CH136548A - Process for the preparation of a descendant of the pyrazolanthrone. - Google Patents
Process for the preparation of a descendant of the pyrazolanthrone.Info
- Publication number
- CH136548A CH136548A CH136548DA CH136548A CH 136548 A CH136548 A CH 136548A CH 136548D A CH136548D A CH 136548DA CH 136548 A CH136548 A CH 136548A
- Authority
- CH
- Switzerland
- Prior art keywords
- acid
- preparation
- pyl
- orange
- solution
- Prior art date
Links
Landscapes
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
Description
Verfahren zur Darstellung eines Abkömmlings des Pyrazolanthrons. Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Darstellung von Pyl- Plienyipz-razola.ntbron-o-ca.rbonsäure von der Formel
EMI0001.0006
durch Kondensation von Pyrazolantkron mit o-Ifalogenbenzoesätire in Gegenwart eines säurebindenden Mittels. Die Reaktion kann unter Zusatz von geringen Mengen K'u.pfer- verbindungen als
Katalysatoren ausgeführt werden.
Das neue Produkt stellt ein wertvolles Zwischenprodukt zur Herstellung v cn Farb- stoffen dar. <I>Beispiel</I> In 100 G.T. Amylalkohol werden 11 G.T. Pyrazoauthran, 10 G.
T. o-Brombenzoesäure. 10 G. T. wasserfreies Kaliumacetat, 0,5 G. T. Kupferacetat nud eine Spur Kupfer verrührt. die Mischung langsam zum Sieden erhitzt und etwa. 12 Stunden hindurch im Sieden ge halten.
Nach Zusatz von Wasser und Soda, wird der Amylalkohol mit Wasserdampf ab getrieben, die dunkelgelbe Lösung des Na triumsalzes von ungelöst gebliebenen Teiler etwa. nicht umgesetzten Pyrazo.lanthrons fil triert, und aus dem Filtrat die Phenylpyr- azo1 anthron-o-ca,rbonsäure als gelber Nieder- schlag gefällt.
Aus Eisessig kristallisiert sie in kleinen, gelben Kriställchen, die bei 262 bis 265 schmelzen, in verdünnter Sodalösuii,g löst sie sich bereits in der Kälte leicht mit. gelber Farbe. Die Lösungsfarbe in cone. Schwefelsäure ist ora-ge mit schwacher gelblicher Fluoreszenz, in Chlorsulfonsäure zunächst ebenfalls orange, verändert sich aber nach wenigen Augenblicken und, schlägt schliesslich nach Grün um.
An Stelle der o-Prombenzoesäure kann mit gleichem Erfolge die o-Chlorbenz..o.esäure zur Umsetzung mit Pyrazolanthron gebracht werden.
Process for the preparation of a descendant of the pyrazolanthrone. The present invention relates to a process for the preparation of Pyl-Plienyipz-razola.ntbron-o-ca.rboxylic acid of the formula
EMI0001.0006
by condensation of Pyrazolantkron with o-Ifalogenbenzoesätire in the presence of an acid-binding agent. The reaction can be carried out with the addition of small amounts of K'u.pfer- compounds as
Catalysts are running.
The new product represents a valuable intermediate product for the production of dyes. <I> Example </I> In 100 G.T. Amyl alcohol is 11 G.T. Pyrazoauthran, 10 G.
T. o-bromobenzoic acid. 10 G. T. anhydrous potassium acetate, 0.5 G. T. copper acetate and a trace of copper stirred. the mixture slowly heated to the boil and about. Keep boiling for 12 hours.
After adding water and soda, the amyl alcohol is driven off with steam, the dark yellow solution of the sodium salt of the undissolved divider, for example. unreacted pyrazolanthrone is filtered, and the phenylpyrazo1 anthrone-o-carboxylic acid is precipitated from the filtrate as a yellow precipitate.
From glacial acetic acid it crystallizes in small, yellow crystals, which melt at 262 to 265, in dilute soda solution, g it dissolves easily even in the cold. yellow color. The solution color in cone. Sulfuric acid is orange with a weak yellowish fluorescence, in chlorosulfonic acid also initially orange, but changes after a few moments and finally turns green.
In place of the o-prombenzoic acid, the o-chlorobenzic acid can be reacted with pyrazolanthrone with the same success.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE136548X | 1926-10-22 | ||
CH133473T | 1927-10-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH136548A true CH136548A (en) | 1929-11-15 |
Family
ID=25712073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH136548D CH136548A (en) | 1926-10-22 | 1927-10-22 | Process for the preparation of a descendant of the pyrazolanthrone. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH136548A (en) |
-
1927
- 1927-10-22 CH CH136548D patent/CH136548A/en unknown
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