CH123102A - Process for the preparation of 1- (4'-sulfophenyl) -5-pyrazolone-3-carboxylic acid methyl ester. - Google Patents

Process for the preparation of 1- (4'-sulfophenyl) -5-pyrazolone-3-carboxylic acid methyl ester.

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Publication number
CH123102A
CH123102A CH123102DA CH123102A CH 123102 A CH123102 A CH 123102A CH 123102D A CH123102D A CH 123102DA CH 123102 A CH123102 A CH 123102A
Authority
CH
Switzerland
Prior art keywords
methyl ester
sulfophenyl
carboxylic acid
acid methyl
pyrazolone
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie Ag
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Filing date
Publication date
Application filed by Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH123102A publication Critical patent/CH123102A/en

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Description

  

  Verfahren zur Darstellung des     1-(4'-Sulfophenyl)-5-pyrazolon-3-karbonsäuremethylesters.       Gegenstand dieses Zusatzpatentes ist ein  Verfahren zur Darstellung des     1-(4'-Sulfo-          phenyl)    - 5 -     pyrazolon    - 3 -     karb        onsäuremethyl-          esters.    Das Verfahren ist dadurch gekenn  zeichnet, dass man das aus     p-Sulf        ophenyl-          hydrazin    und einem Salz des     Oxalessig-          methylesters    erhältliche     Hydrazon    in wässe  riger Lösung erwärmt.  



       Beispiel:     188 Teile     p-Sulfophenylhydrazin    werden  in 1000 Teilen Wasser suspendiert; dazu  setzt man 202 Teile des     Natriumsalzes    des       Oxalessigmethylesters    und lässt etwa eine  Stunde in der     gälte    stehen; dann erhitzt  man das Gemisch langsam zum Sieden; nach  etwa 1 bis 2 Stunden beginnt die Lösung un  ter     Abscheidung    von Kristallen zu stossen.  Dann gibt man soviel Wasser hinzu, dass  wieder     in    der Hitze eine klare Lösung ent  steht und hält noch 1 bis 2 Stunden im Sie  den.

   Beim Erkalten kristallisiert der     Sulfo-          phenylpyrazolonkarbonsäuremethylester    aus;    durch Zusatz von verdünnten Säuren kann  aus der Lauge noch eine weitere Menge an  Ester erhalten werden. Das so erhaltene Pro  dukt kann durch     Umkristallisieren    aus Was  ser gereinigt werden und stellt dann .ein  weisses Pulver dar. Es soll zur Darstellung  von Farbstoffen     dienen.  



  Process for the preparation of 1- (4'-sulfophenyl) -5-pyrazolone-3-carboxylic acid methyl ester. The subject of this additional patent is a process for the preparation of 1- (4'-sulfophenyl) - 5 - pyrazolone - 3 - carbonic acid methyl ester. The process is characterized in that the hydrazone obtainable from p-sulfophenylhydrazine and a salt of the methyl oxaloacetate is heated in an aqueous solution.



       Example: 188 parts of p-sulfophenylhydrazine are suspended in 1000 parts of water; 202 parts of the sodium salt of oxaloacetamethyl ester are added and the mixture is left to stand in the cold for about an hour; then the mixture is slowly heated to boiling; after about 1 to 2 hours the solution begins to collide with the separation of crystals. Then you add enough water that a clear solution is created again in the heat and it stays in the oven for another 1 to 2 hours.

   The methyl sulfophenylpyrazolonecarboxylate crystallizes out on cooling; 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 then represents a white powder. It is intended to be used to represent dyes.

Claims (1)

PATENTANSPRÜOH: Verfahren zur Darstellung des 1-(4'-Sulfo- phenyl) - 5 -pyrazolon - 3 - karbonsäuremethyl- esters, dadurch gekennzeichnet, dass män das aus p-Sulfophenylhydrazin und einem Salz des Oxaless b,-methylester erhältliche Hydra- zon in wässeriger Lösung erwärmt. PATENT APPLICATION: Process for the preparation of the 1- (4'-sulfophenyl) -5-pyrazolone -3-carboxylic acid methyl ester, characterized in that the hydrazone obtainable from p-sulfophenylhydrazine and a salt of oxaless b-methyl ester warmed in aqueous solution. Das Re aktionsprodukt der 1-(4'-Sulfophenyl)-5-pyra- zolo.n - 3 - karbonsäuremethylester stellt ge trocknet ein farbloses Pulver dar, das in Wasser leicht löslich ist und zur Herstellung von Farbstoffen dienen soll. The reaction product of 1- (4'-sulfophenyl) -5-pyrazolo.n-3-carboxylic acid methyl ester is a colorless powder when dried, which is easily soluble in water and is intended to be used for the production of dyes.
CH123102D 1924-11-27 1925-11-24 Process for the preparation of 1- (4'-sulfophenyl) -5-pyrazolone-3-carboxylic acid methyl ester. CH123102A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE123102X 1924-11-27
CH119718T 1925-11-24

Publications (1)

Publication Number Publication Date
CH123102A true CH123102A (en) 1927-10-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CH123102D CH123102A (en) 1924-11-27 1925-11-24 Process for the preparation of 1- (4'-sulfophenyl) -5-pyrazolone-3-carboxylic acid methyl ester.

Country Status (1)

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CH (1) CH123102A (en)

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