CH123103A - Process for the preparation of the 1- (3'-sulfophenyl) -5-pyrazolone-3-carboxylic acid ethyl ester. - Google Patents

Process for the preparation of the 1- (3'-sulfophenyl) -5-pyrazolone-3-carboxylic acid ethyl ester.

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Publication number
CH123103A
CH123103A CH123103DA CH123103A CH 123103 A CH123103 A CH 123103A CH 123103D A CH123103D A CH 123103DA CH 123103 A CH123103 A CH 123103A
Authority
CH
Switzerland
Prior art keywords
sulfophenyl
pyrazolone
carboxylic acid
ethyl ester
acid ethyl
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 CH123103A publication Critical patent/CH123103A/en

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Description

  

  Verfahren zur Darstellung des     1-(3'-Sulfophenyl)-6-pyrazolon-3-karbonsäureäthylesters.       Gegenstand dieses Zusatzpatentes ist ein  Verfahren zur Darstellung des     1-(3'-Sulfo-          phenyl)    - 5 -     pyrazolon    - 3 -     karbonsäureäthyl-          esters.    Das Verfahren ist dadurch gekenn  zeichnet, dass man das aus     meta-Sulfophenyl-          hydnazin    und einem Salz des     Oxalessigäthyl-          esters    erhältliche     Hydra.zon    in wässeriger  Lösung erwärmt.  



  <I>Beispiel:</I>  188 Teile     meta-Sulfophenylhydrazin    wer=  den in 1000 Teilen Wasser suspendiert; dazu  setzt man 230 Teile des     Natriumsalzes    des       Oxalessigäthylesters    und lässt etwa 1 Stunde  in der Kälte stehen; dann erhitzt man das  Gemisch langsam zum     Sieden;    nach etwa  1 bis 2 Stunden beginnt die Lösung unter Ab  scheidung von Kristallen zu stossen. Dann  gibt man soviel Wasser hinzu, dass wieder in  der Hitze eine klare Lösung entsteht und  hält noch 1 bis 2 Stunden im Sieden.

   Beim  Erkalten kristallisiert der     Sulf        ophenylpyra-          zolonkarbonsäureäthylester    aus; durch Zu-    Satz von verdünnten Säuren kann aus der  Lauge noch eine weitere Menge an Ester er  halten werden. Das so erhaltene Produkt kann  durch     Umkristallisieren    aus Wasser gereinigt  werden und stellt dann ein weisses Pulver dar.  Es soll zur Darstellung von Farbstoffen die  nen. -



  Process for the preparation of the 1- (3'-sulfophenyl) -6-pyrazolone-3-carboxylic acid ethyl ester. The subject of this additional patent is a process for the preparation of 1- (3'-sulfophenyl) -5-pyrazolone-3-carboxylic acid ethyl ester. The process is characterized in that the hydra.zone obtainable from meta-sulfophenylhydnazine and a salt of oxaloacetic ethyl ester is heated in an aqueous solution.



  <I> Example: </I> 188 parts of meta-sulfophenylhydrazine are suspended in 1000 parts of water; 230 parts of the sodium salt of the ethyl oxaloacetate are added and the mixture is left to stand in the cold for about 1 hour; then the mixture is slowly heated to boiling; after about 1 to 2 hours, the solution begins to poke with separation of crystals. Then add enough water that a clear solution is formed again in the heat and it is kept boiling for 1 to 2 hours.

   On cooling, the ethyl sulfophenylpyrazolonecarboxylate crystallizes out; by adding dilute acids, a further amount of ester can be obtained from the lye. The product obtained in this way can be purified by recrystallization from water and is then a white powder. It is intended to be used to represent dyes. -

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung des 1-(3'-Sulfo- phenyl) - 5 - pyrazolon - 3 - karbonsäureäthyl- 'esters, dadurch gekennzeichnet, dass man das aus meta-Sulfophenylhydrazin und einem Salz des Oxalessigäthylesters erhältliche Ily- ,drazon in wässeriger Lösung erwärmt. Das Reaktionsprodukt .der 1-(3'-Sulfophenyl)-5- pyrazolon-3-karbonsäureäthylester stellt ge trocknet ein farbloses Pulver dar, PATENT CLAIM: A process for the preparation of 1- (3'-sulfophenyl) - 5 - pyrazolone - 3 - carboxylic acid ethyl 'ester, characterized in that the Ily-, drazon obtained from meta-sulfophenylhydrazine and a salt of oxaloacetic ethyl ester in aqueous Solution heated. The reaction product of the 1- (3'-sulfophenyl) -5-pyrazolone-3-carboxylic acid ethyl ester is a colorless powder when dried. das in Was ser leicht löslich ist und zur Herstellung von Farbstoffen dienen soll. which is easily soluble in what water and is intended to be used for the production of dyes.
CH123103D 1924-11-27 1925-11-24 Process for the preparation of the 1- (3'-sulfophenyl) -5-pyrazolone-3-carboxylic acid ethyl ester. CH123103A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE123103X 1924-11-27
CH119718T 1925-11-24

Publications (1)

Publication Number Publication Date
CH123103A true CH123103A (en) 1927-10-17

Family

ID=25709309

Family Applications (1)

Application Number Title Priority Date Filing Date
CH123103D CH123103A (en) 1924-11-27 1925-11-24 Process for the preparation of the 1- (3'-sulfophenyl) -5-pyrazolone-3-carboxylic acid ethyl ester.

Country Status (1)

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CH (1) CH123103A (en)

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