CH208536A - Process for the preparation of an azo dye derivative. - Google Patents
Process for the preparation of an azo dye derivative.Info
- Publication number
- CH208536A CH208536A CH208536DA CH208536A CH 208536 A CH208536 A CH 208536A CH 208536D A CH208536D A CH 208536DA CH 208536 A CH208536 A CH 208536A
- Authority
- CH
- Switzerland
- Prior art keywords
- azo dye
- preparation
- dye
- methylbenzene
- phosphoric acid
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung eines Azofarbstoffderivates. Es wurde gefunden, dass man ein neues Derivat eines Azofarbstoffes erhält, wenn man auf den Azofarbstoff, der erhalten wird durch Vereinigen von 1-Diazo-2-methoxy-5- methylbenzol mit 1-Ogy-4-methylbenzol, in Gegenwart einer tertiären Base Phosphor ogychlorideinwirken lässt und das erhältliche Reaktionsprodukt, das auf 1 Mol des Azo- farbstoffes 1 Mol des Phosphorsäurerestes enthält,
einer wässerigen Verseifung unter wirft.
Das neue Produkt stellt einen Phosphor säureester des Ausgangsfarbstoffes dar, löst sich in Wasser mit gelber Farbe auf und regeneriert durch Behandlung mit verdünn ten Säuren den Ausgangsfarbstoff.
Beispiel: 2,5 Teile des Azofarbstoffes aus diazotier- tem 1-Amino-2-methoxy-5-methylbenzol und p-Kresol werden in 25 Teilen Pyridin suspen diert und unter Eiskühlung 6 Teile Phos- phoroxychlorid langsam zutropfen gelassen.
Hierauf wird das Reaktionsgemisch allmäh lich auf 40-50' erhitzt, wobei der Azofarb- stoff in Lösung geht und nach 2 Stunden Reaktionsdauer eine Probe in Wasser klar löslich geworden ist.
Das Reaktionsgemisch wird nun in eine Lösung von 20 Teilen Na- triumcarbonat in 160 Teilen Wasser eingetra gen, das Pyridin mit Wasserdampf abdestil- liert, die Lösung des Destillationsrückstandes filtriert, das Reaktionsprodukt mit Natrium chlorid und Kaliumchlorid ausgesalzen, ab gesaugt und im Vakuum getrocknet.
Process for the preparation of an azo dye derivative. It has been found that a new derivative of an azo dye is obtained by reacting to the azo dye obtained by combining 1-diazo-2-methoxy-5-methylbenzene with 1-ogy-4-methylbenzene in the presence of a tertiary base Lets phosphorus ogychloride act and the obtainable reaction product, which contains 1 mol of the phosphoric acid residue for 1 mol of the azo dye,
subjected to an aqueous saponification.
The new product is a phosphoric acid ester of the starting dye, dissolves in water with a yellow color and regenerates the starting dye by treatment with dilute acids.
Example: 2.5 parts of the azo dye from diazotized 1-amino-2-methoxy-5-methylbenzene and p-cresol are suspended in 25 parts of pyridine and 6 parts of phosphorus oxychloride are slowly added dropwise with ice-cooling.
The reaction mixture is then gradually heated to 40-50 °, the azo dye dissolving and, after a reaction time of 2 hours, a sample has become clearly soluble in water.
The reaction mixture is then introduced into a solution of 20 parts of sodium carbonate in 160 parts of water, the pyridine is distilled off with steam, the solution of the distillation residue is filtered, the reaction product is salted out with sodium chloride and potassium chloride, filtered off with suction and dried in vacuo.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH208536D CH208536A (en) | 1938-04-13 | 1938-04-13 | Process for the preparation of an azo dye derivative. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH208536T | 1938-04-13 | ||
CH208536D CH208536A (en) | 1938-04-13 | 1938-04-13 | Process for the preparation of an azo dye derivative. |
Publications (1)
Publication Number | Publication Date |
---|---|
CH208536A true CH208536A (en) | 1940-02-15 |
Family
ID=25724524
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH208536D CH208536A (en) | 1938-04-13 | 1938-04-13 | Process for the preparation of an azo dye derivative. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH208536A (en) |
-
1938
- 1938-04-13 CH CH208536D patent/CH208536A/en unknown
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