CH131271A - Process for the preparation of a derivative of a vat dye. - Google Patents
Process for the preparation of a derivative of a vat dye.Info
- Publication number
- CH131271A CH131271A CH131271DA CH131271A CH 131271 A CH131271 A CH 131271A CH 131271D A CH131271D A CH 131271DA CH 131271 A CH131271 A CH 131271A
- Authority
- CH
- Switzerland
- Prior art keywords
- derivative
- vat dye
- dichloro
- preparation
- dimethylthioindigo
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Indole Compounds (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
Description
<B>Zusatzpatent</B> zum Hauptpatent Nr. 129589. Verfahren zur Herstellung eines Derivates eines Küpenfarbstoffes. Es wurde gefunden, dass man ein Derivat eines Küpenfarbstoffes erhält, wenn man die Leukoverbindung des 5,5'-Diehlor-7,7'-diine- thylthioindigos mit einer Monohalogenessig- säure behandelt.
Die neue Verbindung bildet ein rotbraunes Pulver; sie ist in Alkohol sehr schwer löslich, in Äther, Benzol, Chloroform, Wasser und verdünnten Säuren unlöslich, dagegen sehr leicht löslich in kalter, verdünnter Lauge mit rotbrauner Farbe. Durch Erwärmen in saurem oder alkalischem Medium. in Gegenwart von Oxydationsmitteln, wie Eisenchlorid oder Ferrioyankalium, lässt sich das Produkt zum 5,5'-Dichlor-7,7'-dimethylthioindigo zurück verwandeln.
Beispiel Zu einer Lösung von 300 Teilen Leuko- 5,5'-Dichlor-7,7'- dimethyltbioindigo in 400 Teilen Natriumhydroxyd und 3000 Teilen Wasser werden 220 Teile Chloressigsäure, gelöst in 1100 Teilen Wasser unter Zusatz von 140 Teilen Soda, zugegeben und das Gemisch während einer Stunde auf 75-80 erwärmt.
Hierauf wird von- =wenig unver ändertem Leuko-5,5'-Dichlor-7,7'-dimethyl- tbioindigo abfiltriert und das Filtrat mit 800 Teilen konzentrierter Salzsäure angesäuert, wobei das Kondensationsprodukt in Form eines rotbraunen Pulvers sich ;abscheidet, welches filtriert, mit Wasser 'ausgewaschen, getrocknet und gemahlen wird.
<B> Additional patent </B> to main patent no. 129589. Process for the preparation of a derivative of a vat dye. It has been found that a derivative of a vat dye is obtained if the leuco compound of 5,5'-diehlor-7,7'-diineethylthioindigo is treated with a monohaloacetic acid.
The new compound forms a red-brown powder; it is very sparingly soluble in alcohol, insoluble in ether, benzene, chloroform, water and dilute acids, but very easily soluble in cold, dilute lye with a reddish-brown color. By heating in an acidic or alkaline medium. in the presence of oxidizing agents such as ferric chloride or potassium ferric oxide, the product can be converted back to 5,5'-dichloro-7,7'-dimethylthioindigo.
EXAMPLE To a solution of 300 parts of leuco-5,5'-dichloro-7,7'-dimethyltbioindigo in 400 parts of sodium hydroxide and 3000 parts of water, 220 parts of chloroacetic acid, dissolved in 1100 parts of water with the addition of 140 parts of soda, are added and that Mixture heated to 75-80 for one hour.
Thereupon, leuco-5,5'-dichloro-7,7'-dimethyl-tbioindigo is filtered off and the filtrate is acidified with 800 parts of concentrated hydrochloric acid, the condensation product separating out in the form of a red-brown powder, which is filtered is washed 'with water', dried and ground.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH131271T | 1927-06-08 | ||
CH129589T CH129589A (en) | 1927-06-08 | 1927-06-08 | Process for the preparation of a derivative of a vat dye. |
Publications (1)
Publication Number | Publication Date |
---|---|
CH131271A true CH131271A (en) | 1929-01-31 |
Family
ID=25711285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH131271D CH131271A (en) | 1927-06-08 | 1927-06-08 | Process for the preparation of a derivative of a vat dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH131271A (en) |
-
1927
- 1927-06-08 CH CH131271D patent/CH131271A/en unknown
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