CH150161A - Process for the preparation of an arylacetic acid. - Google Patents

Process for the preparation of an arylacetic acid.

Info

Publication number
CH150161A
CH150161A CH150161DA CH150161A CH 150161 A CH150161 A CH 150161A CH 150161D A CH150161D A CH 150161DA CH 150161 A CH150161 A CH 150161A
Authority
CH
Switzerland
Prior art keywords
preparation
acid
acenaphthyl
acetic acid
arylacetic 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 CH150161A publication Critical patent/CH150161A/en

Links

Description

  

  Verfahren zur Darstellung einer     Arylessigsäure.       Gegenstand dieses Zusatzpatentes ist  ein Verfahren zur Darstellung von     Ace-          naphtyl-ä-essigsäure,    welches darin besteht,       dass    man     Acenaphten    und     Monochloressig-          säure    aufeinander einwirken     lässt;    vorzugs  weise nimmt man die Reaktion bei erhöhter  Temperatur vor.  



  <I>Beispiel:</I>       20-0    Gewichtsteile     Acenaphten    werden  mit 250 Gewichtsteilen     Monochloressigsäure     unter Rühren<B>60</B> Stunden lang     auf   <B>175 '</B>  erwärmt. Nach dem Abkühlen zerreibt man  die Masse in kaltem Wasser, saugt ab und  zieht den Rückstand mit etwa 3%iger Na  tronlauge aus. Aus der filtrierten alkalischen  Lösung fällt durch Ansäuern mit verdünn  ter Mineralsäure die     Acenaphtylessigsäure     als graubrauner Niederschlag aus. Man kann       aueli    die Aufarbeitung so vornehmen,     dass     man nach dem Ausziehen mit Wasser den    Rückstand trocknet und mit Äther extra  hiert.

   Nach dem Verdunsten des Äthers wird  die Säure entweder aus     --LUethylalkohol    um  kristallisiert oder im Vakuum destilliert,  wobei sie bei<B>9</B> mm um etwa<B>180'</B>     überaeht     Die     Acenaphtyl-5-essigsäure    kristallisiert  in farblosen Prismen und schmilzt nach vor  herigem Sintern bei<B>187 ' C.</B>  



  Neben dieser als Hauptprodukt erhalte  nen     Acenaphtyl-5-essigsäure    entsteht noch  eine     isomere    Säure von niedrigerem Schmelz  punkt in kleiner Menge. Die Verbindung  soll als Zwischenprodukt für die     Farbstoff-          herstellung    Verwendung finden.



  Process for the preparation of an arylacetic acid. The subject of this additional patent is a process for the preparation of acenaphthyl-a-acetic acid, which consists in allowing acenaphthene and monochloroacetic acid to act on one another; preferably, the reaction is carried out at an elevated temperature.



  <I> Example: </I> 20-0 parts by weight of acenaphthene are heated with 250 parts by weight of monochloroacetic acid while stirring for <B> 60 </B> hours to <B> 175 '</B>. After cooling, the mass is ground in cold water, filtered off with suction and the residue is extracted with about 3% strength sodium hydroxide solution. Acenaphthylacetic acid precipitates out of the filtered alkaline solution as a gray-brown precipitate by acidification with dilute mineral acid. The work-up can also be carried out in such a way that, after being drawn off with water, the residue is dried and extracted with ether.

   After the ether has evaporated, the acid is either recrystallized from --LUethyl alcohol or distilled in vacuo, where it overtakes about <B> 180 '</B> at <B> 9 </B> mm. Acenaphthyl-5-acetic acid crystallizes in colorless prisms and melts at <B> 187 'C. </B> after previous sintering



  In addition to this acenaphthyl-5-acetic acid obtained as the main product, an isomeric acid with a lower melting point is also formed in small quantities. The compound is said to be used as an intermediate for dye production.

Claims (1)

PATENTANSPRUCEI: Verfahren zur Darstellunc von Ace- k5 naphtyl-5-essigsäure, dadurch gekennzeich net, dass man Acenaphten und Monochlor- essigsäure aufeinander einwirken lässt. Die Acenaphtyl-5-essigsäure kristallisiert in farblosen Prismen und schmilzt nach vor herigem Sintern bei<B>187 ' C.</B> UNTERANSPÜUCH: PATENT CLAIM: Process for the preparation of acenaphthyl-5-acetic acid, characterized in that acenaphthene and monochloroacetic acid are allowed to act on one another. The acenaphthyl-5-acetic acid crystallizes in colorless prisms and, after prior sintering, melts at <B> 187 'C. </B> SUBSTANTIAL CLAIM: Verfahren nach Patentansprueh, dadurch gekennzeichnet, dass man die Reaktion bei erhöhter Temperatur a-tisführt. Process according to patent claim, characterized in that the reaction is carried out at an elevated temperature.
CH150161D 1929-02-01 1930-01-23 Process for the preparation of an arylacetic acid. CH150161A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE150161X 1929-02-01
CH146854T 1930-01-23

Publications (1)

Publication Number Publication Date
CH150161A true CH150161A (en) 1931-10-15

Family

ID=25714933

Family Applications (1)

Application Number Title Priority Date Filing Date
CH150161D CH150161A (en) 1929-02-01 1930-01-23 Process for the preparation of an arylacetic acid.

Country Status (1)

Country Link
CH (1) CH150161A (en)

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