CH150615A - Process for splitting off sulfo groups from 1,4,5,8-diaminodioxyanthraquinone disulfonic acids. - Google Patents

Process for splitting off sulfo groups from 1,4,5,8-diaminodioxyanthraquinone disulfonic acids.

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Publication number
CH150615A
CH150615A CH150615DA CH150615A CH 150615 A CH150615 A CH 150615A CH 150615D A CH150615D A CH 150615DA CH 150615 A CH150615 A CH 150615A
Authority
CH
Switzerland
Prior art keywords
splitting
diaminodioxyanthraquinone
sulfo groups
parts
disulfonic acids
Prior art date
Application number
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German (de)
Inventor
Gesellschaft Fuer Chemis Basel
Original Assignee
Chem Ind Basel
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 Chem Ind Basel filed Critical Chem Ind Basel
Publication of CH150615A publication Critical patent/CH150615A/en

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Description

  

  Verfahren zur Abspaltung von     Sulfogruppen    aus 1,4, 6,     8-Diaminodiogyanthraevinon-          disulfosäuren.       Die Abspaltung von     Sulfogruppen    aus  1, 4, 5,     8-Diaminodioxyanthrachiuondisulfosäu-          ren    durch Behandeln dieser Verbindungen in  wässerigen Lösungen mit     Natriumhydrosulfit     oder anderen geeigneten Reduktionsmitteln  ist bereits beschrieben worden.  



  Es wurde nun gefunden, dass diese Re  duktion in besonders glatter Weise vor sich  geht, wenn man sie in Gegenwart von Bor  säure durchführt.    <I>Beispiel</I>  5 Teile     1,5-Diamino-4,        8-dioxyanthrachi-          non-3,        7-disulfosäure    werden in 70 Teilen  Wasser mit 3,7 Teilen kristallisierter Bor  säure auf<B>95-1000</B> erwärmt, hierauf gibt  man 6,2 Teile     Natriumhydrosulfit,    in 40 Tei  len Wasser gelöst, hinzu und erhitzt kurze  Zeit weiter auf 95-100 . Man filtriert heiss  und wäscht heiss aus, bis das Filtrat farblos  abläuft.

   Beim Trocknen des Rückstandes er  hält man ca. 3 Teile     1,5-Diamino-4,    8-dioxy-         anthrachinon.    Es ist nicht notwendig, die  Reaktion unter     Luftabschluss    auszuführen.  Führt man dieselbe Reaktion ohne Zusatz  von Borsäure aus, so erhält man kein was  serunlösliches Produkt.  



  Ähnlich verläuft die Reaktion mit der       1,8-Diamino    -4,5 -     dioxyanthrachinon    - 3,6 -     di-          sulfosäure.       <I>Beispiel 2:</I>    6,25 Teile     1,5-diamino-4,        8-dioxyanthrachi-          non-3,        7-disulfosaures    Natrium werden in  70 Teilen Wasser unter     Luftabschluss    mit 6 Tei  len     Natriumhydrosulfit    auf 50   erwärmt.  Hierauf gibt man 3, 7 Teile kristallisierte  Borsäure hinzu, erhitzt ca. eine     Stunde    auf  95-100  , filtriert heiss und wäscht heiss aus,  bis das Filtrat farblos abläuft.  



  Beim Trocknen unter     Luftabschluss    erhält       8-di-          man        oxyanthrachinon.        ca.        2,9        Teile        Leuko-1,5-diamino-4.  



  Process for splitting off sulfo groups from 1,4, 6, 8-diaminodiogyanthraevinone disulfonic acids. The splitting off of sulfo groups from 1, 4, 5, 8-diaminodioxyanthrachiuondisulfoäu- ren by treating these compounds in aqueous solutions with sodium hydrosulfite or other suitable reducing agents has already been described.



  It has now been found that this reduction is particularly smooth when it is carried out in the presence of boric acid. <I> Example </I> 5 parts of 1,5-diamino-4, 8-dioxyanthraquinone-3, 7-disulfonic acid are in 70 parts of water with 3.7 parts of crystallized boric acid to <B> 95-1000 < / B> heated, then 6.2 parts of sodium hydrosulfite, dissolved in 40 parts of water, are added and the mixture is heated to 95-100 for a short time. It is filtered hot and washed hot until the filtrate runs colorless.

   When the residue dries, about 3 parts of 1,5-diamino-4, 8-dioxy-anthraquinone are kept. It is not necessary to carry out the reaction in the absence of air. If the same reaction is carried out without the addition of boric acid, no product which is insoluble in water is obtained.



  The reaction with 1,8-diamino -4,5-dioxyanthraquinone-3,6-disulfonic acid proceeds in a similar way. <I> Example 2: </I> 6.25 parts of 1,5-diamino-4, 8-dioxyanthraquinone-3, 7-disulfonic acid sodium are heated to 50 parts with 6 parts of sodium hydrosulfite in 70 parts of water with exclusion of air. 3.7 parts of crystallized boric acid are then added, the mixture is heated to 95-100 for about an hour, filtered hot and washed hot until the filtrate is colorless.



  8-dimane oxyanthraquinone is obtained when drying in the absence of air. approx. 2.9 parts of leuco-1,5-diamino-4.

Claims (1)

PATENTANSPRUCH: Verfahren zur Abspaltung der Sulfogrup- pen aus 1, 4, 5, 8-Diaminodioxyanthrachinon- disulfosäuren durch Behandlung mit Reduk tionsmitteln in wässeriger Lösung, dadurch gekennzeichnet, dass die Reaktion in Gegen wart von Borsäure durchgeführt wird. PATENT CLAIM: Process for splitting off the sulfo groups from 1, 4, 5, 8-diaminodioxyanthraquinone disulfonic acids by treatment with reducing agents in aqueous solution, characterized in that the reaction is carried out in the presence of boric acid.
CH150615D 1930-11-07 1930-11-07 Process for splitting off sulfo groups from 1,4,5,8-diaminodioxyanthraquinone disulfonic acids. CH150615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH150615T 1930-11-07

Publications (1)

Publication Number Publication Date
CH150615A true CH150615A (en) 1931-11-15

Family

ID=4406007

Family Applications (1)

Application Number Title Priority Date Filing Date
CH150615D CH150615A (en) 1930-11-07 1930-11-07 Process for splitting off sulfo groups from 1,4,5,8-diaminodioxyanthraquinone disulfonic acids.

Country Status (1)

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CH (1) CH150615A (en)

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