CH110109A - Process for the preparation of pure 1-nitro-2-methylanthraquinone. - Google Patents
Process for the preparation of pure 1-nitro-2-methylanthraquinone.Info
- Publication number
- CH110109A CH110109A CH110109DA CH110109A CH 110109 A CH110109 A CH 110109A CH 110109D A CH110109D A CH 110109DA CH 110109 A CH110109 A CH 110109A
- Authority
- CH
- Switzerland
- Prior art keywords
- methylanthraquinone
- nitro
- pure
- preparation
- parts
- Prior art date
Links
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von reinem 1-Nitro-2-methylanthrachinon. Das rohe Nitrometylanthrachinon enthält erhebliche Mengen von fsomeren. Es wurde gefunden, dass das Rohprodukt leicht ge reinigt werden kann, wenn man es mit Salzen der schwefligen Säure längere Zeit in wäs seriger Suspension erhitzt. Dabei wird das 1-Nitro-2-methylanthrachirion nicht verändert, während die Isomeren, von denen bisher zwei wahrscheinlich gemacht werden konnten, als Sulfosäuren in Lösung gehen.
Das gereinigte 1-Niti,o-2-methylanthrachinon gibt mit Schwe felnatrium sofort chemisch reines 1-Amino- 2-methylanthrachinon; die daraus erhaltenen Brom- und andere Derivate sind sehr rein und schmelzen zum Teil 40-50 o höher als bisher angegeben.
<I>Beispiel 1</I> Das aus 1 Teil 2-methylanthrachirion er haltene rohe neutral gewaschene Nitroprodukt wird mit wenig Wasser angeteigt, mit 3 Tei len Natriumsulfit, gelöst in 50 Teilen Wasser, versetzt und fünf Stunden unter Rückfluss gekocht. Hierauf wird heiss abfiltriert und mit heissem Wasser gewaschen. Ausbeute 75-80 % der theoretischen Menge.
<I>Beispiel 2:</I> 111 Teile Methylanthrachinon werden wie üblich nitriert, das feuchte Nitrierungsprodukt in eine wässerige Lösung von 333 Teilen Natriumsulfit in ca. 1800-2000 Teilen Was ser eingetragen und im Autoklaven sechs Stunden auf 110-115o erhitzt. Nach dem "Erkalten wird abgesaugt und reichlich mit kochendem Wasser gewaschen.
Process for the preparation of pure 1-nitro-2-methylanthraquinone. The crude nitromethyl anthraquinone contains significant amounts of fsomers. It has been found that the crude product can be easily purified if it is heated for a long time in aqueous suspension with salts of sulfurous acid. The 1-nitro-2-methylanthrachirione is not changed, while the isomers, of which two could previously be made probable, go into solution as sulfonic acids.
The purified 1-Niti, o-2-methylanthraquinone gives immediately chemically pure 1-amino-2-methylanthraquinone with sulfur sodium; the bromine and other derivatives obtained therefrom are very pure and in some cases melt 40-50 o higher than previously indicated.
<I> Example 1 </I> The crude, neutrally washed nitro product obtained from 1 part of 2-methylanthrachirion is made into a paste with a little water, 3 parts of sodium sulfite dissolved in 50 parts of water are added and the mixture is refluxed for five hours. It is then filtered off while hot and washed with hot water. Yield 75-80% of the theoretical amount.
<I> Example 2: </I> 111 parts of methyl anthraquinone are nitrated as usual, the moist nitration product is added to an aqueous solution of 333 parts of sodium sulfite in approx. 1800-2000 parts of water and heated to 110-115o for six hours in the autoclave. After it has cooled down, it is vacuumed and washed abundantly with boiling water.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE110109X | 1923-08-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH110109A true CH110109A (en) | 1925-05-16 |
Family
ID=5652014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH110109D CH110109A (en) | 1923-08-17 | 1924-07-24 | Process for the preparation of pure 1-nitro-2-methylanthraquinone. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH110109A (en) |
-
1924
- 1924-07-24 CH CH110109D patent/CH110109A/en unknown
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