CH192153A - Process for the preparation of 4-nitro-2-amino-1-oxynaphthalene-8-sulfonic acid. - Google Patents
Process for the preparation of 4-nitro-2-amino-1-oxynaphthalene-8-sulfonic acid.Info
- Publication number
- CH192153A CH192153A CH192153DA CH192153A CH 192153 A CH192153 A CH 192153A CH 192153D A CH192153D A CH 192153DA CH 192153 A CH192153 A CH 192153A
- Authority
- CH
- Switzerland
- Prior art keywords
- sulfonic acid
- nitro
- amino
- oxynaphthalene
- solution
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/02—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof
- C07C303/22—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof from sulfonic acids, by reactions not involving the formation of sulfo or halosulfonyl groups; from sulfonic halides by reactions not involving the formation of halosulfonyl groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von 4-Nitro-2-amino-l-oxynaphthalin-8-sulfonsäure. Es wurde .gefunden, dass 4-Nitro-2-amino- 1 - oxynaphthalin - 8 - sulfonsäure hergestellt werden kann, wenn man 2,4-Dinitro-l-ogy- naphthalin-8-sulfons-äure mit sauerstofffreien Schwefelverbindungen ,der Erdalka_limetalle reduziert.
Die neue 4-Nitro-2-amino-l-ogynaphtha- lin-8-sulfonsäure wird bei vorsichtiger Trock nung in Form eines bräunlichgelben Pulvers erhalten.
In kaltem Wasser ist sie sehr schwerlöslich; die Suspension geht beim. Er- wärmen mit oranger Farbe in. Lösung. In 10 % iger Sodalösung,
sowie in 10 % iger Na tronlauge löst sie sich leicht mit rotoranger und in konzentrierter Schwefelsäure mit gel- ber Farbe.
Als sauerstofffreieSchwefelverbindungen der Erda.lkalimetalle kommen zum Beispiel Cal-ciumsulfhydrat oder Magnesiumsulfid in Betracht. Die Reduktion wird zweckmässig in wässerigem Medium durchgeführt.
Die 4-Nitro-2-amino-l-oxynaphthalin-8- sulfonsäure kann so in sehr guter Ausbeute erhalten werden; sie stellt ein wertvolles Zwischenprodukt für die Herstellung von Farbstoffen,dar.
<I>Beispiel:</I> ,336 Teile 2,4-,dinitro-l-ogynaphthalin-8- suUonsaures Natrium werden mit 2000 Tei len kaltem Wasser verrührt. Inzwischen mischt man eine kalte Lösung von 720 Tei len kristallisiertem ,Schwefelnatrium in 1500 Teilen Wasser mit einer Lösung von 500 Teilen kristallisiertem Magnesiumchlorid in 1000 Teilen Wasser,
wobei sich Magnesium- sulfid bildet, und. lässt die entstandene dünn breiige Masse in,die ,
Suspension der Dinitro- verhindung einlaufen. Man erwärmt unter Rühren auf 40' und hält zwei Stunden bei 40 bis<B>-50'.</B> Hierauf wird die tief braunrot gefärbte Lösung mit Salzsäure angesäuert und nach dem Erkalten die 4-Nitro,
2-amino- 1-ogynaphthalin-8-sulfonsäure und Schwefel abfiltriert. Zur Isolierung der reinen Säure teigt man die -Suspension in. kaltem Wasser an, fügt Natronlauge bis zur schwach alka- lischen Reaktion hinzu und filtriert, mög- liehst unter Luftabschluss, in schwach ver dünnte Salzsäure,
wobei sich die 4-Nitro-2- amino-l-ogynaphthalin-8-sulfonsäure abschei det. Sie wird filtriert, mit Wasser gewaschen und getrocknet.
Process for the preparation of 4-nitro-2-amino-1-oxynaphthalene-8-sulfonic acid. It was found that 4-nitro-2-amino-1-oxynaphthalene-8-sulfonic acid can be produced by using 2,4-dinitro-1-ogynaphthalene-8-sulfonic acid with oxygen-free sulfur compounds, the alkaline earth metals reduced.
The new 4-nitro-2-amino-1-ogynaphthalin-8-sulfonic acid is obtained in the form of a brownish-yellow powder after careful drying.
It is very sparingly soluble in cold water; the suspension goes with. Warm with orange color in solution. In 10% soda solution,
as well as in 10% sodium hydroxide solution, it dissolves easily with red-orange and in concentrated sulfuric acid with a yellow color.
Calcium sulfhydrate or magnesium sulfide, for example, can be considered as oxygen-free sulfur compounds of the alkaline earth metals. The reduction is expediently carried out in an aqueous medium.
The 4-nitro-2-amino-1-oxynaphthalene-8-sulfonic acid can thus be obtained in very good yield; it is a valuable intermediate product for the manufacture of dyes.
<I> Example: </I>, 336 parts of 2,4-, dinitro-l-ogynaphthalene-8-suUonsaures sodium are stirred with 2000 parts of cold water. In the meantime, mix a cold solution of 720 parts of crystallized sodium sulphide in 1500 parts of water with a solution of 500 parts of crystallized magnesium chloride in 1000 parts of water,
magnesium sulfide is formed, and. leaves the resulting thin pulpy mass in, which,
Run in suspension of the dinitro prevention. The mixture is heated to 40 'with stirring and held at 40 to <B> -50' for two hours. </B> The deep brown-red colored solution is then acidified with hydrochloric acid and, after cooling, the 4-nitro,
2-amino-1-ogynaphthalene-8-sulfonic acid and sulfur were filtered off. To isolate the pure acid, the suspension is made into a paste in cold water, caustic soda is added until the reaction is weakly alkaline and filtered, if possible with exclusion of air, into weakly diluted hydrochloric acid.
whereby the 4-nitro-2-amino-1-ogynaphthalene-8-sulfonic acid separates out. It is filtered, washed with water and dried.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH192153T | 1936-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH192153A true CH192153A (en) | 1937-07-31 |
Family
ID=4438053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH192153D CH192153A (en) | 1936-05-14 | 1936-05-14 | Process for the preparation of 4-nitro-2-amino-1-oxynaphthalene-8-sulfonic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH192153A (en) |
-
1936
- 1936-05-14 CH CH192153D patent/CH192153A/en unknown
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