CH300449A - Process for the preparation of an aryl-substituted pyrazoline compound. - Google Patents

Process for the preparation of an aryl-substituted pyrazoline compound.

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Publication number
CH300449A
CH300449A CH300449DA CH300449A CH 300449 A CH300449 A CH 300449A CH 300449D A CH300449D A CH 300449DA CH 300449 A CH300449 A CH 300449A
Authority
CH
Switzerland
Prior art keywords
aryl
preparation
substituted pyrazoline
pyrazoline compound
compound
Prior art date
Application number
Other languages
German (de)
Inventor
Limited Ilford
Original Assignee
Ilford 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 Ilford Ltd filed Critical Ilford Ltd
Publication of CH300449A publication Critical patent/CH300449A/en

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  • Plural Heterocyclic Compounds (AREA)

Description

  

  Verfahren zur Herstellung einer     arylsubstituierten        Pyrazolinverhindung.       Im Hauptpatent ist ein Verfahren zur Her  stellung einer     arylsiibstitriierten        Pyrazolin-          v        erbindung    beschrieben, welches dadurch ge  kennzeichnet ist, dass man eine den Rest  
EMI0001.0007     
    abgebende     Verbindung    mit     Phenylhydrazin-          p-sulfonsärire    kondensiert.

   Als zur Abgabe  dieses Restes geeignete Verbindungen werden       Benzalacetophenon        und    seine     Dialkylamino-          Additionsverbindungen    genannt.  



  Gegenstand des vorliegenden Patentes ist  gleichfalls ein Verfahren zur Herstellung  einer     arylsubstituierten        Pyrazolinverbindung,     bei welchem aber eine den Rest  
EMI0001.0017     
    abgebende Verbindung mit     Phenylhydrazin-          p-sulfonsäure    kondensiert wird.  



  <I>Beispiel:</I>  5,5 Teile     Phenylhydrazin-p-sulfoxisäure          (86,6o/oig)    werden zu 150 Teilen Wasser ge  geben     und        Natriumhydroxydlösung    hinzuge  fügt, bis die     Sulfonsäure    in Lösung gegangen  ist. 8 Teile     p'-Sulfo-chalkon,    hergestellt nach  bekannten Verfahren aus     Benzaldehyd    und         Acetophenon-p-sulfonsäure,    werden zu der  Lösung gegeben     und    darauf bei 90-100  im  Lauf einer halben Stunde noch 50 Teile  Essigsäure     (20o/oig).    Die Mischung wird  unter     Rückflusskühlung    während 3 Stunden  gekocht.

   Nach beendeter Reaktion wird die  Lösung zur Trockne eingedampft und der  Rückstand mit Methanol ausgezogen. Die     me-          thanolische        Lösung        wird    auf ein kleines Vo  lumen eingedampft, worauf das     1,3-Di-(p-          sLllfophenyl)-5-phenyl-pyrazolin    mit Äther  ausgefällt,     abfiltriert    und getrocknet wird.  Es stellt ein gelbes, fein kristallines Pulver  dar.  



  Die neue     Verbindung,    das     1,3-Di-(p-sulfo-          pheiiyl)-5-phenyl-pyrazolin,    soll als     Aufhel-          lungsmittel    benutzt werden.



  Process for the preparation of an aryl-substituted pyrazoline compound. In the main patent, a process for the preparation of an arylsiibstitriierte Pyrazoline- ver connection is described, which is characterized in that one of the rest
EMI0001.0007
    donating compound condensed with phenylhydrazine p-sulfonic acid.

   Benzalacetophenone and its dialkylamino addition compounds are mentioned as compounds suitable for releasing this residue.



  The present patent also relates to a process for the preparation of an aryl-substituted pyrazoline compound, in which, however, one is the remainder
EMI0001.0017
    donating compound is condensed with phenylhydrazine p-sulfonic acid.



  <I> Example: </I> 5.5 parts of phenylhydrazine-p-sulfoxic acid (86.6%) are added to 150 parts of water and sodium hydroxide solution is added until the sulfonic acid has dissolved. 8 parts of p'-sulfo-chalcone, prepared by known processes from benzaldehyde and acetophenone-p-sulfonic acid, are added to the solution and then at 90-100 in the course of half an hour 50 parts of acetic acid (20%). The mixture is refluxed for 3 hours.

   After the reaction has ended, the solution is evaporated to dryness and the residue is extracted with methanol. The methanolic solution is evaporated to a small volume, whereupon the 1,3-di- (p-sLllfophenyl) -5-phenyl-pyrazoline is precipitated with ether, filtered off and dried. It is a yellow, finely crystalline powder.



  The new compound, 1,3-di- (p-sulfopheiiyl) -5-phenyl-pyrazoline, is said to be used as a lightening agent.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung einer arylsub- stituierten Pyr azoliriverbindLuig, dadurch ge kennzeichnet, dass man eine den Rest EMI0001.0047 abgebende Verbindung mit Phenylhydrazin-p- sulfonsäure kondensiert. Die neue Verbindung, das 1,3-Di-(p-sulfo- phenyl)-5-phenyl-pyrazolin, stellt ein gelbes, fein kristallines Pulver dar. PATENT CLAIM: Process for the production of an aryl-substituted PyrazoliriverbindLuig, characterized in that one the rest EMI0001.0047 donating compound condensed with phenylhydrazine-p-sulfonic acid. The new compound, 1,3-di- (p-sulfophenyl) -5-phenyl-pyrazoline, is a yellow, finely crystalline powder.
CH300449D 1950-06-03 1950-06-03 Process for the preparation of an aryl-substituted pyrazoline compound. CH300449A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH293111T 1950-06-03
CH300449T 1950-06-03

Publications (1)

Publication Number Publication Date
CH300449A true CH300449A (en) 1954-07-31

Family

ID=25733329

Family Applications (1)

Application Number Title Priority Date Filing Date
CH300449D CH300449A (en) 1950-06-03 1950-06-03 Process for the preparation of an aryl-substituted pyrazoline compound.

Country Status (1)

Country Link
CH (1) CH300449A (en)

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