CH177942A - Process for the production of an indigoid dye. - Google Patents
Process for the production of an indigoid dye.Info
- Publication number
- CH177942A CH177942A CH177942DA CH177942A CH 177942 A CH177942 A CH 177942A CH 177942D A CH177942D A CH 177942DA CH 177942 A CH177942 A CH 177942A
- Authority
- CH
- Switzerland
- Prior art keywords
- production
- dye
- indigoid dye
- blue
- dibromoisatin
- 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
- C09B7/00—Indigoid dyes
- C09B7/08—Other indole-indigos
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
Description
Verfahren zur Herstellung eines indigoiden Farbstoffes. Es wurde gefunden, dass man einen in- digoiden Farbstoff erhalten kann, wenn man die reaktionsfähigen a-Derivate des 5 . 7-Di- bromisatins mit 4-Methoxy-l-oxynaphthalin kondensiert.
Der Farbstoff der Formel
EMI0001.0009
stellt ein blaues kristallinisches Pulver dar, das sieh in konzentrierter Schwefelsäure mit grüner Farbe löst und beim Bedrucken der Baumwolle sehr echte blaue Töne von guter Naehtfarbe ergibt.
Beispiel: 30,5 Teile 5 . 7 - Dibromisatin werden durch Erwärmen mit 22 Teilen Phosphor- pentachlorid in 300 Teilen Chlorbenzol in das 5.7-Dibromisatin-a-chlorid verwandelt und mit einer bei 45 bis 50 hergestellten Lösung von 17,4 Teilen 4-Methoxy-l-oxy- naphthalin in 300 Teilen Chlorbenzol ver einigt. Der als blaues Kristallpulver erhal tene Farbstoff wird filtriert und mit Chlor benzol, sowie mit Alkohol gewaschen und ge trocknet.
Zu dem selben Farbstoff gelangt man, wenn statt in chlorbenzolischer Lösung in wässerigem Medium gearbeitet wird oder wenn an Stelle des 5 . 7-Dibromisatin-a-chlo- rids das 5 . 7-Dibromisatin-a-anilid in Essig säureanhydrid mit 4-Methoxy-l-oxynaphtha.- lin erhitzt wird.
Process for the production of an indigoid dye. It has been found that an indigo dye can be obtained if the reactive α-derivatives of the 5th 7-dibromisatin condensed with 4-methoxy-1-oxynaphthalene.
The dye of the formula
EMI0001.0009
is a blue crystalline powder that dissolves in concentrated sulfuric acid with a green color and when printed on the cotton gives very real blue tones of good sewing color.
Example: 30.5 parts 5. 7 - Dibromoisatin are converted into the 5.7-dibromoisatin a-chloride by heating with 22 parts of phosphorus pentachloride in 300 parts of chlorobenzene and with a solution of 17.4 parts of 4-methoxy-l-oxynaphthalene prepared at 45 to 50 in 300 parts of chlorobenzene united. The dye obtained as a blue crystal powder is filtered and washed with chlorobenzene and with alcohol and dried.
The same dye is obtained when working in an aqueous medium instead of in a chlorobenzene solution or when instead of the 5th 7-Dibromisatin-a-chlorides the 5th 7-dibromoisatin-a-anilide in acetic acid anhydride with 4-methoxy-l-oxynaphtha.- lin is heated.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH177942T | 1934-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH177942A true CH177942A (en) | 1935-06-30 |
Family
ID=4428141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH177942D CH177942A (en) | 1934-05-23 | 1934-05-23 | Process for the production of an indigoid dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH177942A (en) |
-
1934
- 1934-05-23 CH CH177942D patent/CH177942A/en unknown
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