CH300449A - Process for the preparation of an aryl-substituted pyrazoline compound. - Google Patents
Process for the preparation of an aryl-substituted pyrazoline compound.Info
- 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
Links
Landscapes
- 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)
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) |
-
1950
- 1950-06-03 CH CH300449D patent/CH300449A/en unknown
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