CH185142A - Process for the preparation of 1: 8-dicarboxynaphthalene-4-carboxyethylanilide anhydride. - Google Patents

Process for the preparation of 1: 8-dicarboxynaphthalene-4-carboxyethylanilide anhydride.

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Publication number
CH185142A
CH185142A CH185142DA CH185142A CH 185142 A CH185142 A CH 185142A CH 185142D A CH185142D A CH 185142DA CH 185142 A CH185142 A CH 185142A
Authority
CH
Switzerland
Prior art keywords
acetic acid
acid
carboxyethylanilide
anhydride
dicarboxynaphthalene
Prior art date
Application number
Other languages
German (de)
Inventor
Limited Imperial Ch Industries
Original Assignee
Ici Ltd
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 Ici Ltd filed Critical Ici Ltd
Publication of CH185142A publication Critical patent/CH185142A/en

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Description

  

  Verfahren zur Herstellung von     1:8-Dikarboxynaphthalin-4-karboxyäthylanilidanhydrid.       Gemäss der vorliegenden Erfindung erhält  man 1:     8-Dikarboxynaphthalin-4-karboxyäthyl-          anilidanhydrid    durch Oxydation von     Acenaph-          then-5-karboxy        äthylarrilid    in Chromsäure  enthaltender Essigsäure. Die Chromsäure  enthaltende Essigsäure kann durch Zusetzen  von Chromsäure zur Essigsäure, oder durch  Zusetzen einer Substanz, wie Natrium- oder       Kaliumdichromat,    welches Chromsäure mit  Essigsäure ergibt, erhalten werden.  



  Das     1:8-Dikarboxyriaphthalin-4-karboxy-          äthylanilidanhydrid    ist eine neue Verbin  dung. Es ist gelb und löst sich in Natrium  kärbonatlösung, aus welcher durch Zusetzen  von Mineralsäure eine Fällung erhalten wird.  



  Es wird als Zwischenmittel bei der Her  stellung von Farbstoffen verwendet werden.  <I>Beispiel:</I>  Einer kochenden Lösung von 135 Teilen       Acenaphthen-5-karboxyäthylarrilid    in<B>1600</B>    Teilen Eisessig werden 300 Teile     Natrium-          dichromat    in Portionen währen 2 Stunden  und dann weitere 75 Teile während     11z     Stunden zugesetzt. Nach weiterem halbstün  digem Kochen wird das Gemisch in 5000  Teile Wasser geschüttet, die sich ergebende  Fällung     abgefiltert,    von Chromsalzen frei  gewaschen und gereinigt durch Auflösung in       Natriumkarbonatlösung,    Filterung und Fällen  mit Mineralsäure.



  Process for the preparation of 1: 8-dicarboxynaphthalene-4-carboxyethylanilide anhydride. According to the present invention, 1: 8-dicarboxynaphthalene-4-carboxyethyl anilide anhydride is obtained by oxidation of acenaphthene-5-carboxy ethyl arylide in acetic acid containing chromic acid. The acetic acid containing chromic acid can be obtained by adding chromic acid to acetic acid, or by adding a substance such as sodium or potassium dichromate which gives chromic acid with acetic acid.



  The 1: 8-dicarboxyriaphthalene-4-carboxy-ethylanilide anhydride is a new compound. It is yellow and dissolves in sodium carbonate solution, from which a precipitate is obtained by adding mineral acid.



  It is used as an intermediate in the manufacture of dyes. <I> Example: </I> A boiling solution of 135 parts of acenaphthene-5-carboxyäthylarrilid in <B> 1600 </B> parts of glacial acetic acid becomes 300 parts of sodium dichromate in portions for 2 hours and then a further 75 parts for 11z hours added. After another half-hour digem boiling, the mixture is poured into 5000 parts of water, the resulting precipitate is filtered off, washed free of chromium salts and purified by dissolving in sodium carbonate solution, filtering and precipitating with mineral acid.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von 1:8-Di karboxynaphthalin-4-karboxyäthylanilidanhy- drid, dadurch gekennzeichnet, dass man Ace- naphthen-5-karboxyäthylanilid mit Chrom säure in Essigsäure oxydiert. Das neue Produkt ist gelb und löst sich in Natriumkarbonatlösung auf, von welcher durch Zusatz von Mineralsäure eine Fällung erhalten wird. ÜNTER,ANSPItsso <B>m</B>1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man zur Oxydation Chromsäure verwendet, die durch Eintra gen von Natriumdichromat in die Essig säure erhalten wurde. 2. PATENT CLAIM: Process for the production of 1: 8-Di carboxynaphthalene-4-carboxyethylanilidanhydride, characterized in that acetic acid is oxidized with chromic acid in acetic acid. Acenaphthene-5-carboxyethylanilide. The new product is yellow and dissolves in sodium carbonate solution, from which a precipitate is obtained by adding mineral acid. ÜNTER, ANSPItsso <B> m </B> 1. Process according to patent claim, characterized in that chromic acid is used for the oxidation which was obtained by introducing sodium dichromate into the acetic acid. 2. Verfahren nach Patentacispruch, dadurch gekennzeichnet, dass man zur Oxydation Chromsäure verwendet, die durch tintra- gen von Kaliumdichromat in die Essig säure erhalten wurde. Process according to patent claim, characterized in that chromic acid is used for the oxidation, which was obtained by transferring potassium dichromate into acetic acid.
CH185142D 1934-07-05 1935-06-26 Process for the preparation of 1: 8-dicarboxynaphthalene-4-carboxyethylanilide anhydride. CH185142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB185142X 1934-07-05

Publications (1)

Publication Number Publication Date
CH185142A true CH185142A (en) 1936-07-15

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ID=10113729

Family Applications (1)

Application Number Title Priority Date Filing Date
CH185142D CH185142A (en) 1934-07-05 1935-06-26 Process for the preparation of 1: 8-dicarboxynaphthalene-4-carboxyethylanilide anhydride.

Country Status (1)

Country Link
CH (1) CH185142A (en)

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