AT52937B - Process for the preparation of 3-nitro-4-oxyarylarsinic acids. - Google Patents

Process for the preparation of 3-nitro-4-oxyarylarsinic acids.

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Publication number
AT52937B
AT52937B AT52937DA AT52937B AT 52937 B AT52937 B AT 52937B AT 52937D A AT52937D A AT 52937DA AT 52937 B AT52937 B AT 52937B
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AT
Austria
Prior art keywords
nitro
acids
oxyarylarsinic
preparation
acid
Prior art date
Application number
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German (de)
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Hoechst Ag
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Publication date
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Publication of AT52937B publication Critical patent/AT52937B/en

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Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung von 3-Nitro-4-oxyarylarsinsäuren. 



   Es wurde gefunden, dass die   3-Nitro-4-oxyaryl-I-arsinsäuren   aus 3-Nitro-4-aminoaryl-1-arsinsäuren durch Erwärmen mit Ätzalkalilauge hergestellt werden können. 



   Beispiel: 10 kg Nitroaminophenylarsinsäure, die man durch Nitrieren von Oxalyl- 
 EMI1.1 
 säurerestes herstellen kann, werden mit 60   l   Kalilauge von 360 Bé verrührt und auf etwa 800 C erwärmt, bis eine Probe durch Diazotieren und Zusammenbringen mit R-Salz die Abwesenheit der Nitroaminophenylarsinsäure erkennen lässt. Aus der dann mit Wasser verdünnten und mit Salzsäure übersättigten Lösung scheidet sich die Nitrophenolarsinsäure aus. Sie ist ein gelblich weisses Pulver, das in heissem Wasser und in Alkohol leicht   löslich   ist, mit Alkalien bildet sie gelbe Lösungen, aus denen sie durch   Mineralsäure   abgeschieden wird. Unter der Einwirkung von Reduktionsmitteln geht sie zunächst in Aminooxyarsinsäure über. 

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



   <Desc / Clms Page number 1>
 



  Process for the preparation of 3-nitro-4-oxyarylarsinic acids.



   It has been found that the 3-nitro-4-oxyaryl-1-arsinic acids can be prepared from 3-nitro-4-aminoaryl-1-arsinic acids by heating with caustic alkali.



   Example: 10 kg of nitroaminophenylarsinic acid obtained by nitrating oxalyl
 EMI1.1
 acid residues are mixed with 60 l potassium hydroxide solution of 360 Bé and heated to about 800 C until a sample reveals the absence of nitroaminophenylarsinic acid by diazotizing and combining with R salt. The nitrophenolar acid precipitates from the solution, which is then diluted with water and oversaturated with hydrochloric acid. It is a yellowish white powder that is easily soluble in hot water and alcohol; with alkalis it forms yellow solutions from which it is separated by mineral acid. Under the action of reducing agents, it first changes into aminooxyarsinic acid.

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

Claims (1)

In analoger Weise ist beispielsweise die Nitro-o-kresolarsinsäure aus o-Toluidinarsin- saureerhältlich. l'ATENT ANSPRUCH : EMI1.2 **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. In an analogous manner, for example, nitro-o-cresolar acid can be obtained from o-toluidinarsinic acid. l'ATENT CLAIM: EMI1.2 ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT52937D 1910-05-24 1911-02-17 Process for the preparation of 3-nitro-4-oxyarylarsinic acids. AT52937B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE52937X 1910-05-24

Publications (1)

Publication Number Publication Date
AT52937B true AT52937B (en) 1912-04-10

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ID=5627468

Family Applications (1)

Application Number Title Priority Date Filing Date
AT52937D AT52937B (en) 1910-05-24 1911-02-17 Process for the preparation of 3-nitro-4-oxyarylarsinic acids.

Country Status (1)

Country Link
AT (1) AT52937B (en)

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