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.

Info

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
Other languages
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

Links

Landscapes

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

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)

Country Link
CH (1) CH150615A (en)

Similar Documents

Publication Publication Date Title
US1237405A (en) Production of new tanning materials.
CH150615A (en) Process for splitting off sulfo groups from 1,4,5,8-diaminodioxyanthraquinone disulfonic acids.
DE554325C (en) Process for the preparation of acidic wool dyes of the anthraquinone series
AT106981B (en) Process for the production of acid-free, pure, resinous condensation products from phenols and aldehydes.
DE478272C (en) Process for the production of sulphonic acids
DE547744C (en) Process for refining tanning agents containing neutral salt
DE413380C (en) Process for the preparation of pure 1-nitro-2-methylanthraquinone
DE530894C (en) Process for the preparation of aromatic sulfonic acid dihalamides
DE557127C (en) Process for the preparation of a stable, water-soluble sulfuric acid ester of the leuco compound of 4, 6-dichloro-6&#39;-methoxy-bis-thionaphthene-indigo
AT138005B (en) Process for tanning animal hides.
CH221827A (en) Process for the production of a new condensation product.
CH106134A (en) Process for the production of a vat dye.
CH170688A (en) Process for the preparation of 1,4-diaminoanthraquinone-2,3-disulfonic acid.
CH214348A (en) Process for the preparation of a therapeutically useful sulfo compound.
CH169923A (en) Process for the production of a textile auxiliary.
CH162155A (en) Process for tanning animal hides.
CH164734A (en) Process for the preparation of a new sulfonic acid.
CH164736A (en) Process for the preparation of a new sulfonic acid.
CH145839A (en) Process for the production of a metal-containing dye.
CH107333A (en) Process for the preparation of an anthracene derivative.
DE1034858B (en) Process for the production of a resin from dicyandiamide and formaldehyde which is stable in aqueous solution and does not gel
CH140923A (en) Process for the preparation of a tanning agent.
CH178944A (en) Process for the preparation of 2-oxydiphenyl ether-5-carboxylic acid.
CH114289A (en) Process for the production of condensation products from urea BEzw. its derivatives and formaldehyde.
CH265712A (en) Process for the preparation of a derivative of 4-methyl-7-ethylamino-coumarin.