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CH137949A - Process for the preparation of a halogenated arylthioglycolic acid. - Google Patents

Process for the preparation of a halogenated arylthioglycolic acid.

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Publication number
CH137949A
CH137949A CH137949DA CH137949A CH 137949 A CH137949 A CH 137949A CH 137949D A CH137949D A CH 137949DA CH 137949 A CH137949 A CH 137949A
Authority
CH
Switzerland
Prior art keywords
acid
preparation
trichlorobenzene
halogenated
arylthioglycolic
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 CH137949A publication Critical patent/CH137949A/en

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Description

  

  Verfahren zur Darstellung einer     halogenierten        Arylthioglylzolsäure.       Vorliegendes Patent bezieht sich auf ein  Verfahren zur Darstellung der     1.2.3-Tri-          chlorbenzol-5-thioglykolsäure    der Formel  
EMI0001.0005     
    dadurch gekennzeichnet, dass man     1.2.3-          Trichlorbenzol    - 5 -     sulfosäure        Chlorsulfonsäure     bei Temperaturen unter 100   einwirken  lässt,

   das so erhaltene     1.2.3-Trichlorbenzol-5-          sulfochlorid    zum     Merkaptan    reduziert und  letzteres mit     Monochloressigsäure    konden  siert.  



  Die so erhaltene     1.2.3-Trichlorbenzol-5-          thioglykolsäure    schmilzt in reinem Zustand  bei 136  und soll als Zwischenprodukt zur  Darstellung von Farbstoffen Verwendung  finden.    <I>Beispiel:</I>  145 kg     1.2.3-trichlorbenzol-5-sulfosau-          res    Natrium, hergestellt zum Beispiel aus  der     2.6-Diamino-l-chlorbenzol-4-sulfosäure     durch Ersatz der     Aminogruppen    durch Chlor  nach     Sandmeyer,    werden bei gewöhnlicher  Temperatur in 400 kg     Chlorsulfonsäure    un  ter Rühren eingetragen, hierauf das Gemisch  etwa 1 Stunde bei etwa<B>50'</B> gehalten, ab  gekühlt und auf Eiswasser gegossen.

   Das so  erhaltene     1.2.3-Trichlorbenzol-5-sulfochlorid     wird wie das     Sulfochlorid    im Beispiel des Haupt  patentes zum     Merkaptan    reduziert und letz  teres durch Kondensation mit     Monochloressig-          säure    in die     1.2.3-Trichlorbenzol-5-thioglykol-          säure    vom Schmelzpunkt 136   übergeführt.



  Process for the preparation of a halogenated arylthioglylzolic acid. The present patent relates to a process for the preparation of 1,2.3-trichlorobenzene-5-thioglycolic acid of the formula
EMI0001.0005
    characterized in that 1.2.3- trichlorobenzene - 5 - sulfonic acid chlorosulfonic acid is allowed to act at temperatures below 100,

   the 1,2.3-trichlorobenzene-5-sulfochloride thus obtained is reduced to the mercaptan and the latter is condensed with monochloroacetic acid.



  The 1,2,3-trichlorobenzene-5-thioglycolic acid obtained in this way melts in the pure state at 136 and is said to be used as an intermediate for the preparation of dyes. <I> Example: </I> 145 kg of 1.2.3-trichlorobenzene-5-sulfonic acid sodium, produced for example from 2.6-diamino-1-chlorobenzene-4-sulfonic acid by replacing the amino groups with chlorine according to Sandmeyer added at normal temperature to 400 kg of chlorosulfonic acid with stirring, then the mixture was kept at about 50 for about 1 hour, cooled and poured onto ice water.

   The 1,2,3-trichlorobenzene-5-sulfochloride obtained in this way is reduced to the mercaptan like the sulfochloride in the example of the main patent, and the latter is converted into 1,2,3-trichlorobenzene-5-thioglycolic acid with a melting point of 136 by condensation with monochloroacetic acid .

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung der 1.2.3- Trichlorbenzol-5-thioglykolsäure der Formel EMI0002.0001 dadurch gekennzeichnet, dass man auf 1. 2 . 3- Trichlorbenzol-5-sulfosäure Chlorsulfonsäure bei Temperaturen unter<B>1000</B> einwirken lässt, das so erhaltene 1.2.3-Trichlorbenzol- 5-gulfochlorid zum Merkaptan reduziert und letzteres mit 1Vlonochloressigsäure kondensiert. PATENT CLAIM: Process for the preparation of 1.2.3-trichlorobenzene-5-thioglycolic acid of the formula EMI0002.0001 characterized in that on 1. 2. 3- trichlorobenzene-5-sulfonic acid allows chlorosulfonic acid to act at temperatures below <B> 1000 </B>, the resulting 1,2.3-trichlorobenzene-5-sulfochloride is reduced to mercaptan and the latter is condensed with mononochloroacetic acid. Die so erhaltene 1 . 2 . 3-Trichlorbenzol-5- thioglykolsäure schmilzt in reinem Zustand bei<B>136'</B> und soll als Zwischenprodukt zur Darstellung von Farbstoffen Verwendung finden. The 1. 2. 3-Trichlorobenzene-5-thioglycolic acid melts in the pure state at <B> 136 '</B> and is intended to be used as an intermediate for the preparation of dyes.
CH137949D 1927-03-24 1928-03-17 Process for the preparation of a halogenated arylthioglycolic acid. CH137949A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE137949X 1927-03-24
CH135217T 1928-03-17

Publications (1)

Publication Number Publication Date
CH137949A true CH137949A (en) 1930-01-31

Family

ID=25712462

Family Applications (1)

Application Number Title Priority Date Filing Date
CH137949D CH137949A (en) 1927-03-24 1928-03-17 Process for the preparation of a halogenated arylthioglycolic acid.

Country Status (1)

Country Link
CH (1) CH137949A (en)

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