CH136546A - Process for the preparation of a descendant of the pyrazolanthrone. - Google Patents

Process for the preparation of a descendant of the pyrazolanthrone.

Info

Publication number
CH136546A
CH136546A CH136546DA CH136546A CH 136546 A CH136546 A CH 136546A CH 136546D A CH136546D A CH 136546DA CH 136546 A CH136546 A CH 136546A
Authority
CH
Switzerland
Prior art keywords
pyrazolanthrone
preparation
chloronitrobenzene
potash
act
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 CH136546A publication Critical patent/CH136546A/en

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

Description

  

  Verfahren zur Darstellung eines     Abkömjnlings    des     Pyrazolanthrons.       Gegenstand dieses Patentes ist ein Verfah  ren zur Darstellung von     Py-I-o-Nitrophenyl-          pyrazolanthron    der Formel  
EMI0001.0005     
    durch     Aufeinandereinwirkenlassen    von     Pyra-          zolantlrron,        o-Chlornitrobenzol    und Pottasche  in Gegenwart einer geringen     Menge    eines       Kupfer-Katalysators    für die Chlorwasserstoff  abspaltung.  



  <I>Beispiel:</I>  45 Gewichtsteile     Pyrazolanthron,    38     (äe-          wichtsteile        o-Chlornitrobenzol    und 30 Gewichts-    teile     wasserfreies        Kaliumkarbonat    werden in  Gegenwart von 2 Gewichtsteilen Kupferkar  bonat und einer Spur Kupferpulver in etwa  400 Gewichtsteilen Nitrobenzol unter Rühren  solange auf Temperaturen um 2001 erhitzt,  bis die Umsetzung beendet ist. Nach den  Erkalten wird abgesaugt, vom Nitrobenzol  durch Waschen mit Alkohol befreit und mit  heissem Wasser zur Entfernung der anorgani  schen Salze nachgewaschen und getrocknet.  Das     Py-1-o-Nitropherrylpyrazolanthron    hinter  bleibt als gelbes Pulver.

   Aus höher siedenden  organischen Lösungsmitteln zum Beispiel  Chlorbenzol kristallisiert es in mikroskopisch  kleinen Prismen vom Schmelzpunkt 246-248  .  In konzentrierter Schwefelsäure löst es sich  mit     gelbstichig    roter Farbe und bräunlicher       Fluorescenz.    Das gleiche Produkt wird erhal  ten, wenn zunächst     Pyrazolanthron    und     Ka-          liumkarbonat    durch Erhitzen in Nitrobenzol  zum Kalisalz des     Pyrazolanthrons    umgesetzt  werden, und dieses dann weiter     unter    den      oben beschriebenen Bedingungen mit     o-Chlor-          nitrobenzol    zur Reaktion gebracht wird.



  Process for the preparation of a descendant of the pyrazolanthrone. The subject of this patent is a procedural ren for the preparation of Py-I-o-nitrophenyl pyrazolanthrone of the formula
EMI0001.0005
    by allowing pyrazolantronone, o-chloronitrobenzene and potash to act on one another in the presence of a small amount of a copper catalyst for the splitting off of hydrogen chloride.



  <I> Example: </I> 45 parts by weight of pyrazolanthrone, 38 parts by weight of o-chloronitrobenzene and 30 parts by weight of anhydrous potassium carbonate are heated to temperatures in the presence of 2 parts by weight of copper carbonate and a trace of copper powder in about 400 parts by weight of nitrobenzene while stirring Heated around 2001 until the reaction has ended. After cooling, the product is filtered off with suction, freed from nitrobenzene by washing with alcohol and washed with hot water to remove the inorganic salts and dried. The py-1-o-nitropherrylpyrazolanthrone remains as a yellow powder .

   From higher-boiling organic solvents, for example chlorobenzene, it crystallizes in microscopic prisms with a melting point of 246-248. It dissolves in concentrated sulfuric acid with a yellowish red color and brownish fluorescence. The same product is obtained if pyrazolanthrone and potassium carbonate are first reacted by heating in nitrobenzene to form the potassium salt of pyrazolanthrone, and this is then further reacted with o-chloronitrobenzene under the conditions described above.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung von Py-1-o- Nitropher)ylpyrazolanthron dadurch gekenn zeichnet, dass man Pyrazolanthron, o-Chlor- nitrobenzol und Pottasche in Gegenwart einer geringen Menge eines Kupfer-Katalysators für die Chlorwasserstoffabspaltung aufeinan der einwirken lässt. Das Produkt bildet ein gelbes Kristallpulver vom Schmelzpunkt 246-248 und löst sich in konzentrierter Schwefelsäure mit gelbstichig-roter Farbe und bräunlicher Fluorescenz. UNTERANSPRVCEE 1. PATENT CLAIM: Process for the preparation of Py-1-o-Nitropher) ylpyrazolanthron characterized in that pyrazolanthrone, o-chloronitrobenzene and potash in the presence of a small amount of a copper catalyst for the elimination of hydrogen chloride is allowed to act on one another. The product forms a yellow crystal powder with a melting point of 246-248 and dissolves in concentrated sulfuric acid with a yellowish-red color and brownish fluorescence. SUBPRVCEE 1. Verfahren nach Patentanspruch dadurch gekennzeichnet, dass man Pyrazolanthron mit Pottasche umsetzt und auf das so erhaltene Kaliumsalz des Pyrazolanthrons o=Chlornitrobenzol einwirken lässt. 2. Verfahren nach Patentanspruch dadurch gekennzeichnet, dass man die Umsetzung in Gegenwart einer kleinen Menge Kupfer salzes bewirkt. Process according to patent claim, characterized in that pyrazole anthrone is reacted with potash and the resulting potassium salt of pyrazole anthrone o = chloronitrobenzene is allowed to act. 2. The method according to claim characterized in that the reaction is effected in the presence of a small amount of copper salt.
CH136546D 1926-10-22 1927-10-22 Process for the preparation of a descendant of the pyrazolanthrone. CH136546A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE136546X 1926-10-22
CH133473T 1927-10-22

Publications (1)

Publication Number Publication Date
CH136546A true CH136546A (en) 1929-11-15

Family

ID=25712071

Family Applications (1)

Application Number Title Priority Date Filing Date
CH136546D CH136546A (en) 1926-10-22 1927-10-22 Process for the preparation of a descendant of the pyrazolanthrone.

Country Status (1)

Country Link
CH (1) CH136546A (en)

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