CH279526A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH279526A CH279526A CH279526DA CH279526A CH 279526 A CH279526 A CH 279526A CH 279526D A CH279526D A CH 279526DA CH 279526 A CH279526 A CH 279526A
- Authority
- CH
- Switzerland
- Prior art keywords
- sulfuric acid
- azo dye
- yellow
- preparation
- acid ester
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/32—Monoazo dyes prepared by diazotising and coupling from coupling components containing a reactive methylene group
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung eines Azofarbatoffes. Es wurde gefunden, dass man zu einem wertvollen Azofarbstöff gelangt, wenn man den Leiikoschwefelsäureester der Verbindung der Formel
EMI0001.0005
mit dianotiertem 1-Amino-2-methoxybenzol ver einigt..
Der neue Farbstoff bildet ein gelbes Pul <I>ver,</I> das sich in Wasser leicht mit orangegelber Farbe löst und ergibt, auf Baumwolle ge druckt und mit Natriumnitrit und verdünnter Schwefelsäure entwickelt, reine kräftig gelbe Töne von ausgezeichneten Echtheitseigen schaften.
Der beim vorliegenden Verfahren als Aus gangsstoff dienende Leukoschwefelsäureester kann beispielsweise aus dem Leukoschwefel- säureester des 3-Brom-2-aminoanthrachinons durch Umsetzung mit Diketen erhalten wer den. Die Kupplung mit dem dianotierten 1 Amino-2-methoxybenzol kann in üblicher Weise, z. B. in schwach alkalischem, Natrium carbonat enthaltendem Medium bei Tempera turen zwischen 0 und etwa 25 durchgeführt werden.
Beispiel: 12,3 Teile 1-Atnino-2-methoxybenzol wer den in üblicher Weise dianotiert und die klare Diazolösung bei 5 bis 8 zu einer Lösung von 58,1 Teilen Dinatriumsalz des Leukoschwefel- Säureesters des 3 -Brom- 2 - acetoacetylamino- anthrachinons und 30 Teilen Natriiuncarbonat in 500 Teilen Wasser fliessengelassen. Aus der gelben Kupplungslösung scheidet sich der Farbstoff nach einiger Zeit in Form eines gelben
kristallinen Niederschlages ab. Man rührt 2 Stunden bei 5 bis 8 und dann 6 Stun den bei 10 bis 15 . Dann erwärmt man lang sam auf 40 bis 50 , setzt 50 Teile Natrium chlorid hinzu und rührt bis zur vollständigen Abscheidung des Farbstoffes bei Raumtem peratur. Dann filtriert man den Niederschlag, wäscht ihn mit verdünnter Natriumchlorid- lösung nach und trocknet im Vakuum bei 50 bis 60 .
Process for the production of an azo carbate. It has been found that a valuable azo dye is obtained if the leikosulfuric acid ester of the compound of the formula
EMI0001.0005
combined with dianotated 1-amino-2-methoxybenzene.
The new dye forms a yellow powder that dissolves easily in water with an orange-yellow color and, when printed on cotton and developed with sodium nitrite and dilute sulfuric acid, produces pure, strong yellow shades with excellent fastness properties.
The leuco-sulfuric acid ester used as starting material in the present process can be obtained, for example, from the leuco-sulfuric acid ester of 3-bromo-2-aminoanthraquinone by reaction with diketene. The coupling with the dianotated 1-amino-2-methoxybenzene can be carried out in a conventional manner, for. B. in a weakly alkaline medium containing sodium carbonate at temperatures between 0 and about 25.
Example: 12.3 parts of 1-atnino-2-methoxybenzene who dianotized in the usual way and the clear diazo solution at 5 to 8 to a solution of 58.1 parts of the disodium salt of the leuco-sulfuric acid ester of 3-bromo-2-acetoacetylamino anthraquinone and 30 parts of sodium carbonate in 500 parts of water. After a while, the dye separates from the yellow coupling solution in the form of a yellow one
crystalline precipitate. The mixture is stirred for 2 hours at 5 to 8 and then for 6 hours at 10 to 15. The mixture is then heated slowly to 40 to 50, 50 parts of sodium chloride are added and the mixture is stirred at room temperature until the dye has separated out completely. The precipitate is then filtered off, washed with dilute sodium chloride solution and dried in vacuo at 50 to 60.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH275436T | 1950-01-18 | ||
CH279526T | 1950-01-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH279526A true CH279526A (en) | 1951-11-30 |
Family
ID=25731615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH279526D CH279526A (en) | 1950-01-18 | 1950-01-18 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH279526A (en) |
-
1950
- 1950-01-18 CH CH279526D patent/CH279526A/en unknown
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