CH161687A - Process for obtaining a highly concentrated aqueous solution of a salt of 3,5-diiodo-4-pyridone-N-acetic acid. - Google Patents

Process for obtaining a highly concentrated aqueous solution of a salt of 3,5-diiodo-4-pyridone-N-acetic acid.

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Publication number
CH161687A
CH161687A CH161687DA CH161687A CH 161687 A CH161687 A CH 161687A CH 161687D A CH161687D A CH 161687DA CH 161687 A CH161687 A CH 161687A
Authority
CH
Switzerland
Prior art keywords
diiodo
pyridone
acetic acid
salt
highly concentrated
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 CH161687A publication Critical patent/CH161687A/en

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Description

  

  Verfahren zur Gewinnung einer hochkonzentrierten wässerigen Lösung eines Salzes  der     3.5-Dijod-4-pyridon-N-essigsäure.       Die Verwendung der für pharmazeutische  Zwecke, insbesondere für die     röntgenbgra-          phische    Darstellung von Organen im tierischen  Körper, wertvollen     Halogenpyridoncarbon      oder     -sulfonsäuren    begegnet in der Praxis  vielfach infolge der nicht ausreichenden Lös  lichkeit ihrer Metallsalze Schwierigkeiten.  Im besonderen zeigen die     dihalogenierten          Pyridonderivate    im allgemeinen eine derart  geringe Löslichkeit in Wasser, dass ihre prak  tische Verwendung dadurch häufig unmöglich  wird.  



  Es wurde nun gefunden, dass man hoch  konzentrierte     Lösungen    von     Pyridinderivaten     gewinnen kann, wenn man durch zur Salz  bildung befähigte saure Gruppen substituierte       Oxy-        bezw.        Oxohalogenpyridone,    wie die  3.     5-Dijod-4-pyridon-N-essigsäure,    in ihre Salze  mit einem     aliphatischen    Amin umwandelt,  wobei als Lösungsmittel Wasser dient.  



  Gegenstand vorliegender Erfindung ist ein  Verfahren zur Herstellung der hochkonzen  trierten, als Röntgenkontrastmittel verwend  baren Lösung eines Salzes der     3.5-Dijod-4-          pyridon-N-essigsäure,    das dadurch gekenn-    zeichnet ist, dass man die 3.     5-Dijod-4-py        ri-          don-N-essigsäure    in wässerigem Medium mit       Diäthylamin    behandelt.  



  <I>Beispiel:</I>  50,6     gr        3,5-Dijod-4-pyridon-N-essigsäure     werden mit einer Lösung von 10     gr        Diäthyl-          amin    in 60     cm3    Wasser unter Erwärmen in  Lösung gebracht, worauf man die Lösung mit  Wasser auf 100 ein' auffüllt. 100     eins    dieser  Lösung enthalten 60     gr        Diäthylaminsalz        --,     50,6     gr        3.5-Dijod-4-pyridon-N-essigsäure.     



  Dagegen enthalten 100     cms    einer gesät  tigten Lösung des     Natriumsalzes    nur 33     gr          Natriumsalz    = 31,3     gr        3,5-Dijod-4-pyridon-          N-essigsäure.  



  Process for obtaining a highly concentrated aqueous solution of a salt of 3,5-diiodo-4-pyridone-N-acetic acid. The use of halopyridone carbon or sulfonic acids, which are valuable for pharmaceutical purposes, in particular for the X-ray graphical representation of organs in the animal body, often encounters difficulties in practice due to the insufficient solubility of their metal salts. In particular, the dihalogenated pyridone derivatives generally have such a low solubility in water that their practical use is often impossible.



  It has now been found that highly concentrated solutions of pyridine derivatives can be obtained if oxy- or substituted oxy groups capable of salt formation are used. Oxohalopyridones, such as 3. 5-diiodo-4-pyridone-N-acetic acid, are converted into their salts with an aliphatic amine, water being used as the solvent.



  The present invention relates to a process for the preparation of the highly concentrated solution, which can be used as an X-ray contrast medium, of a salt of 3,5-diiodo-4-pyridone-N-acetic acid, which is characterized in that the 3. 5-diiodo-4- treated pyridon-N-acetic acid in an aqueous medium with diethylamine.



  <I> Example: </I> 50.6 g of 3,5-diiodo-4-pyridone-N-acetic acid are brought into solution with a solution of 10 g of diethylamine in 60 cm3 of water while warming, whereupon the solution fill up with water to 100 a '. 100 one of these solutions contain 60 grams of diethylamine salt, 50.6 grams of 3.5-diiodo-4-pyridone-N-acetic acid.



  In contrast, 100 cms of a saturated solution of the sodium salt contains only 33 grams of sodium salt = 31.3 grams of 3,5-diiodo-4-pyridone-N-acetic acid.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Gewinnung einer hochkon zentrierten wässerigen Lösung eines Salzes der 3,5-Dijod-4-pyridon-N-essigsäure, dadurch gekennzeichnet, dass man die 3,5-Dijod-4- pyridon-N-essigsäure in wässerigem Medium mit Diäthplamin behandelt. Claim: Process for obtaining a highly concentrated aqueous solution of a salt of 3,5-diiodo-4-pyridone-N-acetic acid, characterized in that the 3,5-diiodo-4-pyridone-N-acetic acid in an aqueous medium with Diethplamin treated.
CH161687D 1931-10-15 1932-06-02 Process for obtaining a highly concentrated aqueous solution of a salt of 3,5-diiodo-4-pyridone-N-acetic acid. CH161687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE161687X 1931-10-15

Publications (1)

Publication Number Publication Date
CH161687A true CH161687A (en) 1933-05-15

Family

ID=5682240

Family Applications (1)

Application Number Title Priority Date Filing Date
CH161687D CH161687A (en) 1931-10-15 1932-06-02 Process for obtaining a highly concentrated aqueous solution of a salt of 3,5-diiodo-4-pyridone-N-acetic acid.

Country Status (1)

Country Link
CH (1) CH161687A (en)

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