parts by weight of caustic potash and 40 parts by weight of water at 100 to 130 parts by weight of the carbazole-2, 3, 6, 8-tetrasulfonic acid obtainable by the process of patent 603 and about 1/2 to 2 hours at 23 ° fused to 24o °. The yellow-colored melt is then taken up with about 500 parts by weight of water, traces of impurities are suctioned off and acidified to the Congo with 45o parts by weight of raw salsic acid. After the sulphurous acid has been chased away, the new 2, 8-dioxycarbazole-3, 6-disulphonic acid separates out in crystalline form on prolonged standing in the cold.
Wird diese Säure mit verdünnten Mineralsäuren nach bekannten Methodenunter Druck erhitzt, so wird das bisher unbekannte z, 8-Dioxycarbazol erhalten, das aus Xylol oder Dichlorbenzol in farblosen Nadeln vom F. 246 bis 247° kristallisiert.If this acid is treated with dilute mineral acids according to known methods Heated pressure, the hitherto unknown z, 8-dioxycarbazole is obtained from Xylene or dichlorobenzene crystallizes in colorless needles from a temperature of 246 to 247 °.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI44348D DE615579C (en) | 1932-05-03 | 1932-05-03 | Process for the preparation of the 2, 8-Dioxycarbazol-3, 6-disulfonic acid or the 2, 8-Dioxycarbazole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI44348D DE615579C (en) | 1932-05-03 | 1932-05-03 | Process for the preparation of the 2, 8-Dioxycarbazol-3, 6-disulfonic acid or the 2, 8-Dioxycarbazole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE615579C true DE615579C (en) | 1935-07-08 |
Family
ID=7191263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEI44348D Expired DE615579C (en) | 1932-05-03 | 1932-05-03 | Process for the preparation of the 2, 8-Dioxycarbazol-3, 6-disulfonic acid or the 2, 8-Dioxycarbazole |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE615579C (en) |
-
1932
- 1932-05-03 DE DEI44348D patent/DE615579C/en not_active Expired
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