CH182294A - Process for the production of a vat dye. - Google Patents

Process for the production of a vat dye.

Info

Publication number
CH182294A
CH182294A CH182294DA CH182294A CH 182294 A CH182294 A CH 182294A CH 182294D A CH182294D A CH 182294DA CH 182294 A CH182294 A CH 182294A
Authority
CH
Switzerland
Prior art keywords
production
dye
vat dye
violet
act
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 CH182294A publication Critical patent/CH182294A/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Description

  

  Verfahren zur Herstellung eines     Küpenfarbstoifes.       Gegenstand dieses Zusatzpatentes ist ein  Verfahren zur Herstellung eines     Küpenfarb-          stoffes,    welches dadurch gekennzeichnet ist,  dass man     1.4-Benzochinon    auf 2.     2'-Dimethyl-          dihydrodianthron    in der Wärme einwirken  lässt.  



  <I>Beispiel</I>  10 Gewichtsteile     2:2'-Dimethyl-dihydro-          dianthron    der Formel:  
EMI0001.0009     
    werden mit 10 Gewichtsteilen     1.4-Benzo-          chinon    in der zehnfachen Menge Chlorbenzol       längere    Zeit     gekocht.    Nach dem Erkalten    wird der Kristallbrei abgesaugt und mit  Chlorbenzol gewaschen. Darauf wird der  Rückstand zur Reinigung aus einer Mischung  gleicher Teile Alkohol und einfach normaler  Natronlauge ausgekocht bis das heiss abge  saugte Filtrat nicht mehr braun gefärbt ist.

    Nach dem     Neutralwaschen    und Trocknen  stellt der Rückstand einen grünen Farbstoff  dar, der sich in konzentrierter Schwefelsäure  violett löst und aus rotvioletter     Küpe    Baum  wolle grün färbt.  



  Das     2-Methyl-9-anthron    ist aus     p-Methyl-          benzoylbenzoesäure    über die     p-Methylbenzyl-          benzoesäure    und     Ringschluss    der letzteren  erhältlich. Das erwähnte     Anthron    gibt beim  Oxydieren seiner     Eisessiglösung    mit Eisen  chlorid das     2.2'-Dimethyldihydrodianthron,     das aus Benzol in feinen, farblosen Nadeln  vom F. P. 208/209   C kristallisiert. Es  stimmt im Schmelzpunkt mit dem von  Barnett, B. 65,     1565    beschriebenen Produkt  überein. .



  Process for the production of a vat dye. The subject of this additional patent is a process for the production of a vat dye, which is characterized in that 1,4-benzoquinone is allowed to act on 2,2'-dimethyldihydrodianthrone in the heat.



  <I> Example </I> 10 parts by weight of 2: 2'-dimethyl-dihydro-dianthrone of the formula:
EMI0001.0009
    are boiled for a long time with 10 parts by weight of 1,4-benzoquinone in ten times the amount of chlorobenzene. After cooling, the crystal slurry is suctioned off and washed with chlorobenzene. For cleaning, the residue is then boiled from a mixture of equal parts of alcohol and simple normal sodium hydroxide solution until the filtrate which has been sucked off is no longer brown in color.

    After washing neutral and drying, the residue is a green dye that dissolves in concentrated sulfuric acid in a violet color and turns cotton green from a red-violet vat.



  The 2-methyl-9-anthrone can be obtained from p-methylbenzylbenzoic acid via p-methylbenzylbenzoic acid and ring closure of the latter. When its glacial acetic acid solution is oxidized with iron chloride, the aforementioned anthrone gives 2,2'-dimethyldihydrodianthrone, which crystallizes from benzene in fine, colorless needles of F.P. 208/209 C. Its melting point is the same as that of the product described by Barnett, B. 65, 1565. .

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Küpen. farbstoffes, dadurch gekennzeichnet, dass man 1.4-Benzochinon auf 2.2'-Dimethyl,- dihydrodianthron in der Wärme einwirken l ässt. Der so erhältliche Farbstoff ist ein grünes Pulver, das sich in konzentrierter .Schwefel säure violett löst und aus rotvioletter güpe Baumwolle grün färbt. UNTERANSPRÜCEE: 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man die Reaktions komponenten in Gegenwart eines Lösungs mittels aufeinander einwirken lässt. 2. PATENT CLAIM: Method for producing a vat. dye, characterized in that 1.4-benzoquinone is allowed to act on 2.2'-dimethyl, - dihydrodianthrone in the heat. The dye that can be obtained in this way is a green powder that dissolves in concentrated sulfuric acid in violet and turns red-violet güpe cotton to turn it green. SUBClaims: 1. Process according to claim, characterized in that the reaction components are allowed to act on one another in the presence of a solution. 2. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man die Reaktions komponenten in Chlorbenzol längere Zeit unter Rückfluss kocht. Process according to patent claim, characterized in that the reaction components are refluxed for a long time in chlorobenzene.
CH182294D 1933-08-09 1934-08-03 Process for the production of a vat dye. CH182294A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE182294X 1933-08-09
CH176039T 1934-08-03

Publications (1)

Publication Number Publication Date
CH182294A true CH182294A (en) 1936-01-31

Family

ID=25719801

Family Applications (1)

Application Number Title Priority Date Filing Date
CH182294D CH182294A (en) 1933-08-09 1934-08-03 Process for the production of a vat dye.

Country Status (1)

Country Link
CH (1) CH182294A (en)

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