CH143276A - Process for the preparation of an isatin derivative - Google Patents

Process for the preparation of an isatin derivative

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Publication number
CH143276A
CH143276A CH143276DA CH143276A CH 143276 A CH143276 A CH 143276A CH 143276D A CH143276D A CH 143276DA CH 143276 A CH143276 A CH 143276A
Authority
CH
Switzerland
Prior art keywords
preparation
isatin derivative
derivative
isatin
weight
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 CH143276A publication Critical patent/CH143276A/en

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Description

  

      Terfahren    zur Darstellung eines     Isatinderivates.            Cxegeiistand    vorliegender Erfindung ist       eiii    Verfahren zur Darstellung eines     Isatin-          derivates,    dadurch gekennzeichnet,     dati    man  ein<B>2'.</B> 4. 5 -     Trimethyl    - 1 -     phenyloxamin-          säiirehalogenid    mit einem kondensierenden  Mittel behandelt.  



       Beispiel     40 Gewichtsteile     Pseudocumidin        (1-Amino-          .    1 . 5 -     trimethylbenzol)    werden in 250     Ge-          -#vichtsteilen        Nitrobenzol    gelöst und über das  salzsaure Salz durch Behandeln mit 44 Ge  wichtsteilen     Otalylchlorid    in das     2.4.5-          "Crimethyl-l-phenyloxaminsäurechlorid    und  Hierauf mit 44 Gewichtsteilen Aluminium  chlorid in das     Isatin    verwandelt.

   Beim     Ein-          (riessen    der Reaktionslösung in verdünnter  Säure scheidet sich das 4 . 5 . 7 -     Trimethyl-          iatin    in     kleinkristallinischer    Form ab und  kann durch scharfes Absaugen von der    Salzsäure     und    dem     Nitrobenzol    getrennt wer  den. Es kristallisiert aus Eisessig zu roten  Nadeln vom Schmelzpunkt 275  . Die Aus  beute beträgt rund 80 % der Theorie.



      To represent an isatin derivative. The subject of the present invention is a process for the preparation of an isatin derivative, characterized in that a <B> 2 '. </B> 4.5-trimethyl-1-phenyloxamine acid halide is treated with a condensing agent.



       Example 40 parts by weight of pseudocumidine (1-amino-. 1.5-trimethylbenzene) are dissolved in 250 parts by weight of nitrobenzene and converted into the 2.4.5- "crimethyl-l-phenyloxamic acid chloride via the hydrochloric acid salt by treating with 44 parts by weight of otalyl chloride and then converted into the isatin with 44 parts by weight of aluminum chloride.

   When the reaction solution is poured into dilute acid, the 4,5,7-trimethylate separates out in small crystalline form and can be separated from the hydrochloric acid and nitrobenzene by sharp suction. It crystallizes from glacial acetic acid to red needles with a melting point 275. The yield is around 80% of theory.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Tsa tiv,- derivates, dadurch gekennzeichnet, dass man ein 2. 4. 5 - Trimethyl - 1 - pheiyle@amin- ,#,ätirehalogenid mit einem kondensierenden Mittel behandelt. Das so erhaltene 4. 5 . 7 -Trimethylisatin kristallisiert aus Eisessig in roten Nadeln vom Schmelzpunkt 275 C. Es soll als Zwi schenprodukt bei der Herstellung von Farb stoffen Verwendung finden. PATENT CLAIM: Process for the preparation of a Tsa tiv, - derivative, characterized in that a 2. 4. 5 - trimethyl - 1 - pheiyle @ amine, #, ätirehalogenid treated with a condensing agent. The 4th 5 thus obtained 7-Trimethylisatin crystallizes from glacial acetic acid in red needles with a melting point of 275 C. It is said to be used as an intermediate product in the manufacture of dyes.
CH143276D 1928-03-27 1929-03-22 Process for the preparation of an isatin derivative CH143276A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE143276X 1928-03-27
CH141530T 1929-03-22

Publications (1)

Publication Number Publication Date
CH143276A true CH143276A (en) 1930-10-31

Family

ID=25713775

Family Applications (1)

Application Number Title Priority Date Filing Date
CH143276D CH143276A (en) 1928-03-27 1929-03-22 Process for the preparation of an isatin derivative

Country Status (1)

Country Link
CH (1) CH143276A (en)

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