DE544621C - Process for the preparation of 2- or 3-oxycarbazole - Google Patents

Process for the preparation of 2- or 3-oxycarbazole

Info

Publication number
DE544621C
DE544621C DEI38562D DEI0038562D DE544621C DE 544621 C DE544621 C DE 544621C DE I38562 D DEI38562 D DE I38562D DE I0038562 D DEI0038562 D DE I0038562D DE 544621 C DE544621 C DE 544621C
Authority
DE
Germany
Prior art keywords
oxycarbazole
preparation
lead oxide
tube
methoxycarbazole
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
Application number
DEI38562D
Other languages
German (de)
Inventor
Dr Fritz Ballauf
Dr Albert Schmelzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI38562D priority Critical patent/DE544621C/en
Application granted granted Critical
Publication of DE544621C publication Critical patent/DE544621C/en
Expired legal-status Critical Current

Links

Description

Verfahren zur Darstellung von 2- bzw. 3-Oxycarbazol Es %vurde gefunden, daß man aus 7- bzw. 6-Alkoxytetrahydrocarbazolen unter Abspaltung der Alkylgruppen zu 2- bzw. 3-Oxycarbazol gelangt, wenn man diese Produkte bei 5oo bis 6oo° mit Bleioxyd behandelt. Dieses Verfahren führt gegenüber der bekannten Einwirkung von Dehydrierungsmitteln auf hydrierte Alkoxycarbazole überraschenderweise direkt zu den entsprechenden Oxyverbindungen und stellt gegenüber den bisher üblichen Herstellungsverfahren für Oxycarbazole einen wesentlichen technischen Fortschritt dar.Process for the preparation of 2- or 3-oxycarbazole It was found that that from 7- or 6-alkoxytetrahydrocarbazoles with elimination of the alkyl groups 2- or 3-oxycarbazole is obtained when these products are mixed with lead oxide at 50 to 600 ° treated. This method leads to the known exposure to dehydrating agents on hydrogenated alkoxycarbazoles surprisingly directly to the corresponding oxy compounds and contrasts with the conventional manufacturing processes for oxycarbazoles represents a significant technical advance.

Das so erhältliche 2- bzw. 3-Okycarbazol soll zur Darstellung von anderen Zwischenprodukten und Farbstoffen Verwendung finden. Beispiel 2o Gewichtsteile 6-Methoxytetrahydrocarbazol werden mit 7o Gewichtsteilen Bleioxyd innig gemischt und in eine Glasröhre eingefüllt; der Rest der Röhre wird dann mit Bieioxydbimssteinstückchen angefüllt. Die Glasröhre wird in eine Messingröhre oder in eine Röhre aus gebranntem Ton geschoben, um so eine gleichmäßige Erhitzung zu erzielen. Bei 5oo bis 6oo° wird die Destillation derart vorgenommen, daß man zuerst das vorgelegte Bleioxydbimssteingemisch gut anheizt und dann die Substanz schnell, zweckmäßig im inerten Gasstrom, wie Kohlensäure oder Stickstoff, über das Bleioxyd destilliert. Das gewonnene Produkt wird in verdünnter Natronlauge gelöst und ausgefällt. Durch Umkristallisieren aus Xylol erhält man das 3-Oxycarbazol in weißen Nadeln vom F. P. 256°. Mit dem in der Literatur beschriebenen 3-Oxycarbazol ist es in jeder Beziehung identisch. Das durch Methylierung nach den üblichen Methoden aus ihm erhaltene 3-Methoxycarbazol kristallisiert aus Alkohol in weißen Nadeln vom F. P. 142'. Es ist ebenfalls mit dem in der Literatur bekannten Methoxycarbazol identisch.The 2- or 3-okycarbazole obtainable in this way is intended to represent other intermediates and dyes are used. Example 2o parts by weight 6-Methoxytetrahydrocarbazole are intimately mixed with 7o parts by weight of lead oxide and filled into a glass tube; the rest of the tube is then covered with bits of bi-oxide pumice filled. The glass tube is put into a brass tube or into a tube made of fired Clay pushed in order to achieve even heating. At 5oo to 6oo ° it becomes the distillation is carried out in such a way that the lead oxide pumice stone mixture is first introduced heats up well and then the substance quickly, expediently in an inert gas stream, such as carbonic acid or nitrogen, distilled over the lead oxide. The product obtained is diluted in Sodium hydroxide solution dissolved and precipitated. Recrystallization from xylene gives the 3-oxycarbazole in white needles from the F. P. 256 °. With the one described in the literature 3-Oxycarbazole is identical in every respect. That by methylation after the 3-Methoxycarbazole obtained from it crystallizes from alcohol using customary methods in white needles from F. P. 142 '. It is also the same as that known in the literature Methoxycarbazole identical.

In analoger Weise kann auch das 2-Oxycarbazol aus dem 7-Äthoxytetrahydrocarbazol erhalten werden.In an analogous manner, 2-oxycarbazole can also be obtained from 7-ethoxytetrahydrocarbazole can be obtained.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung von 2- bzw. 3-Oxycarbazol, dadurch gekennzeichnet, daß man 7- bzw. 6-Alkoxytetrahydrocarbazole bei 5oo bis 6oo° mit Bleioxyd behandelt. Claim: Process for the preparation of 2- or 3-oxycarbazole, characterized in that 7- or 6-alkoxytetrahydrocarbazoles are treated with lead oxide at 500 to 600 °.
DEI38562D 1929-06-30 1929-06-30 Process for the preparation of 2- or 3-oxycarbazole Expired DE544621C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI38562D DE544621C (en) 1929-06-30 1929-06-30 Process for the preparation of 2- or 3-oxycarbazole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI38562D DE544621C (en) 1929-06-30 1929-06-30 Process for the preparation of 2- or 3-oxycarbazole

Publications (1)

Publication Number Publication Date
DE544621C true DE544621C (en) 1932-02-19

Family

ID=7189811

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI38562D Expired DE544621C (en) 1929-06-30 1929-06-30 Process for the preparation of 2- or 3-oxycarbazole

Country Status (1)

Country Link
DE (1) DE544621C (en)

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