CH128900A - Process for the preparation of Bz1-Oxy-Bz2-acetylbenzanthrone. - Google Patents
Process for the preparation of Bz1-Oxy-Bz2-acetylbenzanthrone.Info
- Publication number
- CH128900A CH128900A CH128900DA CH128900A CH 128900 A CH128900 A CH 128900A CH 128900D A CH128900D A CH 128900DA CH 128900 A CH128900 A CH 128900A
- Authority
- CH
- Switzerland
- Prior art keywords
- acetylbenzanthrone
- preparation
- weight
- parts
- oxy
- Prior art date
Links
Landscapes
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
Verfahren zur Darstellung von Bz1-Ozy-Bz2-aeetylbenzanthron. Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Darstellung des Bzl- Oxy-Bz2-acetylbenzanthrons, dadurch ge kennzeichnet, dass man Anthron und Äthoxy- methylenacetessigester der folgenden Formel:
EMI0001.0007
mit oder ohne Zusatz eines sauren Konden sationsmittels kondensiert.
<I>Beispiele:</I> 1. Zu einer etwa 60 warmen Lösung von 19,4 Gewichtsteilen Anthron in<B>100</B> Gewichtsteilen Schwefelsäure von 66 B6 und 10 Gewichtsteilen Wasser gibt man lang- am eine Auflösung von 20 Gewichtsteilen .@thoxymethylenacetessigester in 30'Gewichts- teilen Eisessig. Die Lösungsfarbe geht dabei allmählich von Braungelb über Blauviolett nach karminrot über.
Nach kurzem Rühren bei etwa 100 gibt man auf Wasser und reinigt ,das äusgeschiedene und neutral ge waschene rohe Bzl-Ogy-Bz2-acetylbenzan- thron, .zunächst zur Entfernung von etwa.
noch vorhandenem Anthron bezw. Anthra- chinon durch Erwärmen mit Alkalihydr o- sulfitlösung, danach durch Umkristallisieren aus einem organischen Lösungsmittel. Aus Nitrobenzol zum Beispiel kristallisiert es in goldgelben Nadeln vom Schmelzpunkt 295 . In konzentrierter Schwefelsäure löst es sich mit karminroter Farbe und braunroter Fluo reszenz.
Aus einer ebenfalls karminroten Lö sung in wässerigem Alkali kann es mit Säu ren unverändert wieder ausgefällt werden.
2. 100 Gewichtsteile Anthron werden mit 100 Gewichtsteilen Äthoxymethylenacet- essigester in Chinolin während einer Viertel stunde unter Rückfluss gekocht. Beim Er kalten kristallisiert das Kondensations produkt ohne weiteres in goldgelben Nadeln aus.
Es ist identisch mit dem nach Zusatz patent Nr. 128122 erhaltenen.
Process for the preparation of Bz1-Ozy-Bz2-aeetylbenzanthron. The present invention relates to a process for the preparation of Bzl-oxy-Bz2-acetylbenzanthrone, characterized in that anthrone and ethoxymethylene acetoacetic ester of the following formula are used:
EMI0001.0007
condensed with or without the addition of an acidic condensation agent.
<I> Examples: </I> 1. To an approximately 60 warm solution of 19.4 parts by weight of anthrone in <B> 100 </B> parts by weight of sulfuric acid of 66 B6 and 10 parts by weight of water, a solution of 20 Parts by weight. @ Thoxymethylene acetoacetic ester in 30 parts by weight of glacial acetic acid. The color of the solution gradually changes from brown-yellow to blue-violet to carmine red.
After brief stirring at about 100, the precipitated and neutrally washed crude Bzl-Ogy-Bz2-acetylbenzanthrone is added to water, first to remove about.
still existing anthrone respectively. Anthrachinone by heating with an alkali metal hydrosulfite solution, then by recrystallization from an organic solvent. From nitrobenzene, for example, it crystallizes in golden yellow needles with a melting point of 295. It dissolves in concentrated sulfuric acid with a carmine-red color and brown-red fluorescence.
It can also be reprecipitated unchanged with acids from a carmine-red solution in aqueous alkali.
2. 100 parts by weight of anthrone are refluxed with 100 parts by weight of ethoxymethylene acetoacetic ester in quinoline for a quarter of an hour. When it is cold, the condensation product readily crystallizes out in golden yellow needles.
It is identical to the one obtained after additional patent no. 128122.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE128900X | 1926-04-03 | ||
| CH127266T | 1927-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH128900A true CH128900A (en) | 1928-11-16 |
Family
ID=25710846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH128900D CH128900A (en) | 1926-04-03 | 1927-04-02 | Process for the preparation of Bz1-Oxy-Bz2-acetylbenzanthrone. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH128900A (en) |
-
1927
- 1927-04-02 CH CH128900D patent/CH128900A/en unknown
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