CH128120A - Process for the preparation of Bz1-Bz3-dimethylbenzanthrone. - Google Patents

Process for the preparation of Bz1-Bz3-dimethylbenzanthrone.

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Publication number
CH128120A
CH128120A CH128120DA CH128120A CH 128120 A CH128120 A CH 128120A CH 128120D A CH128120D A CH 128120DA CH 128120 A CH128120 A CH 128120A
Authority
CH
Switzerland
Prior art keywords
dimethylbenzanthrone
preparation
anthrone
bzl
weight
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 CH128120A publication Critical patent/CH128120A/en

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

Description

  

  Verfahren zur Darstellung von     Bz1-Bz3-Dimethylbenzanthron.       Gegenstand der vorliegenden Erfindung  ist ein Verfahren zur Darstellung von     $z1-          Bz3-Dimethylbenzanthron,    dadurch gekenn  zeichnet, dass man     Anthron    und     Äthyliden-          aceton    von der folgenden     Formel:     
EMI0001.0008     
    unter Zusatz eines sauren Kondensations  mittels kondensiert.  



  <I>Beispiel:</I>  In ein Gemisch von 50 Gewichtsteilen  Eisessig und 92 Gewichtsteilen Schwefel  säure von 73 % lässt man bei<B>100'</B> eine etwa  70   warme Lösung von 20 Gewichtsteilen       Anthron,    10 Gewichtsteilen     Äthylidenaceton     (dargestellt nach     Claisen;

      Liebigs Annalen  der Chemie, Band 306, Seite     325)        in    50         Gewichtsteile    Eisessig im Laufe einer Stunde       zutropfen    und steigert     dann    die Temperatur  auf<B>110'.</B> Man rührt das Reaktionsgemisch  bei dieser     Temperatur,    bis das     Anthron    gröss  tenteils verschwunden ist,     giesst    auf Eis,  saugt den Niederschlag ab     und    wäscht ihn  neutral. Zur Reinigung     wird        @die    Substanz  mit auf<B>300'</B> überhitztem Wasserdampf de  stilliert.

   Man erhält nach     Ausküpen    von  kleinen     Mengen        Anthrachinon    eine Masse  von brauner Farbe, die aus Methylalkohol  in gelben Nadeln vom .Schmelzpunkt 114  bis 115   kristallisiert. Nach der Entstehung  und der Analyse zu schliessen, liegt das     Bz1-          Bz3-Dimethylbenzanthron    vor. In konzen  trierter Schwefelsäure löst es sich mit roter  Farbe und roter Fluoreszenz.  



  Zu demselben Produkt     gelangt    man, wenn       statt    des     Äthylidenacetons    das     Hydracetyl-          aceton   
EMI0001.0033  
   verwen  det wird, wobei sich unter Wasserabspaltung  primär     Äthylidenaöeton    bildet.



  Process for the preparation of Bz1-Bz3-dimethylbenzanthrone. The present invention relates to a process for the preparation of $ z1- Bz3-dimethylbenzanthrone, characterized in that anthrone and ethylidene acetone of the following formula are used:
EMI0001.0008
    condensed with the addition of an acidic condensation means.



  <I> Example: </I> In a mixture of 50 parts by weight of glacial acetic acid and 92 parts by weight of 73% sulfuric acid, at <B> 100 '</B>, an approx. 70 warm solution of 20 parts by weight of anthrone, 10 parts by weight of ethylidene acetone ( shown after Claisen;

      Liebigs Annalen der Chemie, Volume 306, page 325) is added dropwise in 50 parts by weight of glacial acetic acid over the course of an hour and the temperature is then increased to 110 '. The reaction mixture is stirred at this temperature until the anthrone has largely disappeared is, poured on ice, sucks off the precipitate and washes it neutral. For cleaning, @the substance is distilled with steam superheated to <B> 300 '</B>.

   After purging out small amounts of anthraquinone, a mass of brown color is obtained, which crystallizes from methyl alcohol in yellow needles with a melting point of 114 to 115. According to the formation and the analysis, the Bz1-Bz3-dimethylbenzanthrone is present. In concentrated sulfuric acid it dissolves with a red color and red fluorescence.



  The same product is obtained if hydracetyl acetone is used instead of ethylidene acetone
EMI0001.0033
   is used, whereby primarily Äthylidenaöeton is formed with elimination of water.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung von Bzl-Bz3- Dimethylbenzanthron, dadurch gekennzeich net, dass man Anthron und Ithylidenaceton unter Zusatz eines sauren Kondiensations- mittels kondensiert. Das erhaltene Produkt kristallisiert in gelben Nadeln und schmilzt bei 114 bis 115 . Nach der Entstehung und der Analyse zu schliessen, liegt das Bzl-Bz3-Dimethylbenz- anthron vor. In konzentrierter Schwefel säure löst es sich mit roter Farbe und roter Fluoreszenz. PATENT CLAIM: Process for the preparation of Bzl-Bz3-dimethylbenzanthrone, characterized in that anthrone and ethylidene acetone are condensed with the addition of an acidic condensing agent. The product obtained crystallizes in yellow needles and melts at 114 to 115. According to the formation and the analysis, the Bzl-Bz3-dimethylbenzanthrone is present. It dissolves in concentrated sulfuric acid with a red color and red fluorescence.
CH128120D 1926-04-03 1927-04-02 Process for the preparation of Bz1-Bz3-dimethylbenzanthrone. CH128120A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE128120X 1926-04-03
CH127266T 1927-04-02

Publications (1)

Publication Number Publication Date
CH128120A true CH128120A (en) 1928-10-01

Family

ID=25710836

Family Applications (1)

Application Number Title Priority Date Filing Date
CH128120D CH128120A (en) 1926-04-03 1927-04-02 Process for the preparation of Bz1-Bz3-dimethylbenzanthrone.

Country Status (1)

Country Link
CH (1) CH128120A (en)

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