CH177819A - Process for the preparation of 4-trifluoromethyl-2-aminophenylmethylsulfone. - Google Patents

Process for the preparation of 4-trifluoromethyl-2-aminophenylmethylsulfone.

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Publication number
CH177819A
CH177819A CH177819DA CH177819A CH 177819 A CH177819 A CH 177819A CH 177819D A CH177819D A CH 177819DA CH 177819 A CH177819 A CH 177819A
Authority
CH
Switzerland
Prior art keywords
trifluoromethyl
weight
parts
aminophenylmethylsulfone
preparation
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 CH177819A publication Critical patent/CH177819A/en

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Description

  

  Verfahren zur Herstellung des     4-Triünormethyl-2-aminophenylmethylsulfons:       Gegenstand des vorliegenden Zusatzpa  tentes ist ein Verfahren zur Herstellung des       4-Trifluormethyl-2-amirrophenylmethylsulfons,     welches dadurch gekennzeichnet ist, dass man  ein Salz der     4-Trifluormethyl-2-nitrophenyl-          sulfonylessigsäure    durch Erhitzen in wässe  riger, schwach alkalischer Lösung in das  4 -     Trifluormethyl    - 2 -     nitrophenyl        methylsulfon     überführt und dieses reduziert.  



  Die so erhaltene Verbindung soll als  Zwischenprodukt für die Herstellung von       Farbstoffen    Verwendung finden.    scheidet sich bereits beim Kochen in kristal  liner Form ab. Nach Beendigung der Reak  tion lässt man erkalten, saugt ab und wäscht  mit Wasser nach. Man erhält in sehr guter  Ausbeute das     4-Trifluorrnetliyl-2-nitrophenyl-          methyIsulfon    vom Schmelzpunkt     150-1510    C.  



  Durch Reduktion nach den üblichen Me  thoden wird daraus das bisher nicht bekannte  4 -     Trifluormethyl-2-aminopheny        lmethylsulfon     vom Schmelzpunkt 94-95   C hergestellt.



  Process for the production of 4-trifluoromethyl-2-aminophenylmethylsulfone: The subject of the present additional patent is a process for the production of 4-trifluoromethyl-2-amirrophenylmethylsulfone, which is characterized in that a salt of 4-trifluoromethyl-2-nitrophenylsulfonyl acetic acid is used converted into 4 - trifluoromethyl - 2 - nitrophenyl methylsulfone by heating in an aqueous, weakly alkaline solution and this reduced.



  The compound thus obtained is said to be used as an intermediate for the production of dyes. separates out in a crystalline form during cooking. After the reaction has ended, the mixture is allowed to cool, suction filtered and washed with water. The 4-trifluoromethyl-2-nitrophenylmethyl sulfone with a melting point of 150-1510 ° C. is obtained in very good yield.



  The previously unknown 4-trifluoromethyl-2-aminophenylmethylsulfone with a melting point of 94-95 ° C. is produced therefrom by reduction according to the usual methods.

Claims (1)

<B>PATENTANSPRUCH:</B> <I>Beispiel:</I> 313 Gewichtsteile 4-Trifluormethyl-2-nitro- phenylsulfonylessigsäure vom Schmelzpunkt 156-1570C werden mit 63 Gewichtsteilen wasserfreiem Natriumkarbonat in 700 Ge wichtsteilen Wasser gelöst und am Rückfluss- kühler zum Sieden erhitzt. <B> PATENT CLAIM: </B> <I> Example: </I> 313 parts by weight of 4-trifluoromethyl-2-nitro-phenylsulfonylacetic acid with a melting point of 156-1570C are dissolved with 63 parts by weight of anhydrous sodium carbonate in 700 parts by weight of water and refluxed cooler heated to the boil. Das neue Produkt Verfahren zur Herstellung des 4-Trifluor- methyl-2-aminophenylmethylsulfons, dadurch gekennzeichnet, dass man ein Salz der 4-Tri- fluormethyl - 2 - rritrophenylsulfor)ylessigsäure durch Erhitzen in wässeriger, schwach alka lischer Lösung in das 4-Trifluormetbyl-2- nitrophenylmethylsulfon überführt und dieses reduziert. Die so erhaltene, bisher nicht bekannte Verbindung, schmilzt bei 94-95' C. The new product Process for the preparation of 4-trifluoromethyl-2-aminophenylmethylsulfone, characterized in that a salt of 4-trifluoromethyl-2-rritrophenylsulfor) ylacetic acid is converted into 4-trifluoromethyl by heating in an aqueous, weakly alkaline solution -2- nitrophenylmethyl sulfone transferred and this reduced. The compound obtained in this way, previously unknown, melts at 94-95 ° C. UNTERANSPRUCH: Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man das Natriumsalz der 4 - Trifluormethyl - 2 - nitrophenylsulfonyl - essigsäure anwendet. SUBSTANTIAL CLAIM: Process according to patent claim, characterized in that the sodium salt of 4 - trifluoromethyl - 2 - nitrophenylsulfonyl acetic acid is used.
CH177819D 1932-08-24 1933-08-07 Process for the preparation of 4-trifluoromethyl-2-aminophenylmethylsulfone. CH177819A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE177819X 1932-08-24
CH172361T 1933-08-07

Publications (1)

Publication Number Publication Date
CH177819A true CH177819A (en) 1935-06-15

Family

ID=25719174

Family Applications (1)

Application Number Title Priority Date Filing Date
CH177819D CH177819A (en) 1932-08-24 1933-08-07 Process for the preparation of 4-trifluoromethyl-2-aminophenylmethylsulfone.

Country Status (1)

Country Link
CH (1) CH177819A (en)

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