CH156005A - Process for the preparation of 7.8-Benzo-N-methyl-carbazole-3'-oxy-2'-carboxylic acid. - Google Patents
Process for the preparation of 7.8-Benzo-N-methyl-carbazole-3'-oxy-2'-carboxylic acid.Info
- Publication number
- CH156005A CH156005A CH156005DA CH156005A CH 156005 A CH156005 A CH 156005A CH 156005D A CH156005D A CH 156005DA CH 156005 A CH156005 A CH 156005A
- Authority
- CH
- Switzerland
- Prior art keywords
- carboxylic acid
- methyl
- benzo
- carbazole
- oxy
- Prior art date
Links
Landscapes
- Indole Compounds (AREA)
Description
Verfahren zur Darstellung von 7.8-Benzo-N-methyl-carbazol-3'-oxy-2'-carbonsäure. Gegenstand dieses Zusatzpatentes ist ein Verfahren zur Darstellung von 7.8-Benzo- N - methyl - carbazol - 3'- ogy - 2'- carbonsäure, welches dadurch gekennzeichnet ist,
dass man ein Salz der 2.8-Dioxy-naphthalin-3-carbon- säure mit Bisulfit erhitzt und das Reaktions produkt mit N-Methyl-phenylhydrazin in Ge genwart von Mineralsäure weiter erhitzt.
Das so erhaltene Produkt, von gelber Farbe, ist löslich in verdünnter Sodalösung, wenig in Sprit und Eisessig, lässt sich aus Nitrobenzol oder Dichlorbenzol umkristal- lisieren und schmilzt dann bei 310' C. Es soll als Zwischenprodukt zur Herstellung von Farbstoffen Verwendung finden.
<I>Beispiel:</I> 318 Gewichtsteile technische Natrium- bisulfitlauge (= 1 Mol.) werden mit 550 Ge wichtsteilen Wasser verdünnt und mit 131 Gewichtsteilen Natronlauge 40 BA (= 1 Mol) genau neutralisiert und mit 31,8 Gewichts- teilen Natriumbisulfitlauge (als 10 % Über- schuss) versetzt.
Dann rührt man 222 Ge wichtsteile 2. 8 - Dioxynaphthalin - 3 - carbon- säure 92/o (= 1 Mol 100 %) eiu ; die Kar- bonsäure geht dabei in das Natriumsalz über.
Man kocht 6 Stunden unter Rückfluss, säuert durch Zugabe von 145 Gewichtsteilen 60 Schwefelsäure in 800 cm-' Wasser an und gibt 118 Gewichtsteile N-Methylphenyl- hydrazin hinzu. Darauf lässt man bei Siede temperatur 256 Gewichtsteile<B>601</B> Schwefel säure zulaufen und kocht unter Rühren und Rückfluss bis zum Aufhören der S02-Ent- wicklung (etwa 8 Stunden). Man saugt heiss ab, wäscht mit heissem Wasser neutral und erhält nach dem Trocknen 195-205 Ge wichtsteile 7.8-Benzo-N-methylcarbazol-3'- oxy-2'-carbonsäure von gelber Farbe.
Das Produkt ist löslich in verdünnter Sodalösung, wenig in Sprit und Eisessig, lässt sich aus Nitrobenzol oder Dichlorbenzol umkristal- lisieren und schmilzt dann bei<B>310'</B> C. Es hat folgende Konstruktion
EMI0002.0001
Process for the preparation of 7.8-Benzo-N-methyl-carbazole-3'-oxy-2'-carboxylic acid. The subject of this additional patent is a process for the preparation of 7.8-benzo-N-methyl-carbazole-3'-ogy-2'-carboxylic acid, which is characterized by
that a salt of 2,8-dioxynaphthalene-3-carboxylic acid is heated with bisulfite and the reaction product is further heated with N-methylphenylhydrazine in the presence of mineral acid.
The product obtained in this way, of yellow color, is soluble in dilute soda solution, little in spirit and glacial acetic acid, can be recrystallized from nitrobenzene or dichlorobenzene and then melts at 310 ° C. It is said to be used as an intermediate product in the manufacture of dyes.
<I> Example: </I> 318 parts by weight of technical sodium bisulfite liquor (= 1 mol.) Are diluted with 550 parts by weight of water and exactly neutralized with 131 parts by weight of 40 BA sodium hydroxide solution (= 1 mol) and 31.8 parts by weight Sodium bisulfite lye (as a 10% excess) was added.
Then 222 parts by weight of 2.8 - dioxynaphthalene - 3 - carboxylic acid 92 / o (= 1 mol 100%) eiu are stirred; the carboxylic acid is converted into the sodium salt.
The mixture is boiled under reflux for 6 hours, acidified by adding 145 parts by weight of sulfuric acid in 800 cm -1 of water and 118 parts by weight of N-methylphenylhydrazine are added. Then 256 parts by weight <B> 601 </B> sulfuric acid are allowed to run in at the boiling point and the mixture is boiled with stirring and reflux until the evolution of SO2 ceases (about 8 hours). It is filtered off with suction while hot, washed neutral with hot water and, after drying, 195-205 parts by weight of 7.8-benzo-N-methylcarbazole-3'-oxy-2'-carboxylic acid of yellow color.
The product is soluble in dilute soda solution, little in spirits and glacial acetic acid, can be recrystallized from nitrobenzene or dichlorobenzene and then melts at <B> 310 '</B> C. It has the following construction
EMI0002.0001
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE156005X | 1930-03-19 | ||
CH153825T | 1931-03-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH156005A true CH156005A (en) | 1932-07-15 |
Family
ID=25716281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH156005D CH156005A (en) | 1930-03-19 | 1931-03-17 | Process for the preparation of 7.8-Benzo-N-methyl-carbazole-3'-oxy-2'-carboxylic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH156005A (en) |
-
1931
- 1931-03-17 CH CH156005D patent/CH156005A/en unknown
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