DE583705C - Process for the preparation of 8-oxyquinoline - Google Patents
Process for the preparation of 8-oxyquinolineInfo
- Publication number
- DE583705C DE583705C DER84751D DER0084751D DE583705C DE 583705 C DE583705 C DE 583705C DE R84751 D DER84751 D DE R84751D DE R0084751 D DER0084751 D DE R0084751D DE 583705 C DE583705 C DE 583705C
- Authority
- DE
- Germany
- Prior art keywords
- oxyquinoline
- preparation
- ethers
- aniline
- ether
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
- C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
- C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D215/20—Oxygen atoms
- C07D215/24—Oxygen atoms attached in position 8
- C07D215/26—Alcohols; Ethers thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Quinoline Compounds (AREA)
Description
Verfahren zur Darstellung von 8-Oxychinolin Es wurde gefunden, daß man mit guter Ausbeute zu 8-Oxychinolin gelangt, wenn man Äther des 8-Oxychinolins durch Erhitzen mit starken anorganischen Säuren in Form ihrer Salze mit aromatischen Basen verseift. Man hat zwar bereits Äther anderer und außerdem durch Alkyl- und Arylreste substituierter Oxychinoline durch Erhitzen mit Salzsäure gespalten, gerade dieser Weg führt jedoch im vorliegenden Fall zu einem vollkommenen Mißerfolg. Um so überraschender ist das ausgezeichnete Ergebnis des oben beschriebenen, bisher nur bei andersartigen Verbindungen bekannten Verfahrens, und zwar um so mehr, als im Hinblick auf die bei der Spaltung stattfindende Bildung beispielsweise von Halogenkohlenwasserstoffen in erster Linie das Entstehen quaternärer Basen zu erwarten war.Process for the preparation of 8-oxyquinoline It has been found that 8-oxyquinoline can be obtained in good yield by using the ether of 8-oxyquinoline by heating with strong inorganic acids in the form of their salts with aromatic ones Saponified bases. One already has ethers of others and also through alkyl and Aryl radicals of substituted oxyquinolines split by heating with hydrochloric acid, straight however, this approach leads to complete failure in the present case. Around so more surprising is the excellent result of the above described, so far only in the case of other types of compounds known method, and all the more so than with regard to the formation of halogenated hydrocarbons, for example, which takes place during the cleavage primarily the formation of quaternary bases was to be expected.
Beispiel Zu einer Mischung von 2 kg 8-Oxychinolinmethyläther mit .gleichen Teilen Anilin wird konzentrierte Salzsäure bis zur kongosauren Reaktion zugesetzt und die Lösung alsdann unter Abdestillieren des Wassers 8 Stunden auf 1700 erhitzt. Nach Erkalten löst man die zähe Schmelze in heißem Wasser, versetzt sie mit NaOH bis zur alkalischen Reaktion und trennt das Gemisch von Anilin und methyliertem Anilin mittels Wasserdampf oder durch Extraktion. Aus der alkalischen Lösung wird in bekannter Weise das 8-Oxychinolin erhalten (Ausbeute etwa 1,7 kg).EXAMPLE Concentrated hydrochloric acid is added to a mixture of 2 kg of 8-oxyquinoline methyl ether with equal parts of aniline until the Congo acidic reaction occurs, and the solution is then heated to 1700 for 8 hours while the water is distilled off. After cooling, the viscous melt is dissolved in hot water, NaOH is added until it has an alkaline reaction and the mixture of aniline and methylated aniline is separated using steam or extraction. The 8-oxyquinoline is obtained from the alkaline solution in a known manner (yield about 1.7 kg).
An Stelle reiner Äther des Oxychinolins kann man auch die bei Anwendung des Skraupschen Verfahrens auf o-Aminophenoläther entstehenden Rohäther in der geschilderten Weise verarbeiten.Instead of pure ethers of oxyquinoline, one can also use the of the Skraup process on o-aminophenol ethers arising crude ethers in the described Process way.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER84751D DE583705C (en) | 1932-04-27 | 1932-04-27 | Process for the preparation of 8-oxyquinoline |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER84751D DE583705C (en) | 1932-04-27 | 1932-04-27 | Process for the preparation of 8-oxyquinoline |
Publications (1)
Publication Number | Publication Date |
---|---|
DE583705C true DE583705C (en) | 1933-09-08 |
Family
ID=7417200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DER84751D Expired DE583705C (en) | 1932-04-27 | 1932-04-27 | Process for the preparation of 8-oxyquinoline |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE583705C (en) |
-
1932
- 1932-04-27 DE DER84751D patent/DE583705C/en not_active Expired
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