CH152768A - Process for the preparation of 3-oxycarbazole. - Google Patents
Process for the preparation of 3-oxycarbazole.Info
- Publication number
- CH152768A CH152768A CH152768DA CH152768A CH 152768 A CH152768 A CH 152768A CH 152768D A CH152768D A CH 152768DA CH 152768 A CH152768 A CH 152768A
- Authority
- CH
- Switzerland
- Prior art keywords
- oxycarbazole
- preparation
- lead oxide
- tube
- methoxytetrahydrocarbazole
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung von 3-Oxycarbazol. Es wurde gefunden, dass man aus 6 Methoxytetrahydrocarbazol unter Abspaltung der Alkylgruppe zu 3-Oxycarbazol gelangt, wenn man dieses Produkt bei 400-600' mit Bleioxyd behandelt.
Dieses Verfahren führt gegenüber der bekannten Einwirkung von Dehydrieru ngsmitteln auf hydrierte Alkoxy- carbazole überraschenderweise direkt zu der entsprechenden Oxyverbindung und stellt ge genüber den bisher üblichen Herstellungsver fahren für Oxycarbazole einen wesentlichen technischen Fortschritt dar.
Das so erhältliche 3-Oxycarbazol soll zur Darstellung von andern Zwischenprodukten und Farbstoffen Verwendung finden.
<I>Beispiel:</I> 20 Cxewichtsteile 6-'Methoxytetrahydrocar- bazol wurden mit 70 Gewichtsteilen Bleioxyd innig gemischt und in eine Glasröhre einge- füllt; der Rest der Röhre wurde dann mit Bleioxyd-Bimssteinstückchen angefüllt. Die Glasröhre wurde in eine Messingröhre oder in eine Röhre aus gebranntem Ton geschoben, um so eine gleichmässige Erhitzung zu er zielen.
Bei 400-600 wurde die Destillation derart vorgenommen, dass man zuerst das vorgelegte Bleioxyd-Bimssteingemisch gut an heizte und dann die Substanz schnell, zweck mässig im inerten Gasstrom, wie Kohlensäure oder Stickstoff, über das Bleioxyd destilliert. Das gewonnene Produkt wird in verdünnter Natronlauge gelöst und ausgefällt. Durch Um kristallisieren aus gylol erhält man das 3- Oxycarbazol in weissen Nadeln vom F.<B>2560.</B> Mit dem in der Literatur beschriebenen 3- Oxycarbazol ist es in jeder Beziehung iden tisch.
Das durch Methylierung nach den üb lichen Methoden aus ihm erhaltene 3-Methoxy- earbazol kristallisiert aus Alkohol in weissen Nadeln vom F. 142 _ Es ist ebenfalls mit dem in der Literatur bekannten Methoxycar- bazol identisch.
Process for the preparation of 3-oxycarbazole. It has been found that methoxytetrahydrocarbazole is converted to 3-oxycarbazole with elimination of the alkyl group if this product is treated with lead oxide at 400-600 '.
Compared to the known action of dehydrogenating agents on hydrogenated alkoxycarbazoles, this process surprisingly leads directly to the corresponding oxy compound and represents a significant technical advance compared to the conventional manufacturing processes for oxycarbazoles.
The 3-oxycarbazole obtainable in this way is said to be used for the preparation of other intermediate products and dyes.
<I> Example: </I> 20 parts by weight of 6-methoxytetrahydrocarbazole were intimately mixed with 70 parts by weight of lead oxide and poured into a glass tube; the rest of the tube was then filled with bits of lead oxide pumice stone. The glass tube was pushed into a brass tube or into a tube made of baked clay in order to achieve even heating.
At 400-600 the distillation was carried out in such a way that the lead oxide-pumice stone mixture was first heated thoroughly and the substance was then quickly distilled over the lead oxide, conveniently in an inert gas stream, such as carbonic acid or nitrogen. The product obtained is dissolved in dilute sodium hydroxide solution and precipitated. By recrystallizing from glycol, the 3-oxycarbazole is obtained in white needles from F. <B> 2560 </B> It is identical in every respect to the 3-oxycarbazole described in the literature.
The 3-methoxy-earbazole obtained from it by methylation according to the usual methods crystallizes from alcohol in white needles of F. 142 _ It is also identical to the methoxycarbazole known in the literature.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE152768X | 1929-06-29 | ||
| CH149699T | 1930-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH152768A true CH152768A (en) | 1932-02-15 |
Family
ID=25715471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH152768D CH152768A (en) | 1929-06-29 | 1930-06-28 | Process for the preparation of 3-oxycarbazole. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH152768A (en) |
-
1930
- 1930-06-28 CH CH152768D patent/CH152768A/en unknown
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