CH298038A - Process for the preparation of a new anthrapyridine. - Google Patents
Process for the preparation of a new anthrapyridine.Info
- Publication number
- CH298038A CH298038A CH298038DA CH298038A CH 298038 A CH298038 A CH 298038A CH 298038D A CH298038D A CH 298038DA CH 298038 A CH298038 A CH 298038A
- Authority
- CH
- Switzerland
- Prior art keywords
- new
- anthrapyridine
- preparation
- parts
- mol
- Prior art date
Links
Landscapes
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
Verfahren zur Herstellung eines .neuen Anthrapyridins. Degenstand des vorliegenden Patentes ist ein Verfahren zur Herstellung eines neuen Ant-lirapyridins, welches darin besteht,
dass man 1 lIol 1-Aniino-4-bromanthrachinon-2- sulfonsäure bei erhöhter Temperatur unter sauren Bedingungen mit 1 '11o1 Acetylessig- säureäthylester umsetzt. Das neue Anthrapyridin soll als Zwischen produkt zur Herstellung von Farbstoffen Verwendung finden.
Im nachfolgenden Beispiel bedeuten die Teile Gewichtsteile.
.Beispiel: 19 Teile 1-Amino - 4 - bromantlirachinon-2- sulfonsäure und 100 Teile Aeetylessigsäure- ä.thylester werden unter Rühren auf 125 er liitzt. Leichtflüchtige Reaktionsprodukte wer den durch einen schwachen Luftstrom aus dem Reaktionsgefäss verdrängt. Die Tempera tur der Masse wird so lange bei 125 gehal ten, bis eine in reine Schwefelsäure gezo gene Probe auf Zusatz von Paraformalde- hyd nicht mehr nach blau umschlägt. Hier auf versetzt man die Masse bei 7'5 mit<B>150</B> Tei len Benzol, lässt sie erkalten und saugt den entstandenen Niederschlag ab.
Man wäscht ihn mit Benzol und trocknet ihn. Er wird in 500 Teilen Wasser unter Rühren aufgenom men, die Aufschlämmung mit 3 'Teilen Na- triumcarbonat und 10 'Teilen Entfärbungs- kohle versetzt und die nunmehr entstandene Lösung zum Sieden erhitzt.. Man filtriert die Lösung und versetzt das Filtrat mit. 120 Tei len Natriumchlorid. Der ausgefallene Nieder schlag wird heiss abgesaugt, mit 500 Teilen 15o/oiger Nat-riumehloridlösung gewaschen und getrocknet. Man erhält ein gelb bis rötlich gefärbtes Pulver, das sich in Wasser mit blass oranger Farbe löst..
Die Lösung in reiner Schwefelsäure ist zitronengelb.
Process for the production of a new anthrapyridine. The subject of the present patent is a process for the production of a new ant-lirapyridine, which consists in
that 1 lol of 1-aniino-4-bromoanthraquinone-2-sulfonic acid is reacted at elevated temperature under acidic conditions with 1 '11o1 ethyl acetylacetate. The new anthrapyridine is to be used as an intermediate in the manufacture of dyes.
In the following example, the parts are parts by weight.
Example: 19 parts of 1-amino-4-bromantlirachinone-2-sulfonic acid and 100 parts of ethyl acetate are heated to 125 with stirring. Highly volatile reaction products are displaced from the reaction vessel by a weak stream of air. The temperature of the mass is kept at 125 until a sample drawn in pure sulfuric acid no longer turns blue due to the addition of paraformaldehyde. Here on the mass is mixed with <B> 150 </B> parts of benzene at 7'5, allowed to cool and the precipitate formed is suctioned off.
You wash it with benzene and dry it. It is taken up in 500 parts of water with stirring, 3 parts of sodium carbonate and 10 parts of decolorizing charcoal are added to the slurry and the resulting solution is heated to boiling. The solution is filtered and the filtrate is added. 120 parts of sodium chloride. The precipitate which has separated out is filtered off with suction while hot, washed with 500 parts of 15% sodium chloride solution and dried. A yellow to reddish colored powder is obtained which dissolves in water with a pale orange color.
The solution in pure sulfuric acid is lemon yellow.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH298038T | 1951-07-12 | ||
CH295054T | 1951-07-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH298038A true CH298038A (en) | 1954-04-15 |
Family
ID=25733562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH298038D CH298038A (en) | 1951-07-12 | 1951-07-12 | Process for the preparation of a new anthrapyridine. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH298038A (en) |
-
1951
- 1951-07-12 CH CH298038D patent/CH298038A/en unknown
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