CH157943A - Process for the preparation of 2-oxycarbazole-7-sulfonic acid. - Google Patents
Process for the preparation of 2-oxycarbazole-7-sulfonic acid.Info
- Publication number
- CH157943A CH157943A CH157943DA CH157943A CH 157943 A CH157943 A CH 157943A CH 157943D A CH157943D A CH 157943DA CH 157943 A CH157943 A CH 157943A
- Authority
- CH
- Switzerland
- Prior art keywords
- oxycarbazole
- sulfonic acid
- water
- acid
- preparation
- Prior art date
Links
Landscapes
- Indole Compounds (AREA)
Description
Verfahren zur Darstellung von 2-Ogygarbazol-7-sulfosäure. Es wurde gefunden, dass man die bisher umbekannte 2-Oxycarbazol-7-sulfosäure in guter Ausbeute dadurch erhalten kann, dass man Carbazol-2.7-disulfosäure der Einwir kung eines bis 100' % Alkali enthaltenden Agens unterwirft, zweckmässig bei Tempera turen zwischen 2"60-2,80'C.
Das Verfahren kann auch unter Zusatz von Wasser unter Druck ausgeführt wer den. Die neue Oxysulfosäure soll zur Her stellung von Zwischenprodukten und Farb stoffen dienen.
<I>Beispiel 1:</I> 371 Gewichtsteile carbazol-2.7-disulfo- saures Natrium, erhältlich gemäss dem Ver fahren des Schweiz. Patentes Nr. 154816, werden bei 265-27b.' in eine Mischung von 9.00 Gewichtsteilen Ätzkali und 400 Ge wichtsteilen Ätznatron unter gutem Rühren langsam eingetragen. Nach dreistündigem Schmelzen bei dieser Temperatur verdünnt man mit 3500 Teilen Wasser und lässt 1600 Gewichtsteils Salzsäure 19'13A zulaufen.
Beim Abkühlen kristallisiert das Dikaliumsalz der 2-Oxycarbazol-7-sulfosäure in einer Ausbeute von etwa 80ö der Theorie. Es löst sich leicht in Wasser mit blauer Fluoreszenz und alkalischer Reaktion. Beim Versetzen mit Mineralsäuren bildet sich das Monokalium salz, das in Wasser schwer löslich ist. Aus dem Alkalisalz wird in bekannter Weise über das Bariumsalz die freie Säure gewonnen.
Beim Erhitzen der 2-Oxycarbazol-7-sulfo- säure mit verdünnten Mineralsäuren unter Druck entsteht in fast quantitativer Aus beute 2-Oxycarbazol.
<I>Beispiel 2:</I> 371 Gewichtsteile carbazol-2.7-disalfo- saures Natron werden mit 1200 Gewichts teilen Ätzkali und 300 Gewichtsteilen Was ser in einem Druckautoklaven 10 Stunden auf 270-290 erhitzt. Die Schmelze wird aufgearbeitet wie im Beispiel 1 angegeben.
Process for the preparation of 2-ogygarbazole-7-sulfonic acid. It has been found that the previously unknown 2-oxycarbazole-7-sulfonic acid can be obtained in good yield by subjecting carbazole-2,7-disulfonic acid to the action of an agent containing up to 100% alkali, expediently at temperatures between 2 " 60-2.80'C.
The process can also be carried out with the addition of water under pressure. The new oxysulfonic acid is to be used for the manufacture of intermediates and dyes.
<I> Example 1 </I> 371 parts by weight of carbazole-2.7-disulphonic acid sodium, obtainable according to the method of Switzerland. Patent No. 154816, are at 265-27b. ' slowly entered into a mixture of 9.00 parts by weight of caustic potash and 400 parts by weight of caustic soda with thorough stirring. After three hours of melting at this temperature, it is diluted with 3500 parts of water and 1600 parts by weight of hydrochloric acid 19'13A are run in.
On cooling, the dipotassium salt of 2-oxycarbazole-7-sulfonic acid crystallizes in a yield of about 80 ° of theory. It easily dissolves in water with blue fluorescence and alkaline reaction. When mixed with mineral acids, the monopotassium salt is formed, which is sparingly soluble in water. The free acid is obtained from the alkali salt in a known manner via the barium salt.
When the 2-oxycarbazole-7-sulphonic acid is heated with dilute mineral acids under pressure, 2-oxycarbazole is produced in almost quantitative yield.
<I> Example 2: </I> 371 parts by weight of carbazole-2.7-disalfosate sodium are heated with 1200 parts by weight of caustic potash and 300 parts by weight of water in a pressure autoclave to 270-290 hours for 10 hours. The melt is worked up as indicated in Example 1.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE157943X | 1930-12-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH157943A true CH157943A (en) | 1932-10-31 |
Family
ID=5679160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH157943D CH157943A (en) | 1930-12-04 | 1931-12-03 | Process for the preparation of 2-oxycarbazole-7-sulfonic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH157943A (en) |
-
1931
- 1931-12-03 CH CH157943D patent/CH157943A/en unknown
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