CH226828A - Process for the preparation of a 5-pyrazolone-4-sulfonic acid. - Google Patents

Process for the preparation of a 5-pyrazolone-4-sulfonic acid.

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Publication number
CH226828A
CH226828A CH226828DA CH226828A CH 226828 A CH226828 A CH 226828A CH 226828D A CH226828D A CH 226828DA CH 226828 A CH226828 A CH 226828A
Authority
CH
Switzerland
Prior art keywords
pyrazolone
sulfonic acid
preparation
methyl
sulfuric acid
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 CH226828A publication Critical patent/CH226828A/en

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

Description

  

      Verfahren        zur    Herstellung einer     5-Pyrazolon-4-sulfonsäure.       Gegenstand vorliegender Erfindung ist  ein Verfahren zur Herstellung von 1-(4'       Sulfophenyl)-3-methyl-5-pyrazolon-4-sulfon-          säure.    Das Verfahren ist dadurch gekenn  zeichnet, dass man     1-Phenyl-3-methyl-5-pyr-          azolon    bei     Wasserbadtemperatur    mit rauchen  der Schwefelsäure behandelt und das     Sulfo-          nierungsgemisch    bei tiefer Temperatur auf  arbeitet.  



  Die neue Verbindung bildet ein Natrium  salz, welches ein grauweisses Pulver darstellt.  Sie ist ein wertvolles     Zwischenprodukt    für  die Herstellung von Farbstoffen.    <I>Beispiel:</I>  17,4 Gewichtsteile     1-Phenyl-3-methyl-5-          pyrazolon    werden in 70 Gewichtsteilen  Schwefelsäure von<B>30%</B>     Anhydridgehalt    un  ter Kühlung eingetragen. Die erhaltene Lö  sung     wird    2 Stunden auf 80-85  (Wasser  badtemperatur) erwärmt. Eine Probe     liefert     dann     sodaalkalisch    mit     Diazobenzollösung     keine     Farbstoffbildung    mehr.

   Das     Sulfonie-          rungsgemisch    wird in Dis eingetragen, Die    erhaltene schwefelsaure Lösung kann mit  Natronlauge unter guter Kühlung neutrali  siert und     eingedampft    werden, wobei sich das  sehr leicht lösliche     Natriumsalz    der 1-(4'       Sulfophenyl)-3-methyl-5-pyrazolon-4-sulfon-          säure    abscheidet, das in getrocknetem Zu  stand ein grauweisses Pulver darstellt.



      Process for the preparation of a 5-pyrazolone-4-sulfonic acid. The present invention relates to a process for the preparation of 1- (4 'sulfophenyl) -3-methyl-5-pyrazolone-4-sulfonic acid. The process is characterized in that 1-phenyl-3-methyl-5-pyrazolone is treated with fumes of sulfuric acid at a water bath temperature and the sulfonation mixture is worked up at a low temperature.



  The new compound forms a sodium salt, which is a gray-white powder. It is a valuable intermediate for the manufacture of dyes. <I> Example: </I> 17.4 parts by weight of 1-phenyl-3-methyl-5-pyrazolone are introduced into 70 parts by weight of sulfuric acid with an anhydride content of <B> 30% </B> under cooling. The solution obtained is heated to 80-85 (water bath temperature) for 2 hours. A sample then produces no more dye formation when alkaline with soda and diazobenzene solution.

   The sulfonation mixture is introduced into Dis. The sulfuric acid solution obtained can be neutralized with sodium hydroxide solution with good cooling and evaporated, the very easily soluble sodium salt of 1- (4 'sulfophenyl) -3-methyl-5-pyrazolone-4 -sulfonic acid separates, which is a gray-white powder when dried.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von 1-(4'-Sulfo- phenyl) - 3 - methyl-5-pyrazolon-4-sulfonsäure, dadurch gekennzeichnet, dass man 1-Phenyl- 3-methyl-5-pyrazolon bei Wasserbadtempera- tur mit rauchender Schwefelsäure behandelt und das Sulfonierungsgemisch bei tiefer Tem peratur aufarbeitet. Die neue Verbindung bildet ein Natrium salz, welches ein grauweisses Pulver darstellt. Sie ist ein wertvolles Zwischenprodukt für die Herstellung von Farbstoffen. PATENT CLAIM: A process for the preparation of 1- (4'-sulfophenyl) -3-methyl-5-pyrazolone-4-sulfonic acid, characterized in that 1-phenyl-3-methyl-5-pyrazolone is mixed with at water bath temperature treated with fuming sulfuric acid and worked up the sulfonation mixture at low temperature. The new compound forms a sodium salt, which is a gray-white powder. It is a valuable intermediate for the manufacture of dyes.
CH226828D 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid. CH226828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH224208T 1941-06-11

Publications (1)

Publication Number Publication Date
CH226828A true CH226828A (en) 1943-04-30

Family

ID=4453428

Family Applications (5)

Application Number Title Priority Date Filing Date
CH226828D CH226828A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.
CH226832D CH226832A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.
CH226830D CH226830A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.
CH226829D CH226829A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.
CH226831D CH226831A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.

Family Applications After (4)

Application Number Title Priority Date Filing Date
CH226832D CH226832A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.
CH226830D CH226830A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.
CH226829D CH226829A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.
CH226831D CH226831A (en) 1941-06-11 1941-06-11 Process for the preparation of a 5-pyrazolone-4-sulfonic acid.

Country Status (1)

Country Link
CH (5) CH226828A (en)

Also Published As

Publication number Publication date
CH226831A (en) 1943-04-30
CH226829A (en) 1943-04-30
CH226830A (en) 1943-04-30
CH226832A (en) 1943-04-30

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