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
Application number
Other languages
German (de)
Original Assignee
Hoechst Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoechst Ag filed Critical Hoechst Ag
Application granted granted Critical
Publication of AT46376B publication Critical patent/AT46376B/en

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  • 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)

PATENT-ANSPRUCH : Verfahren zur Darstellung von penta-und hexahalogenaubstituierten Indigofarbstonen, dadurch gekennzeichnet, dass man, statt überschüssiges Brom zu verwenden, wie in dem Stammpatent Nr. 45879 geschehen ist, hier die für die Penta-bezw. Hexabromindigo berechnete Menge Brom unter Benutzung einer hochkonzentrierten Schwefelsäure von nicht unter 96% bezw. unter Benutzung von Monohydrat oder schwach rauchender Säure anwendet. PATENT CLAIM: Process for the preparation of penta- and hexahalogenubstituted indigo dyes, characterized in that instead of using excess bromine, as was done in parent patent no. Hexabromindigo calculated amount of bromine using a highly concentrated sulfuric acid of not less than 96% respectively. using monohydrate or slightly fuming acid.
AT46376D 1908-06-12 1909-03-24 Process for the preparation of penta- and hexahalogenated indigo dyes. AT46376B (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4411790A1 (en) * 1994-04-06 1995-10-12 Braun Ag Electric iron

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4411790A1 (en) * 1994-04-06 1995-10-12 Braun Ag Electric iron

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