CH173983A - Process for the preparation of a dye of the anthracene series. - Google Patents

Process for the preparation of a dye of the anthracene series.

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Publication number
CH173983A
CH173983A CH173983DA CH173983A CH 173983 A CH173983 A CH 173983A CH 173983D A CH173983D A CH 173983DA CH 173983 A CH173983 A CH 173983A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
anthracene series
leuco
anthracene
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 CH173983A publication Critical patent/CH173983A/en

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

Description

  

  Verfahren zur Darstellung eines Farbstoffes der     Anthracenr        eihe.       Gegenstand vorliegenden Patentes ist ein  Verfahren zur Darstellung eines Farbstoffes  der     Anthracenreihe,    welches dadurch ge  kennzeichnet ist, dass man den     Leukoschwe-          felsäureester    aus     2-Amidoanthrachinon-3-          äthyIsulfon    in alkalischem Medium mit Blei  superoxyd oxydiert.  



  <I>Beispiel:</I>  50 Gewichtsteile     Dikaliumsalz    des aus       2-Acetylamidoanthrachinon-3-äthylsulfon    dar  gestellten     Leukoschwefelsäureesters    werden  in 500 Gewichtsteilen Wasser gelöst. Nach  Zusatz von 20 Gewichtsteilen     Ätzkali    erhitzt  man auf etwa<B>900,</B> bis die Abspaltung der       Acetylgruppe    erfolgt ist.

   Dann werden 140       (xewichtsteile    einer     Bleisuperoxydpasta    von       50        %        zugesetzt        und        das        Ganze        etwa    2     Stun-          den    auf 70-80   erhitzt. Nach dem Erkalten  wird abgesaugt und der Rückstand mit  heissem Wasser ausgezogen.

   Das aus dem  Filtrat durch     Aussalzen    mit     Kaliumchlorid       abgeschiedene, bisher noch nicht bekannte       Leukoestersalz    bildet orangefarbene Kristalle,  die sich in Wasser mit intensiv gelber Farbe  lösen. Durch saure Oxydation wird ein     grün-          stichiges    Blau erhalten von vermutlich fol  gender Konstitution  
EMI0001.0029     




  Process for the preparation of a dye of the anthracene series. The subject of the present patent is a process for the preparation of a dye of the anthracene series, which is characterized in that the leuco-sulfuric acid ester from 2-amidoanthraquinone-3-ethy-sulfone is oxidized in an alkaline medium with lead superoxide.



  <I> Example: </I> 50 parts by weight of the dipotassium salt of the leuco-sulfuric acid ester made from 2-acetylamidoanthraquinone-3-ethylsulfone are dissolved in 500 parts by weight of water. After adding 20 parts by weight of caustic potash, the mixture is heated to about 900 until the acetyl group has been split off.

   Then 140 parts by weight of a lead peroxide paste of 50% are added and the whole is heated to 70-80 for about 2 hours. After cooling, it is suctioned off and the residue is extracted with hot water.

   The previously unknown leuco ester salt separated from the filtrate by salting out with potassium chloride forms orange-colored crystals which dissolve in water with an intense yellow color. Acid oxidation gives a greenish blue, presumably of the following constitution
EMI0001.0029

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Farb stoffes der Anthracenreihe, dadurch gekenn- zeichnet, dass man den Leukoschwefelsäure- ester aus 2-Amidoanthrachinon-3-äthylsulfon in alkalischem Medium mit Bleisuperoxyd oxydiert. Das Produkt stellt orangefarbene Kristalle dar, die sich in Wasser mit intensiv gelber Farbe lösen. PATENT CLAIM: Process for the preparation of a dye of the anthracene series, characterized in that the leuco-sulfuric acid ester of 2-amidoanthraquinone-3-ethylsulfone is oxidized in an alkaline medium with lead peroxide. The product is orange crystals that dissolve in water with an intense yellow color.
CH173983D 1932-03-26 1933-03-21 Process for the preparation of a dye of the anthracene series. CH173983A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE173983X 1932-03-26
CH170092T 1933-03-21

Publications (1)

Publication Number Publication Date
CH173983A true CH173983A (en) 1934-12-15

Family

ID=25718869

Family Applications (1)

Application Number Title Priority Date Filing Date
CH173983D CH173983A (en) 1932-03-26 1933-03-21 Process for the preparation of a dye of the anthracene series.

Country Status (1)

Country Link
CH (1) CH173983A (en)

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