AT125678B - Process for the preparation of descendants of naphthazarin. - Google Patents

Process for the preparation of descendants of naphthazarin.

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Publication number
AT125678B
AT125678B AT125678DA AT125678B AT 125678 B AT125678 B AT 125678B AT 125678D A AT125678D A AT 125678DA AT 125678 B AT125678 B AT 125678B
Authority
AT
Austria
Prior art keywords
naphthazarin
descendants
sulfuric acid
preparation
condensation products
Prior art date
Application number
Other languages
German (de)
Original Assignee
Ig Farbenindustrie 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 Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Application granted granted Critical
Publication of AT125678B publication Critical patent/AT125678B/en

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

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung von   Abkömmlingen   des   Naphthazarins.   



   Im Stammpatent Nr. 120402 ist beschrieben, dass man durch Umsetzung der wässerigen, blauen
Lösungen der Naphthazarinzwischenprodukte, die nach den Verfahren der deutschen Patentschriften
Nr. 76922,79406, 108551, 114264 oder 134705 erhalten werden, mit Aldehyden wertvolle als Pigment- farbstoffe verwendbare Kondensationsprodukte erhält. 



  Es wurde nun gefunden, dass man zu den gleichen oder ähnlichen Kondensationsprodukten gelangt, wenn man die nach den Verfahren der genannten Patentschriften in   Sehwefelsäurelösung   erzeugten
Naphthazarinzwischenprodukte direkt in der   Schwefelsäurelösung   mit Aldehyden kondensiert und die so erhaltene Lösung der Kondensationsprodukte in   Schwefelsäure gegebenenfalls nach   der Filtration in Wasser giesst. Hiebei scheiden sich die gewünschten Kondensationsprodukte aus. 



   Beispiel :   8 kg 1. 5- Dinitronaphthalin   werden in Gegenwart von 100 konzentrierter Schwefelsäure gemäss dem Verfahren der oben erwähnten deutschen Patente mit Schwefel behandelt. Die so erhaltene
Lösung wird über eine Steinnutsche filtriert, mit festem Paraformaldehyd verrührt, bis die rotbraune
Lösung tief korblumenblau geworden ist und nochmals 24 Stunden verrührt wird. Dann wird in Wasser gegeben, aufgekocht, abfiltriert und ausgewaschen. Man erhält ein schwarzes Pigment, welches sich in konzentrierter Schwefelsäure rotbraun löst. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the preparation of descendants of naphthazarin.



   In the parent patent no. 120402 it is described that by implementing the aqueous, blue
Solutions of naphthazarin intermediates, which are prepared according to the processes of German patents
No. 76922, 79406, 108551, 114264 or 134705, with aldehydes valuable condensation products which can be used as pigment dyes are obtained.



  It has now been found that the same or similar condensation products are obtained if they are produced in sulfuric acid solution by the processes of the patents mentioned
Naphthazarin intermediates are condensed directly in the sulfuric acid solution with aldehydes and the resulting solution of the condensation products in sulfuric acid is poured into water, optionally after filtration. The desired condensation products are precipitated here.



   Example: 8 kg of 1.5-dinitronaphthalene are treated with sulfur in the presence of 100% concentrated sulfuric acid according to the method of the German patents mentioned above. The thus obtained
The solution is filtered through a stone suction filter and stirred with solid paraformaldehyde until the red-brown
Solution has turned deep corflower blue and is stirred again for 24 hours. It is then poured into water, boiled, filtered off and washed out. A black pigment is obtained which dissolves red-brown in concentrated sulfuric acid.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Weitere Ausbildung des Verfahrens zur Darstellung von Abkömmlingen des Naphthazarins nach Stammpatent Nr. 120402, dadurch gekennzeichnet, dass man hier die beispielsweise nach den im Stamm- patent genannten Patentschriften erhältlichen Lösungen der Naphthazarinzwisehenprodukte in Schwefelsäure mit Aldehyden umsetzt und die Kondensationsprodukte, gegebenenfalls nach vorheriger Filtration. durch Eingiessen in Wasser abscheidet. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Further development of the process for the representation of descendants of naphthazarin Parent patent no. 120402, characterized in that the solutions of naphthazarine dissolving products obtainable, for example, according to the patents mentioned in the parent patent in sulfuric acid are reacted with aldehydes and the condensation products, if necessary after previous filtration. separated by pouring into water. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT125678D 1929-09-06 1930-11-17 Process for the preparation of descendants of naphthazarin. AT125678B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT120402T 1929-09-06
DE125678X 1929-11-23

Publications (1)

Publication Number Publication Date
AT125678B true AT125678B (en) 1931-11-25

Family

ID=29402522

Family Applications (1)

Application Number Title Priority Date Filing Date
AT125678D AT125678B (en) 1929-09-06 1930-11-17 Process for the preparation of descendants of naphthazarin.

Country Status (1)

Country Link
AT (1) AT125678B (en)

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