CH128993A - Process for the production of a new condensation product of the benzanthrone series. - Google Patents
Process for the production of a new condensation product of the benzanthrone series.Info
- Publication number
- CH128993A CH128993A CH128993DA CH128993A CH 128993 A CH128993 A CH 128993A CH 128993D A CH128993D A CH 128993DA CH 128993 A CH128993 A CH 128993A
- Authority
- CH
- Switzerland
- Prior art keywords
- benzanthrone
- new
- production
- condensation product
- new condensation
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung eines neuen Kondensationsproduktes der Benzanthronreihe. Es wurde gefunden, dass man zu neuen Kondensationsprodukten der Benzanthronreihe gelangt, wenn man Benzanthrone mit aro matischen Oxyverbindungen oder deren Sub- stitutionsprodukten in Gegenwart von Ätz- alkalien auf höhere Temperatur erhitzt.
Um Farbstoffbildung möglichst auszuschliessen, wird der Zusatz von Ätzalkali zweckmässig so bemessen, dass die zur Phenolatbildung erforderliche Menge nicht wesentlich über sehritten wird.
Vorliegendes Patent bezieht sieh auf ein Verfahren zur Herstellung eines neuen Kon densationsproduktes, das dadurch gekenn zeichnet ist, dass man Benzanthron mit P-Naphtol in Gegenwart von Ätzalkalien auf höhere Temperaturen erhitzt.
Die neue Verbindung wird durch Um kristallisieren aus Nitrobenzol in Form glän zender Blättchen erhalten, die sich in Schwefel säure mit roter Farbe ohne Fluoreszenz lösen. Die Verbindung färbt sich bei 260 rot und schmilzt über 300 , sie löst sich in alkoholi- scher Lauge mit roter Farbe. Der neue Körper soll als Zwischenprodukt zur Her stellung von Farbstoffen Verwendung finden. <I>Beispiel:</I> In eine auf 140 erhitzte Schmelze von 20 kg ss-Naphtol und 7,8 kg Ätzkali werden 20 kg Benzanthron eingetragen. Man erhitzt hierauf auf 200 und rührt mehrere Stunden bei dieser Temperatur. Die heisse Schmelze wird dann in Wasser gegossen und das ab geschiedene Reaktionsprodukt abgesaugt.
Die neue Verbindung kann durch Auskochen mit Eisessig von unverändertem Benzanthron be freit werden.
Process for the production of a new condensation product of the benzanthrone series. It has been found that new condensation products of the benzanthrone series are obtained if benzanthrones with aromatic oxy compounds or their substitution products are heated to a higher temperature in the presence of caustic alkalis.
In order to rule out dye formation as far as possible, the addition of caustic alkali is expediently measured in such a way that the amount required for phenolate formation is not significantly exceeded.
The present patent relates to a process for the production of a new condensation product which is characterized in that benzanthrone is heated to higher temperatures with P-naphtol in the presence of caustic alkalis.
The new compound is obtained by recrystallizing from nitrobenzene in the form of shiny platelets that dissolve in sulfuric acid with a red color without fluorescence. The compound turns red at 260 and melts above 300, it dissolves in alcoholic lye with a red color. The new body should be used as an intermediate product for the manufacture of dyes. <I> Example: </I> 20 kg of benzanthrone are added to a melt heated to 140 of 20 kg of ss-naphtol and 7.8 kg of caustic potash. The mixture is then heated to 200 and stirred for several hours at this temperature. The hot melt is then poured into water and the separated reaction product is filtered off with suction.
The new compound can be freed from unchanged benzanthrone by boiling it with glacial acetic acid.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE128993X | 1926-09-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH128993A true CH128993A (en) | 1928-11-16 |
Family
ID=5662834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH128993D CH128993A (en) | 1926-09-04 | 1927-08-23 | Process for the production of a new condensation product of the benzanthrone series. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH128993A (en) |
-
1927
- 1927-08-23 CH CH128993D patent/CH128993A/en unknown
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