CH128900A - Process for the preparation of Bz1-Oxy-Bz2-acetylbenzanthrone. - Google Patents

Process for the preparation of Bz1-Oxy-Bz2-acetylbenzanthrone.

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Publication number
CH128900A
CH128900A CH128900DA CH128900A CH 128900 A CH128900 A CH 128900A CH 128900D A CH128900D A CH 128900DA CH 128900 A CH128900 A CH 128900A
Authority
CH
Switzerland
Prior art keywords
acetylbenzanthrone
preparation
weight
parts
oxy
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 CH128900A publication Critical patent/CH128900A/en

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Description

  

  Verfahren zur Darstellung von     Bz1-Ozy-Bz2-aeetylbenzanthron.       Gegenstand der vorliegenden Erfindung  ist ein Verfahren zur Darstellung des     Bzl-          Oxy-Bz2-acetylbenzanthrons,    dadurch ge  kennzeichnet, dass man     Anthron    und     Äthoxy-          methylenacetessigester    der folgenden Formel:  
EMI0001.0007     
    mit oder ohne Zusatz eines sauren Konden  sationsmittels kondensiert.  



  <I>Beispiele:</I>  1. Zu einer etwa 60   warmen Lösung  von 19,4 Gewichtsteilen     Anthron    in<B>100</B>  Gewichtsteilen Schwefelsäure von 66       B6     und 10 Gewichtsteilen     Wasser    gibt man     lang-          am    eine Auflösung von 20 Gewichtsteilen       .@thoxymethylenacetessigester    in     30'Gewichts-          teilen    Eisessig. Die Lösungsfarbe geht dabei  allmählich von Braungelb über Blauviolett  nach karminrot über.

   Nach kurzem Rühren    bei     etwa    100   gibt man auf Wasser und  reinigt ,das     äusgeschiedene    und     neutral    ge  waschene rohe     Bzl-Ogy-Bz2-acetylbenzan-          thron,    .zunächst zur Entfernung von etwa.

    noch vorhandenem     Anthron        bezw.        Anthra-          chinon    durch Erwärmen mit     Alkalihydr        o-          sulfitlösung,    danach durch     Umkristallisieren     aus einem organischen     Lösungsmittel.    Aus       Nitrobenzol    zum Beispiel kristallisiert es     in     goldgelben Nadeln vom Schmelzpunkt 295  .  In     konzentrierter    Schwefelsäure löst es sich  mit karminroter Farbe und braunroter Fluo  reszenz.

   Aus einer ebenfalls karminroten Lö  sung in wässerigem Alkali kann es mit Säu  ren unverändert wieder ausgefällt werden.  



  2. 100 Gewichtsteile     Anthron    werden mit  100 Gewichtsteilen     Äthoxymethylenacet-          essigester    in     Chinolin    während einer Viertel  stunde unter     Rückfluss    gekocht. Beim Er  kalten kristallisiert das Kondensations  produkt ohne weiteres in goldgelben Nadeln  aus.  



  Es ist identisch mit dem nach Zusatz  patent Nr. 128122 erhaltenen.



  Process for the preparation of Bz1-Ozy-Bz2-aeetylbenzanthron. The present invention relates to a process for the preparation of Bzl-oxy-Bz2-acetylbenzanthrone, characterized in that anthrone and ethoxymethylene acetoacetic ester of the following formula are used:
EMI0001.0007
    condensed with or without the addition of an acidic condensation agent.



  <I> Examples: </I> 1. To an approximately 60 warm solution of 19.4 parts by weight of anthrone in <B> 100 </B> parts by weight of sulfuric acid of 66 B6 and 10 parts by weight of water, a solution of 20 Parts by weight. @ Thoxymethylene acetoacetic ester in 30 parts by weight of glacial acetic acid. The color of the solution gradually changes from brown-yellow to blue-violet to carmine red.

   After brief stirring at about 100, the precipitated and neutrally washed crude Bzl-Ogy-Bz2-acetylbenzanthrone is added to water, first to remove about.

    still existing anthrone respectively. Anthrachinone by heating with an alkali metal hydrosulfite solution, then by recrystallization from an organic solvent. From nitrobenzene, for example, it crystallizes in golden yellow needles with a melting point of 295. It dissolves in concentrated sulfuric acid with a carmine-red color and brown-red fluorescence.

   It can also be reprecipitated unchanged with acids from a carmine-red solution in aqueous alkali.



  2. 100 parts by weight of anthrone are refluxed with 100 parts by weight of ethoxymethylene acetoacetic ester in quinoline for a quarter of an hour. When it is cold, the condensation product readily crystallizes out in golden yellow needles.



  It is identical to the one obtained after additional patent no. 128122.

 

Claims (1)

pATENTANSPRUCg: Verfahren zur Darstellung von Bz1-Ogy- Bz2-acetylbenzanthron, dadurch gekennzeich net, dass man Anthron mit Äthoxymethylen- acetessigsäureester kondensiert. Das erhaltene Produkt kristallisiert in goldgelben Nadeln vom: iSchmelzpunkt 295 . In konzentrierter Schwefelsäure löst es sich mit karminroter Farbe und braunroter Fluo reszenz. APPLICATION FOR THE PATENT: Process for the preparation of Bz1-Ogy-Bz2-acetylbenzanthrone, characterized in that anthrone is condensed with ethoxymethylene acetic acid ester. The product obtained crystallizes in golden-yellow needles with a melting point of 295. It dissolves in concentrated sulfuric acid with a carmine-red color and brown-red fluorescence. ÜNTERANSYRÜC$ Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass die Kondensation unter Zusatz eines sauren Kondensationsmittels durchgeführt wird. ÜNTERANSYRÜC $ method according to claim, characterized in that the condensation is carried out with the addition of an acidic condensation agent.
CH128900D 1926-04-03 1927-04-02 Process for the preparation of Bz1-Oxy-Bz2-acetylbenzanthrone. CH128900A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE128900X 1926-04-03
CH127266T 1927-04-02

Publications (1)

Publication Number Publication Date
CH128900A true CH128900A (en) 1928-11-16

Family

ID=25710846

Family Applications (1)

Application Number Title Priority Date Filing Date
CH128900D CH128900A (en) 1926-04-03 1927-04-02 Process for the preparation of Bz1-Oxy-Bz2-acetylbenzanthrone.

Country Status (1)

Country Link
CH (1) CH128900A (en)

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