CH120707A - Process for the preparation of isodibenzanthrone. - Google Patents
Process for the preparation of isodibenzanthrone.Info
- Publication number
- CH120707A CH120707A CH120707DA CH120707A CH 120707 A CH120707 A CH 120707A CH 120707D A CH120707D A CH 120707DA CH 120707 A CH120707 A CH 120707A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- violet
- isodibenzanthrone
- bzl
- turns
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellüng von Isodibenzantluon. Gegenstand dieses Patentes ist ein Ver fahren zur Darstellung von Isodibenzanthron.
Das Verfahren besteht darin, dass man Bzl - pari - Thiokresylbenzanthron folgender Formel:
EMI0001.0006
mit alkalischen Kondensationsmitteln, insbe sondere alkoholischem Ätzalkali, behandelt.
<I>Beispiel</I> In eine Schmelze von äthylalkoholischem Kali, hergestellt durch Erhitzen von 80 Ge wichtsteilen Kalihydrat und 80 Gewichts teilen Äthylalkohol auf 135 unter Ab destillieren des überschüssigen Alkohols trägt man bei 135 bis 140' 20 Gewichtsteile Bzl- p-Thiokresylbenzanthron, erhältlich ziem Bei spiel durch Erhitzen von Bzl-Chlorbenz- Thiokresol und Kalihydrat in alkoholischer Lösung, ein und rührt die Schmelze eine. Stunde bei 140 bis 145'.
Nach dieser Zeit verdünnt man mit Wasser, leitet in die,Sus- pension Luft ein, solange noch Farbstoff in: Form der Leukoverbindung in Lösung ist, filtriert und wäscht mit Wasser gut aus. Der erhaltene Farbstoff ist Isodibenzanthron, welches praktisch vollständig frei von Di- benzanthron ist. Er stellt ein dunkelviolettes Pulver dar, das sich in konzentrierter Schwe felsäure mit rein grüner Farbe löst und Baumwolle aus blauvioletter Hydrosulfitküpe rotstickig violett färbt.
An Stelle von. Äthylalkohol kann man auch andere Alkohole, an Stelle von Kali hydrat andere Ätzalkalien verwenden.
Process for the preparation of isodibenzantluon. The subject of this patent is a process for the preparation of isodibenzanthrone.
The procedure consists of getting Bzl - pari - thiocresylbenzanthrone of the following formula:
EMI0001.0006
treated with alkaline condensing agents, in particular special alcoholic caustic alkali.
<I> Example </I> In a melt of ethyl alcoholic potash, produced by heating 80 parts by weight of potassium hydrate and 80 parts by weight of ethyl alcohol to 135 while distilling off the excess alcohol, 20 parts by weight of Bzl- p-thiocresylbenzanthrone are carried at 135 to 140 , obtainable for example by heating Bzl-chlorobenz-thiocresol and potassium hydrate in alcoholic solution, and stirs the melt. Hour at 140 to 145 '.
After this time, it is diluted with water, air is passed into the suspension as long as there is still dye in the form of the leuco compound in solution, filtered and washed thoroughly with water. The dye obtained is isodibenzanthrone, which is practically completely free from dibenzanthrone. It is a dark violet powder that dissolves in concentrated sulfuric acid with a pure green color and turns cotton from a blue-violet hydrosulfite vat into a red-embroidered violet.
Instead of. Ethyl alcohol can also be used with other alcohols or other caustic alkalis instead of potash hydrate.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE120707X | 1924-10-20 | ||
| CH119233T | 1927-12-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH120707A true CH120707A (en) | 1927-06-16 |
Family
ID=25709232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH120707D CH120707A (en) | 1924-10-20 | 1925-10-19 | Process for the preparation of isodibenzanthrone. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH120707A (en) |
-
1925
- 1925-10-19 CH CH120707D patent/CH120707A/en unknown
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