AT35222B - Process for the preparation of tetramethylthioindigo. - Google Patents

Process for the preparation of tetramethylthioindigo.

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Publication number
AT35222B
AT35222B AT35222DA AT35222B AT 35222 B AT35222 B AT 35222B AT 35222D A AT35222D A AT 35222DA AT 35222 B AT35222 B AT 35222B
Authority
AT
Austria
Prior art keywords
heated
tetramethylthioindigo
preparation
dimethyloxythionaphthene
sulfur
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 AT35222B publication Critical patent/AT35222B/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

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 lauge bis zur bleibenden alkalischen Reaktion versetzt. Durch Zusatz von Ferricyankalium wird das in der Lösung befindliche Dimethyloxythionaphten oxydiert und der Farbstoff abgeschieden. 



   Anstelle des Ferricyankaliums können andere Oxydationsmittel, z. B. Eisenchlorid, Chlorschwefel, Luft in Abwesenheit von freiem Alkali oder Luft in ammoniakalischer Lösung unter Zusatz von Kupfersulfat verwendet werden. 



     Beispiel III : l   Teil Dimethylphenylthioglykol-o-karbonsäure wird mit der 5fachen Menge Nitrobenzol mehrere Stunden zum Kochen erhitzt. Die Lösung färbt sich rot und beim Erkalten krystallisiert der Farbstoff aus. 



     Beispiel IV   : Ein inniges Gemisch von 1 Teil   Dimethylphenylthioglykol-o-karbon-   säure   und-t   Teilen Schwefel wird 8 Stunden auf 200-2500 erhitzt. Die erkaltete und gepulverte Masse wird sodann mit Schwefelkohlenstoff extrahiert und der zurückbleibende Farbstoff in 
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 lye added until the alkaline reaction remains. By adding potassium ferricyanide, the dimethyloxythionaphthene in the solution is oxidized and the dye is deposited.



   Instead of potassium ferricyanide, other oxidizing agents, e.g. B. iron chloride, chlorosulfur, air in the absence of free alkali or air in ammoniacal solution with the addition of copper sulfate.



     Example III: 1 part of dimethylphenylthioglycol-o-carboxylic acid is heated to the boil for several hours with 5 times the amount of nitrobenzene. The solution turns red and on cooling the dye crystallizes out.



     Example IV: An intimate mixture of 1 part of dimethylphenylthioglycol-o-carbonic acid and 1 part of sulfur is heated to 200-2500 for 8 hours. The cooled and powdered mass is then extracted with carbon disulfide and the remaining dye in
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Claims (1)

entweder a) mit Nitrokohlenwasserstoffen oder Schwefel mit oder ohne indifferente Zusätze er- hitzt, oder b) mit konzentrierten Lösungen von Bisulfit oder Thiosulfat auf, höhere Temperaturen erhitzt, oder c) mit Alkalien oder Essigsäureanhydrid erhitzt, worauf die entstehenden Dimethyloxythionaphtenderivate mit Oxydationsmitteln behandelt werden. either a) heated with nitro hydrocarbons or sulfur with or without inert additives, or b) heated to higher temperatures with concentrated solutions of bisulfite or thiosulfate, or c) heated with alkalis or acetic anhydride, whereupon the resulting dimethyloxythionaphthene derivatives are treated with oxidizing agents.
AT35222D 1907-03-14 1907-03-14 Process for the preparation of tetramethylthioindigo. AT35222B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT35222T 1907-03-14

Publications (1)

Publication Number Publication Date
AT35222B true AT35222B (en) 1908-11-25

Family

ID=3551662

Family Applications (1)

Application Number Title Priority Date Filing Date
AT35222D AT35222B (en) 1907-03-14 1907-03-14 Process for the preparation of tetramethylthioindigo.

Country Status (1)

Country Link
AT (1) AT35222B (en)

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