CH149881A - Process for producing an aminoaldehyde compound. - Google Patents

Process for producing an aminoaldehyde compound.

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Publication number
CH149881A
CH149881A CH149881DA CH149881A CH 149881 A CH149881 A CH 149881A CH 149881D A CH149881D A CH 149881DA CH 149881 A CH149881 A CH 149881A
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CH
Switzerland
Prior art keywords
nitro
producing
compound
chlorobenzaldehyde
acid
Prior art date
Application number
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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.)
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Publication date
Application filed by Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH149881A publication Critical patent/CH149881A/en

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Description

  

  Verfahren zur Herstellung einer     Aminoaldehydverbindung.       Vorliegendes Patent bezieht sich auf ein  Verfahren zur Darstellung von     5-Nitro-          ?-aminobenzaldehyd,    dadurch gekennzeich  net, dass man     5-Nitro-2-chlorbenzaldehyd    mit       einem        Arylsulfosäureamid    durch Erhitzen  unter Zusatz eines säurebindenden Mittels       kondensiert    und aus dem so erhaltenen     5-Ni-          tro-2-arylsulfaminobenzald-ehyd    den     Aryl-          sulforest    durch     Verseifung    abspaltet.  



  Der so erhaltene     5-Nitro-2-aminobenz-          aldehyd    zeigt die in der Literatur beschrie  benen Eigenschaften (vergleiche Chemisches       Zentralblatt    1903, I, S. 921).  



  <I>Beispiel:</I>  Ein Gemisch von 25 kg     5-Nitro-2-chlor-          benzaldehyd,    25 kg     p-Toluolsulfamid,    20 kg  Pottasche, 0,2 kg Kupferpulver und 0,3i kg       Kupferchlorür    wird unter Rühren etwa 3  Stunden auf 170 bis<B>190'</B> erhitzt. Die gelb  gefärbte Schmelze wird alsdann mit Wasser  verdünnt, aufgekocht und filtriert.

   Das    gelbe Filtrat, das die     Toluolsulfaminoverbin-          dung    als     Kaliumsalz    enthält, wird mit ver  dünnter Salzsäure angesäuert, die hierbei als  gelber Niederschlag ausfallende     5-Nitro-2-          p-toluolsulfaminobenzaldehydverbindung    ab  gesaugt und getrocknet. Durch Kristalli  sation aus Eisessig erhält man sie in farb  losen Prismen vom Schmelzpunkt 181 bis  182  , die sich in kalter, verdünnter Natron  lauge, desgleichen in heisser     Sodalösung    mit  gelber Farbe lösen.  



  Das     Phenylhydrazon    kristallisiert aus  Eisessig in gelben Nadeln vom     Schmelzpunkt     214' unter     Zersetzung.     



  Führt man die Reaktion unter Zusatz  von Nitrobenzol, und zwar der etwa vier- bis  sechsfachen Menge des angewandten     5-Nitro-          2-chlorbenzaldehydes    durch, so bleibt die  Schmelze dünnflüssig und nach beendigter  Reaktion wird das Nitrobenzol durch Was  serdampf     abdestilliert.         Die     Verseifung    der     Toluolsulfaminover-          bindung    erfolgt beispielsweise     durch    etwa  halbstündiges Erhitzen mit der sechs- bis  achtfachen Menge 90 bis 95%iger Schwefel  säure auf- 60 bis 80  .



  Process for producing an aminoaldehyde compound. The present patent relates to a process for the preparation of 5-nitro-? -Aminobenzaldehyde, characterized in that 5-nitro-2-chlorobenzaldehyde is condensed with an aryl sulfonic acid amide by heating with the addition of an acid-binding agent and the 5-Ni obtained in this way is condensed - tro-2-arylsulfaminobenzaldehyde splits off the arylsulfo radical by saponification.



  The 5-nitro-2-aminobenzaldehyde obtained in this way shows the properties described in the literature (see Chemisches Zentralblatt 1903, I, p. 921).



  <I> Example: </I> A mixture of 25 kg of 5-nitro-2-chlorobenzaldehyde, 25 kg of p-toluenesulfamide, 20 kg of potash, 0.2 kg of copper powder and 0.3 kg of copper chloride is stirred for about 3 Heated to 170 to <B> 190 '</B> hours. The yellow colored melt is then diluted with water, boiled and filtered.

   The yellow filtrate, which contains the toluenesulfamino compound as the potassium salt, is acidified with dilute hydrochloric acid, and the 5-nitro-2-p-toluenesulfaminobenzaldehyde compound which separates out as a yellow precipitate is sucked off and dried. By crystallization from glacial acetic acid, they are obtained in colorless prisms with a melting point of 181 to 182, which dissolve in cold, dilute caustic soda, as well as in hot soda solution with a yellow color.



  The phenylhydrazone crystallizes from glacial acetic acid in yellow needles with a melting point of 214 'with decomposition.



  If the reaction is carried out with the addition of nitrobenzene, namely about four to six times the amount of the 5-nitro-2-chlorobenzaldehyde used, the melt remains fluid and after the reaction has ended, the nitrobenzene is distilled off by what steam. The saponification of the toluenesulfamino compound takes place, for example, by heating it for about half an hour with six to eight times the amount of 90 to 95% strength sulfuric acid to 60 to 80.

 

Claims (1)

<B>PATENTANSPRUCH:</B> Verfahren zur Darstellung von 5-Nitro- 2-amiiiobenzaI.dehyd, dadurch gekennzeich net, dass man 5-Nitro-2-chlorbenzaldehyd mit einem Arylsulfosäureamid durch Erhitzen unter Zusatz eines säurebindenden Mittels kondensiert und aus dem so erhaltenen 5-Ni- tro-2-a-rylsulfaminobenzaldehyd den Aryl- sulforest durch Verseifung abspaltet. Claim: Process for the preparation of 5-nitro-2-amiiiobenzaI.dehyd, characterized in that 5-nitro-2-chlorobenzaldehyde is condensed with an arylsulfonic acid amide by heating with the addition of an acid-binding agent and from the 5-nitro-2-a-rylsulfaminobenzaldehyde obtained in this way splits off the arylsulfo radical by saponification. Der so erhaltene 5-Nitro-2-aminobenz- ald,ehyd zeigt- die in der Literatur beschrie- benen Eigenschaften (vergleiche Chemisches Zentralblatt 1903, 1, S. 921). The 5-nitro-2-aminobenzaldehyde obtained in this way shows the properties described in the literature (see Chemisches Zentralblatt 1903, 1, p. 921).
CH149881D 1929-02-25 1930-02-19 Process for producing an aminoaldehyde compound. CH149881A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE149881X 1929-02-25
CH146262T 1930-02-19

Publications (1)

Publication Number Publication Date
CH149881A true CH149881A (en) 1931-09-30

Family

ID=25714830

Family Applications (1)

Application Number Title Priority Date Filing Date
CH149881D CH149881A (en) 1929-02-25 1930-02-19 Process for producing an aminoaldehyde compound.

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CH (1) CH149881A (en)

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