CH126725A - Process for the preparation of 5-nitro-1-aminoanthraquinone-2-carboxylic acid. - Google Patents

Process for the preparation of 5-nitro-1-aminoanthraquinone-2-carboxylic acid.

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Publication number
CH126725A
CH126725A CH126725DA CH126725A CH 126725 A CH126725 A CH 126725A CH 126725D A CH126725D A CH 126725DA CH 126725 A CH126725 A CH 126725A
Authority
CH
Switzerland
Prior art keywords
nitro
carboxylic acid
preparation
aminoanthraquinone
red
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
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
Publication of CH126725A publication Critical patent/CH126725A/en

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Description

  

  Verfahren zur Darstellung von     5-Nitro-l-aminoanthrachinon-2-earbonsäure.       Gegenstand dieser Erfindung ist ein Ver  fahren zur Darstellung von     5-Nitro-l-amino-          anthrachinon-2-carbonsäure,    welches dadurch       gekennzeichnet    ist, dass man das zum Beispiel  durch Einwirkung von rauchender     Schwe-          f        elsäure    auf 1 .     5-Dinitro-2-methylanthra-          chinon    erhältliche     5-Nitroanthrachinon-1    .     2-          isoxazol    mit verseifenden     Mitteln    behandelt.

    <I>Beispiel:</I>  Das durch Einwirkung von rauchender  Schwefelsäure auf     1.5-Dinitro-2-methylan-          thrachinon    erhältliche Produkt     (5-Nitroan-          thrachinon-1.        2-isoxazol)    wird mit überschüs  siger verdünnter     Ätzalkalilauge    oder Soda  lösung unter Umrühren auf etwa 80 bis     90           erwärmt,    bis Lösung mit roter Farbe einge  treten ist.

   Aus der filtrierten Lösung erhält  man durch Fällung mit einer verdünnten  Mineralsäure die 5 -     Nitro    -1 -     aminoanthra.        -          chinon-2-carbonsäure.    Sie gleicht in ihren  Eigenschaften der nicht     nitrierten        1-Amino-          anthrachinon-2-carbQus4üre.    Aus     den    kräftig    roten Lösungen ihrer     Alkalisalze    fällen  Säuren die     Aminonitrocarbonsäure    in roten  Flocken, die bei 325  schmelzen.

   Sie ist un  löslich in Wasser, sehr schwer löslich in den  gebräuchlichen niedrig siedenden organischen  Lösungsmitteln, etwas reichlicher in heissem  Nitrobenzol mit gelbroter Farbe. Die gelb  braune Farbe ihrer Lösung in konzentrierter  Schwefelsäure schlägt auf Zusatz von For  maldehyd sofort in ein tiefes Blau um.



  Process for the preparation of 5-nitro-1-aminoanthraquinone-2-carboxylic acid. The subject of this invention is a method for the preparation of 5-nitro-1-amino-anthraquinone-2-carboxylic acid, which is characterized in that it is produced, for example, by the action of fuming sulfuric acid on 1. 5-dinitro-2-methylanthraquinone available 5-nitroanthraquinone-1. 2- isoxazole treated with saponifying agents.

    <I> Example: </I> The product obtainable through the action of fuming sulfuric acid on 1,5-dinitro-2-methylanthrachinone (5-nitroanthrachinone-1,2-isoxazole) is mixed with excess dilute caustic alkali or soda solution Stir heated to about 80 to 90 until solution with red color has entered.

   The 5-nitro-1-aminoanthra is obtained from the filtered solution by precipitation with a dilute mineral acid. - quinone-2-carboxylic acid. Its properties are similar to the non-nitrated 1-amino-anthraquinone-2-carbQus4ure. Acids precipitate the aminonitrocarboxylic acid in red flakes from the bright red solutions of their alkali salts, which melt at 325.

   It is insoluble in water, very sparingly soluble in the usual low-boiling organic solvents, somewhat more abundantly in hot nitrobenzene with a yellow-red color. The yellow-brown color of its solution in concentrated sulfuric acid changes immediately to a deep blue when formaldehyde is added.

Claims (1)

PATENTANSPRUCH Verfahren zur Darstellung von 5-Nitro- 1-aminoanthrachinon-2-carbonsäure, dadurch gekennzeichnet, dass man das 5-Nitroanthra- chinon-1.2-isoxazol mit verseifenden Mit teln behandelt. Aus den kräftig roten Lösungen ihrer Alkalisalze fällen Säuren die Aminonitro- carbonsäure in roten Flocken, die bei 325 schmelzen. Sie ist unlöslich in Wasser, sehr schwer löslich in den gebräuchlichen niedrig siedenden organischen Lösungsmitteln, etwas reichlicher in heissem Nitrobenzol mit gelb roter Farbe. PATENT CLAIM Process for the preparation of 5-nitro-1-aminoanthraquinone-2-carboxylic acid, characterized in that the 5-nitroanthraquinone-1,2-isoxazole is treated with saponifying agents. Acids precipitate the aminonitrocarboxylic acid in red flakes from the bright red solutions of their alkali salts, which melt at 325. It is insoluble in water, very sparingly soluble in the common low-boiling organic solvents, somewhat more abundantly in hot nitrobenzene with a yellow-red color. Die gelbbraune Farbe ihrer Lö- sung in konzentrierter Schwefelsäure schlägt auf Zusatz von Formaldehyd sofort in ein tiefes Blau um. The yellow-brown color of its solution in concentrated sulfuric acid changes immediately to a deep blue when formaldehyde is added.
CH126725D 1926-03-08 1927-03-07 Process for the preparation of 5-nitro-1-aminoanthraquinone-2-carboxylic acid. CH126725A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE126725X 1926-03-08
CH125478T 1927-03-07

Publications (1)

Publication Number Publication Date
CH126725A true CH126725A (en) 1928-07-02

Family

ID=25710483

Family Applications (1)

Application Number Title Priority Date Filing Date
CH126725D CH126725A (en) 1926-03-08 1927-03-07 Process for the preparation of 5-nitro-1-aminoanthraquinone-2-carboxylic acid.

Country Status (1)

Country Link
CH (1) CH126725A (en)

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