CH141780A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH141780A
CH141780A CH141780DA CH141780A CH 141780 A CH141780 A CH 141780A CH 141780D A CH141780D A CH 141780DA CH 141780 A CH141780 A CH 141780A
Authority
CH
Switzerland
Prior art keywords
sep
preparation
azo dye
dye
anilide
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 CH141780A publication Critical patent/CH141780A/en

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

Description

  

  Verfahren zur Darstellung eines     Azofurbstoffes.       Gegenstand der vorliegenden Erfindung  ist ein Verfahren zur Darstellung eines     Azo-          fa.rbstoffes    der folgenden Formel.:  
EMI0001.0004     
    den man     @durch    Kupplung der     Dia.zoverbin-          dung    des     1-Amino-2.5-,dimethyl-4-ch.lorben-          zols    auf     2-Oxynaphtalin-3-carbonsäune-2'.    5'  climetlioxy-1'-anilid erhält.  



       Beispiel:     Die aus 1,56 kg     1-Amina-2.5-dimethyl-          4-chlorbenzol    in üblicher Weise     dargestellte          Diazoverbindung        lä.Bt    man unter Rühren in  eine wässerige Suspension von 3,3 kg 2-Oxy-         nalrhtalin-3-carbonsäure-9_'    .     5'-dimethoxy-1'-          anilid,    bereitet durch Auflösen derselben in  Natronlauge und Wiederausfällen mit ver  dünnter Essigsäure einlaufen. Der Farbstoff  scheidet sich als roter Niederschlag aus. Er  wird filtriert, gewaschen und getrocknet.

   Der  Farbstoff dient zur Erzeugung von sehr gut       chlorechten;        ganz        hervoTria"gend    lichtechten  roten Tönen.



  Process for the preparation of an azo dye. The present invention is a process for the preparation of an azo fa.rerstoffes of the following formula:
EMI0001.0004
    which is obtained by coupling the dia.zo compound of 1-amino-2,5-, dimethyl-4-chlorobenzene to 2-oxynaphthalene-3-carboxylic acid-2 '. 5 'climetlioxy-1'-anilide is obtained.



       Example: The diazo compound, prepared in the usual way from 1.56 kg of 1-amina-2,5-dimethyl-4-chlorobenzene, is poured into an aqueous suspension of 3.3 kg of 2-oxynalrhtalin-3-carboxylic acid-9_ with stirring. '. 5'-dimethoxy-1'-anilide, prepared by dissolving the same in sodium hydroxide solution and reprecipitating with ver dilute acetic acid. The dye separates out as a red precipitate. It is filtered, washed and dried.

   The dye is used to produce very good chlorine rights; very prominent lightfast red tones.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines. Azo- farbstoffes der folgenden Formel: EMI0001.0025 EMI0002.0001 ,dadurch <SEP> gekennzeichnet, <SEP> dass <SEP> man <SEP> die <SEP> Diazo verbindung <SEP> von <SEP> 1-Amino-2.5-dimethyl-4 chlorbenzol <SEP> mit <SEP> 2-Oxynaphta@lin-3-car'bon säure-2' <SEP> . <SEP> 5'-:dimethoxy-l.'-anilid <SEP> kuppelt. EMI0002.0002 Der <SEP> Farbstoff <SEP> .dient <SEP> zur <SEP> E,rzeugun <SEP> ; <SEP> von <tb> sehr <SEP> out <SEP> chlorechten, <SEP> ganz <SEP> hervorragend <tb> lichtechten <SEP> roten; <SEP> Tönten. PATENT CLAIM: Method for representing a. Azo dye of the following formula: EMI0001.0025 EMI0002.0001 , characterized by <SEP>, <SEP> that <SEP> man <SEP> the <SEP> diazo compound <SEP> of <SEP> 1-amino-2.5-dimethyl-4-chlorobenzene <SEP> with <SEP> 2- Oxynaphta @ lin-3-carbonic acid-2 '<SEP>. <SEP> 5 '-: dimethoxy-l .'- anilide <SEP> couples. EMI0002.0002 The <SEP> dye <SEP>. Serves <SEP> for <SEP> E, rzeugun <SEP>; <SEP> from <tb> very <SEP> out <SEP> chlorine rights, <SEP> very <SEP> excellent <tb> lightfast <SEP> red; <SEP> sounded.
CH141780D 1927-10-13 1928-10-11 Process for the preparation of an azo dye. CH141780A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE141780X 1927-10-13
CH139505T 1928-10-11

Publications (1)

Publication Number Publication Date
CH141780A true CH141780A (en) 1930-08-15

Family

ID=25713365

Family Applications (1)

Application Number Title Priority Date Filing Date
CH141780D CH141780A (en) 1927-10-13 1928-10-11 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH141780A (en)

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