AT46376B - Process for the preparation of penta- and hexahalogenated indigo dyes. - Google Patents
Process for the preparation of penta- and hexahalogenated indigo dyes.Info
- Publication number
- AT46376B AT46376B AT46376DA AT46376B AT 46376 B AT46376 B AT 46376B AT 46376D A AT46376D A AT 46376DA AT 46376 B AT46376 B AT 46376B
- Authority
- AT
- Austria
- Prior art keywords
- penta
- preparation
- hexahalogenated
- indigo dyes
- bromine
- Prior art date
Links
Landscapes
- Indole Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
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B o i 8 piel III. 42 Teile Dibromindigo werden in ein stark gekühltes Gemisch von 420 Teilen rauchender Schwefelsäure von etwa 2-5% Anhydridgehalt und 48-50 Teilen Brom langsam eingetragen. Man rührt kurze Zeit unter weiterer Kühlung, dann ohne Kühlung und erwärmt mehrere Stunden auf 45--52".
Die Aufarbeitung ist dieselbe wie im Beispiel I.
Um zu einem hexabromierten Indigo zu gelangen, arbeitet man unter entsprechender Erhöhung der Brommenge und der Reaktionsdauer nach den angegebenen Beispielen.
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B o i 8 piel III. 42 parts of dibromoindigo are slowly introduced into a strongly cooled mixture of 420 parts of fuming sulfuric acid with an anhydride content of about 2-5% and 48-50 parts of bromine. The mixture is stirred for a short time with further cooling, then without cooling and heated to 45-52 "for several hours.
The work-up is the same as in Example I.
In order to obtain a hexabrominated indigo, one works with a corresponding increase in the amount of bromine and the reaction time according to the examples given.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE45879X | 1908-06-12 | ||
DE46376X | 1909-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT46376B true AT46376B (en) | 1911-02-10 |
Family
ID=25749025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT46376D AT46376B (en) | 1908-06-12 | 1909-03-24 | Process for the preparation of penta- and hexahalogenated indigo dyes. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT46376B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4411790A1 (en) * | 1994-04-06 | 1995-10-12 | Braun Ag | Electric iron |
-
1909
- 1909-03-24 AT AT46376D patent/AT46376B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4411790A1 (en) * | 1994-04-06 | 1995-10-12 | Braun Ag | Electric iron |
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