CH136550A - 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
- CH136550A CH136550A CH136550DA CH136550A CH 136550 A CH136550 A CH 136550A CH 136550D A CH136550D A CH 136550DA CH 136550 A CH136550 A CH 136550A
- Authority
- CH
- Switzerland
- Prior art keywords
- pyrazolanthrone
- preparation
- bromonaphthalene
- yellow
- potash
- Prior art date
Links
Landscapes
- Nitrogen Condensed Heterocyclic Rings (AREA)
Description
Verfahren zur Darstellung eines Abkömmlings des Pyrazolanthrons. Der Gegenstand der vorliegenden Erfin dung betrifft ein Verfahren zur Darstellung von. Py-l.-a-Naphtylpyrazalanthron der For mel:
EMI0001.0004
durch - Aufeinandereinwirkenlassen von Pyr- azolanthron, a-Bromnaphtalin und Pottasche bei erhöhter Temperatur in. Gegenwart einer geringen Menge eines Kupferkatalysators für die Halogenwasserstoffabspalltung. Das erhaltene Produkt findet zur Herstellung von Küpenfarbstoffen Verwendung.
<I>Beispiel:</I> Gleiche Gewichtsteile Pyrazolanthron und a-Bromnaphtalin werden in etwa der acht fachen Menge Nitrobenzol unter Zusatz der berechneten Menge wasserfreien Ka.lium- karbonats und einer Spur Kupferkarbonat so lange unter R'"cuhren zum Sieden erhitzt, bis die Umsetzung beendet ist.
Nach dem Erkalten wird abgesaugt, mit Äthylalkohol, verdünnter iSalzsäure und heissem Wasser zur Beseitigung des Lösungsmittels und der an- organischen Salze gewaschen und getrocknet.
Das Py-1-a-Napthylpyrazolanthro@n bleibt als gelbbrauner Rückstand, edier erst oberhalb <B>300'</B> schmilzt und sich in, konzentrierter Schwefelsäure mit gelbroter Farbe löst.
Ein Produkt vorn ganz gleichen Eigen schaften; wird erhalten, wenn. zuerst Pyrazol.. anthron und Kaliumkarbonat in Nitrobenzol zusammen erhitzt werden bis sich das rote Kalisalz des Pyrazolanthrons, gebildet hat, und dieses dann unter Einhaltung der oben geschilderten Bedingungen mit a-Brom- naphtaalin zur Umsetzung gebracht wird.
Process for the preparation of a descendant of the pyrazolanthrone. The subject matter of the present invention relates to a method for displaying. Py-l.-a-Naphtylpyrazalanthron of the formula:
EMI0001.0004
by allowing pyrazolanthrone, a-bromonaphthalene and potash to act on one another at an elevated temperature in the presence of a small amount of a copper catalyst for the elimination of hydrogen halide. The product obtained is used for the production of vat dyes.
<I> Example: </I> Equal parts by weight of pyrazolanthrone and α-bromonaphthalene are heated to the boil with about eight times the amount of nitrobenzene with the addition of the calculated amount of anhydrous calcium carbonate and a trace of copper carbonate for as long as possible until the implementation is complete.
After cooling, it is filtered off with suction, washed with ethyl alcohol, dilute hydrochloric acid and hot water to remove the solvent and inorganic salts and dried.
The Py-1-a-Napthylpyrazolanthro @ n remains as a yellow-brown residue, it only melts above <B> 300 '</B> and dissolves in concentrated sulfuric acid with a yellow-red color.
A product with the same properties; is received when. first pyrazole .. anthrone and potassium carbonate are heated together in nitrobenzene until the red potassium salt of pyrazole anthrone has formed, and this is then reacted with α-bromonaphtaalin while observing the conditions described above.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE136550X | 1926-10-22 | ||
CH133473T | 1927-10-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH136550A true CH136550A (en) | 1929-11-15 |
Family
ID=25712075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH136550D CH136550A (en) | 1926-10-22 | 1927-10-22 | Process for the preparation of a descendant of the pyrazolanthrone. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH136550A (en) |
-
1927
- 1927-10-22 CH CH136550D patent/CH136550A/en unknown
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