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CH154049A - Process for the preparation of a vat dye. - Google Patents

Process for the preparation of a vat dye.

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Publication number
CH154049A
CH154049A CH154049DA CH154049A CH 154049 A CH154049 A CH 154049A CH 154049D A CH154049D A CH 154049DA CH 154049 A CH154049 A CH 154049A
Authority
CH
Switzerland
Prior art keywords
preparation
vat dye
dye
bromine
vat
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 CH154049A publication Critical patent/CH154049A/en

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Description

  

  Verfahren zur Darstellung eines     Küpenfarbstoffes.       Im Hauptpatent ist ein Verfahren zur  Darstellung eines     Küpenfarbstoffes    beschrie  ben, bei dem     Monoäthoxypyranthron    mit  einem     bromierend    wirkenden Mittel behan  delt     wird.     



  Es wurde nun gefunden, dass man einen  ähnlichen, wertvollen     Küpenfarbstoff    erhal  ten kann, wenn man 1     Mol    Bz.     Bz'-Di-          methoxypyranthron    der Formel.  
EMI0001.0010     
    erhältlich aus     w    .     co'-Tetrabrom-2    . 2'-dime-         thyl-l-1'-dianthra.chinonyl    durch Behandeln  :

  mit Kupferbronze in saurer Lösung bei     5(l     bis<B>100</B>   C und     Methylierung    des erhaltenen  Bz.     Bz'-Dioxy        pyranthrons,    mit einem     bro-          mierend    wirkenden Mittel bis zur Aufnahme  von zwei Atomen Brom behandelt.  



  Der neue. Farbstoff löst sich in konzen  trierter Schwefelsäure mit blauer Farbe und       liefert    auf Baumwolle aus violetter     Küpe     orangefarbene, kräftige Töne von sehr guter  Echtheit.  



       Beispiel:     44 Teile Bz.     Bz'-Dimethoxypy        ranthron     werden bei 0   C in 500 Teilen     Chlorsulfon-          säure    gelöst und nach Zugabe von vier Tei  len Schwefel unter Rühren mit 17 Teilen  Brom versetzt. Darauf erwärmt man auf  bis 30   C und rührt so lange, bis alles Brom  aufgenommen ist, giesst in Eiswasser, saugt  ab und wäscht neutral.



  Process for the preparation of a vat dye. In the main patent, a process for the preparation of a vat dye is described ben in which monoethoxypyranthrone is treated with a brominating agent.



  It has now been found that you can get a similar, valuable vat dye if you add 1 mole of Bz. Bz'-dimethoxypyranthrone of the formula.
EMI0001.0010
    available from w. co'-tetrabromo-2. 2'-dimethyl-l-1'-dianthra.chinonyl by treating:

  treated with copper bronze in acidic solution at 5 (l to <B> 100 </B> C) and methylation of the obtained Bz. Bz'-dioxy pyranthrone, with a brominating agent until two atoms of bromine are absorbed.



  The new. Dye dissolves in concentrated sulfuric acid with a blue color and produces orange-colored, strong shades of very good fastness on cotton from a violet vat.



       Example: 44 parts Bz. Bz'-Dimethoxypyranthron are dissolved in 500 parts of chlorosulfonic acid at 0 C and, after adding four parts of sulfur, 17 parts of bromine are added while stirring. The mixture is then heated to 30 ° C. and stirred until all the bromine has been absorbed, poured into ice water, filtered off with suction and washed neutral.

Claims (1)

PATENTÄNSPRUCH: Verfahren zur Darstellung eines Küpen- farbstoffes, dadurch gekennzeichnet, dass man 1 Mol Bz. Bz'-Dimethoxypyranthron der folgenden Formel, EMI0002.0007 mit einem bromierend wirkenden Mittel bis zur Aufnahme von zwei Atomen Brom be handelt. Der neue Farbstoff löst sich in konzen trierter Schwefelsäure mit blauer Farbe und liefert auf Baumwolle aus violetter Iiüpe orangefarbene, kräftige Töne von sehr guter Echtheit. PATENT CLAIM: Process for the preparation of a vat dye, characterized in that 1 mol of Bz. Bz'-dimethoxypyranthrone of the following formula, EMI0002.0007 with a brominating agent up to the absorption of two atoms of bromine. The new dye dissolves in concentrated sulfuric acid with a blue color and provides strong, orange-colored shades of very good fastness on cotton made of violet Iiüpe.
CH154049D 1928-10-19 1929-08-27 Process for the preparation of a vat dye. CH154049A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE154049X 1928-10-19
CH150922T 1929-08-27

Publications (1)

Publication Number Publication Date
CH154049A true CH154049A (en) 1932-04-15

Family

ID=25715727

Family Applications (1)

Application Number Title Priority Date Filing Date
CH154049D CH154049A (en) 1928-10-19 1929-08-27 Process for the preparation of a vat dye.

Country Status (1)

Country Link
CH (1) CH154049A (en)

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