CH282261A - Process for the preparation of a monoazo dye. - Google Patents

Process for the preparation of a monoazo dye.

Info

Publication number
CH282261A
CH282261A CH282261DA CH282261A CH 282261 A CH282261 A CH 282261A CH 282261D A CH282261D A CH 282261DA CH 282261 A CH282261 A CH 282261A
Authority
CH
Switzerland
Prior art keywords
monoazo dye
preparation
oxybenzene
acetylamino
nitro
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 CH282261A publication Critical patent/CH282261A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B45/00—Complex metal compounds of azo dyes
    • C09B45/02—Preparation from dyes containing in o-position a hydroxy group and in o'-position hydroxy, alkoxy, carboxyl, amino or keto groups
    • C09B45/14—Monoazo compounds
    • C09B45/16—Monoazo compounds containing chromium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Verfahren zur Herstellung eines     Monoazofarbstoffes.       Es wurde gefunden, dass man zu einem  wertvollen     Monoazofarbstoff    gelangt, wenn  man     diazotiertes        4-Nitro-6-acetylamino-2-          amino-l-oxybenzol    in alkalischem Medium mit       2,7-Dioxynaplithalin    vereinigt.  



  Der neue Farbstoff löst sich in heissem  Wasser und verdünnter heisser     Natriumcarbo-          natlösung    mit     braunstichig    bordeauxroter, in  konzentrierter Schwefelsäure mit reiner violet  ter Farbe und färbt Wolle nach dem     Nach-          chromier-    und     Einbadchromierverfahren    in  echten     violettstiehig    braunen Tönen.  



  Die     Diazotierung    des     4-Nitro-6-acetylamino-          2-amino-l-oxybenzols    kann nach üblichen an  sich bekannten Methoden, z. B. mit Hilfe von  Mineralsäure, insbesondere Salzsäure und Na  triumnitrit, durchgeführt werden.  



  Die Kupplung wird in neutralem bis     alkali-          sehem,    vorzugsweise in alkalischem Medium,  z. B. in     alkalicarbonatalkalisehem,        alkali-          hydroxydalkalischem    oder     erdalkalihydroxyd-          alkalischem    Medium vorgenommen.  



  <I>Beispiel:</I>  21,1 Teile     4-Nitro-6-acetylamino-2-amino-l-          oxybenzol    werden in 100 Teilen Wasser auf  geschlämmt und nach Zugabe von 20 Teilen    30     o/oiger    Salzsäure und Eis bei 5 bis 10  mit  25     Volumteilen        4n-Natriumnitritlösung    in üb  licher Weise     diazotiert.    Die Suspension der       Diazoverbindung    wird durch Zugabe von     Na-          triumcarbonat    neutralisiert und hierauf fil  triert.

   Der erhaltene Filterkuchen wird in die  durch Eiszugabe auf etwa 0  abgekühlte Lö  sung von 16,8 Teilen     2,7-Dioxynaphthalin    in  70     Volumteilen    2n     NaOH    eingetragen. Man  rührt bei 5 bis 10 , bis die Kupplung beendet  ist, filtriert und wäscht mit verdünnter Koch  salzlösung nach.



  Process for the preparation of a monoazo dye. It has been found that a valuable monoazo dye is obtained when diazotized 4-nitro-6-acetylamino-2-amino-1-oxybenzene is combined with 2,7-dioxynaplithalin in an alkaline medium.



  The new dye dissolves in hot water and a dilute hot sodium carbonate solution with a brownish claret, in concentrated sulfuric acid with a pure violet color and dyes wool in real violet-tinged brown shades using the post-chrome and single-bath chrome-plating process.



  The diazotization of 4-nitro-6-acetylamino-2-amino-1-oxybenzene can be carried out by conventional methods known per se, e.g. B. with the help of mineral acid, especially hydrochloric acid and Na trium nitrite, are carried out.



  The coupling is carried out in a neutral to alkaline medium, preferably in an alkaline medium, e.g. B. made in alkalicarbonatalkalisehem, alkali hydroxydalkalischem or alkaline earth hydroxide alkaline medium.



  <I> Example: </I> 21.1 parts of 4-nitro-6-acetylamino-2-amino-l-oxybenzene are suspended in 100 parts of water and, after the addition of 20 parts of 30% hydrochloric acid and ice, at 5% Diazotized up to 10 with 25 parts by volume of 4N sodium nitrite solution in the usual way. The suspension of the diazo compound is neutralized by adding sodium carbonate and then filtered.

   The filter cake obtained is introduced into the solution, cooled to about 0 by the addition of ice, of 16.8 parts of 2,7-dioxynaphthalene in 70 parts by volume of 2N NaOH. The mixture is stirred at 5 to 10 until the coupling is complete, filtered and washed with dilute sodium chloride solution.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Monoazo- farbstoffes, dadurch gekennzeichnet, dass man diazotiertes 4 - Nitro - 6-acetylamino-2-amino-l- oxybenzol in alkalischem Medium mit 2,7-Di- oxynaphthalin vereinigt. PATENT CLAIM: A process for the production of a monoazo dye, characterized in that diazotized 4-nitro-6-acetylamino-2-amino-l-oxybenzene is combined with 2,7-dioxynaphthalene in an alkaline medium. Der neue Farbstoff löst sich in heissere Wasser und verdünnter heisser Natriumcarbo- natlösung mit braunstichig bordeauxroter, in konzentrierter Schwefelsäure mit reiner vio letter Farbe und färbt Wolle nach dem Nach- ehromier- und Einbadchromierverfahren in echten violettstichig braunen Tönen. The new dye dissolves in hot water and a dilute, hot sodium carbonate solution with a brownish burgundy tint, in concentrated sulfuric acid with a pure violet color and dyes wool in true purple-tinged brown tones using the follow-up toming and single-bath chrome-plating process.
CH282261D 1948-09-03 1948-09-03 Process for the preparation of a monoazo dye. CH282261A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH279910T 1948-09-03
CH282261T 1948-09-03

Publications (1)

Publication Number Publication Date
CH282261A true CH282261A (en) 1952-04-15

Family

ID=25731956

Family Applications (1)

Application Number Title Priority Date Filing Date
CH282261D CH282261A (en) 1948-09-03 1948-09-03 Process for the preparation of a monoazo dye.

Country Status (1)

Country Link
CH (1) CH282261A (en)

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