CH281971A - Process for the preparation of a dye intermediate. - Google Patents

Process for the preparation of a dye intermediate.

Info

Publication number
CH281971A
CH281971A CH281971DA CH281971A CH 281971 A CH281971 A CH 281971A CH 281971D A CH281971D A CH 281971DA CH 281971 A CH281971 A CH 281971A
Authority
CH
Switzerland
Prior art keywords
dye intermediate
preparation
isodibenzanthrone
sulfuric acid
water
Prior art date
Application number
Other languages
German (de)
Inventor
Limited Imperial Ch Industries
Original Assignee
Ici Ltd
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 Ici Ltd filed Critical Ici Ltd
Publication of CH281971A publication Critical patent/CH281971A/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
    • C09B3/00—Dyes with an anthracene nucleus condensed with one or more carbocyclic rings
    • C09B3/22—Dibenzanthrones; Isodibenzanthrones
    • C09B3/30—Preparation from starting materials already containing the dibenzanthrone or isodibenzanthrone nucleus

Landscapes

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

Description

  

      Zusatzpatent    zum Hauptpatent     Nr.-    267390.    Verfahren zur Herstellung eines     Farbstoffzwischenproduktes.       Gegenstand der vorliegenden Erfindung  ist ein Verfahren zur Herstellung von     Bis-          (ehlormethyl)-isodibenzanthron,    welches da  durch gekennzeichnet ist, dass     Isodibenz-          ant.hron    mit einer Substanz, welche die Chlor  methylgruppe einzuführen vermag, in Gegen  wart eines Kondensationsmittels behandelt  wird.  



  Das neue Produkt ist ein violettes Pulver,  welches in     Wasser    unlöslich ist und in     konz.     Schwefelsäure eine grüne Lösung liefert..  



  Als Substanz, welche die     Chlormethyl-          gruppe    einzuführen vermag, sei beispielsweise  genannt     Dichlordimethyläther,    welcher     ge-          wünsehtenfalls    in sitze aus     Paraformaldehyd     und Halogenwasserstoff gebildet werden kann.  



  Als sich eignendes Kondensationsmittel sei  beispielsweise Schwefelsäure oder Aluminium  chlorid genannt.  



  <I>Beispiel:</I>  20 Teile     Isodibenzanthron    werden unter  Rühren in 330 Teilen 100     o/oiger    Schwefel-    säure bei 20 bis 25  C gelöst und mit 65 Teilen       Dichlordimethyläther    versetzt. Das Gemisch  wird dann innerhalb einer Stunde auf 60  C  erwärmt und während sechs Stunden bei die  ser Temperatur von 60  C gerührt. Das     chlor-          methylierte    Produkt wird durch Eingiessen  des Reaktionsgemisches in ein Gemisch von  Eis und Wasser ausgefällt, filtriert, mit kal  tem. Wasser gewaschen und getrocknet.



      Additional patent to main patent no. 267390. Process for the preparation of a dye intermediate. The present invention relates to a process for the production of bis (ehlomethyl) isodibenzanthrone, which is characterized in that isodibenzant.hron is treated with a substance which is able to introduce the chloromethyl group in the presence of a condensation agent.



  The new product is a purple powder, which is insoluble in water and in conc. Sulfuric acid provides a green solution ..



  An example of a substance which the chloromethyl group is able to introduce is dichlorodimethyl ether, which, if desired, can be formed from paraformaldehyde and hydrogen halide.



  Examples of suitable condensing agents are sulfuric acid or aluminum chloride.



  <I> Example: </I> 20 parts of isodibenzanthrone are dissolved in 330 parts of 100% sulfuric acid at 20 to 25 ° C. with stirring, and 65 parts of dichlorodimethyl ether are added. The mixture is then heated to 60 ° C. over the course of one hour and stirred at this temperature of 60 ° C. for six hours. The chloromethylated product is precipitated by pouring the reaction mixture into a mixture of ice and water, filtered, with cold tem. Water washed and dried.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Farbstoff zwischenproduktes, nämlich des Bis-(chlor- methyl)-isodibenzanthrons, dadurch gekenn zeichnet, dass Isodibenzanthron mit einer Sub stanz, welche die Chlormethylgruppe einzu führen vermag, in Gegenwart eines Konden sationsmittels behandelt wird. Das neue Produkt ist ein violettes Pulver, welches in Wasser unlöslich ist und in konz. Schwefelsäure eine grüne Lösung liefert. PATENT CLAIM: Process for the production of a dye intermediate product, namely bis- (chloromethyl) -isodibenzanthrone, characterized in that isodibenzanthrone is treated in the presence of a condensation agent with a substance which can introduce the chloromethyl group. The new product is a purple powder, which is insoluble in water and in conc. Sulfuric acid gives a green solution.
CH281971D 1946-05-27 1947-05-27 Process for the preparation of a dye intermediate. CH281971A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB281971X 1946-05-27
CH267390T 1947-05-27

Publications (1)

Publication Number Publication Date
CH281971A true CH281971A (en) 1952-03-31

Family

ID=25730952

Family Applications (1)

Application Number Title Priority Date Filing Date
CH281971D CH281971A (en) 1946-05-27 1947-05-27 Process for the preparation of a dye intermediate.

Country Status (1)

Country Link
CH (1) CH281971A (en)

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