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CH249026A - Process for the preparation of an ester type azo dye derivative. - Google Patents

Process for the preparation of an ester type azo dye derivative.

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Publication number
CH249026A
CH249026A CH249026DA CH249026A CH 249026 A CH249026 A CH 249026A CH 249026D A CH249026D A CH 249026DA CH 249026 A CH249026 A CH 249026A
Authority
CH
Switzerland
Prior art keywords
preparation
azo dye
ester type
dye derivative
dye
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft Ciba
Original Assignee
Ciba Geigy
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 Ciba Geigy filed Critical Ciba Geigy
Publication of CH249026A publication Critical patent/CH249026A/en

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

Description

  

      Verfahren    zur Herstellung eines     esterartigen        Azofarbstoffderivates.       Gegenstand' des vorliegenden Zusatz  patentes ist ein Verfahren zur Herstellung  eines     esterartigen        Derivates    eines     o,o'-Dioxy-          azofarbstoffes,    dadurch     gekennzeichnet,    dass  der     Azofarbstoff    aus     diazotiertem        1-Oxy-2-          a.mino-5-nitrobenzol    und     2-Oxy-4,

  6-dibrom-          naphtalin    in Gegenwart von     Pyridin    mit       Benzoesäure-3-sulfochlorid        verestert    wird.  



  Das neue     Farbstoffderivat    bildet nach  dem Aufarbeiten und Trocknen ein rotes,  wasserlösliches Pulver. Es färbt Wolle nach  dem     Einbadverfahren    in     Gegenwart    chrom  abgebender     Mittel    in blaugrauen Tönen.    <I>Beispiel:</I>    62 Teile     Benzoesäure-3-sulfochlorid    wer  den in 270 Teilen     Pyridin    bei 50-60  ge  löst.

   Bei 40-50  werden 46,7 Teile des     Azo-          farbstoffes    aus     dia.zotiertem        1-Oxy-2-amino-          5-nitrobenzol    und     2-Oxy-4,6-dibromnaphta-          lin        unter    gutem Rühren zugegeben. Nach  zwei Stunden ist die     Veresterung    beendet.

      Dann     wird    das     Pyridin    im Vakuum     abde-          stilliert,    der     Destillätionsrückstand    in etwa  500 Teilen Wasser aufgenommen und der       Farbstoffester    mit 100 Teilen Natrium  chlorid     ausgesalzen.    Die Masse wird ver  rührt, bis das     Farbstoffderivat    gut     filtrier-          bar    geworden ist. Hierauf wird     abfiltriert     und im Vakuum getrocknet.



      Process for the preparation of an ester type azo dye derivative. The subject of the present additional patent is a process for the preparation of an ester-like derivative of an o, o'-dioxy azo dye, characterized in that the azo dye is made from diazotized 1-oxy-2- a.mino-5-nitrobenzene and 2-oxy- 4,

  6-dibromonaphthalene is esterified with benzoic acid 3-sulfochloride in the presence of pyridine.



  After working up and drying, the new dye derivative forms a red, water-soluble powder. It dyes wool by the single bath process in the presence of chromium-releasing agents in blue-gray tones. <I> Example: </I> 62 parts of benzoic acid 3-sulfochloride are dissolved in 270 parts of pyridine at 50-60 ge.

   At 40-50, 46.7 parts of the azo dye from dia.zotierter 1-oxy-2-amino-5-nitrobenzene and 2-oxy-4,6-dibromonaphthalene are added with thorough stirring. The esterification is complete after two hours.

      The pyridine is then distilled off in vacuo, the residue from the distillation is taken up in about 500 parts of water and the dye ester is salted out with 100 parts of sodium chloride. The mass is stirred until the dye derivative has become easily filterable. It is then filtered off and dried in vacuo.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines ester- artigen Derivates eines o,ö -Dioxyazofarb- stoffes, dadurch gekennzeichnet, dass der Azofarbstoff aus diazotiertem 1 - Oxy - 2- amino-5-nitrobenzol und 2-Oxy-4, PATENT CLAIM: A process for the preparation of an ester-like derivative of an o, ö -dioxyazo dye, characterized in that the azo dye is made from diazotized 1 - oxy - 2-amino-5-nitrobenzene and 2-oxy-4, 6-dibrom- naphtalin in Gegenwart von Pyridin mit Benzoesäure-3-sulfochlorid verestert wird. Das neue Farbstoffderivat bildet nach dem Aufarbeiten und Trocknen ein rotes, wasserlösliches Pulver. Es färbt Wolle nach dem Einbadverfahren in Gegenwart chrom abgebender Mittel in blaugrauen Tönen. 6-dibromonaphthalene is esterified with benzoic acid 3-sulfochloride in the presence of pyridine. After working up and drying, the new dye derivative forms a red, water-soluble powder. It dyes wool by the single bath process in the presence of chromium-releasing agents in blue-gray tones.
CH249026D 1944-10-06 1944-10-06 Process for the preparation of an ester type azo dye derivative. CH249026A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH249026T 1944-10-06
CH244049T 1945-08-22

Publications (1)

Publication Number Publication Date
CH249026A true CH249026A (en) 1947-05-31

Family

ID=25728880

Family Applications (1)

Application Number Title Priority Date Filing Date
CH249026D CH249026A (en) 1944-10-06 1944-10-06 Process for the preparation of an ester type azo dye derivative.

Country Status (1)

Country Link
CH (1) CH249026A (en)

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