CH125114A - Process for the preparation of a water-soluble isatin-a-derivative. - Google Patents
Process for the preparation of a water-soluble isatin-a-derivative.Info
- Publication number
- CH125114A CH125114A CH125114DA CH125114A CH 125114 A CH125114 A CH 125114A CH 125114D A CH125114D A CH 125114DA CH 125114 A CH125114 A CH 125114A
- Authority
- CH
- Switzerland
- Prior art keywords
- water
- acid
- molecule
- isatin
- bromoisatin
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B7/00—Indigoid dyes
- C09B7/02—Bis-indole indigos
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D239/32—One oxygen, sulfur or nitrogen atom
- C07D239/38—One sulfur atom
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Indole Compounds (AREA)
Description
Verfahren zur Darstellung eines wasserlöslichen Isatin-a-derivates. Im Hauptpatent ist die Darstellung eines wasserlöslichen Chlorisatinderivates beschrie ben, das durch Umsetzung von Chlorisatin- a-ehlorid mit Sulfiten erhalten wird, und das 2-Schwefligsäurereste, davon einen in a-Stel- lung, gebunden enthält.
In ähnlicher Weise kann auch ein Brom- isatinderivat durch Einwirkung von Sulfiten auf 5-Bromisatin-a-chlorid erhalten werden. <I>Beispiel:</I> 22,6 Gewichtsteile Bromisatin werden mit 22 Gewichtsteilen Phosphorpentachlorid in <B>1.30</B> Gewichtsteilen Chlorbenzol in das 5- Bromisatin-a-chlorid übergeführt und dann unter kräftigem Rühren in eine Lösung von <B>110</B> Gewichtsteilen Natriumsulfit (wasser frei) in 400 Teilen Wasser gegeben.
Man lässt etwa vier Stunden rühren und steigert die Temperatur von 30 bis etwa 90 . Dann wird das Chlorbenzol mit Wasserdampf ab getrieben, die Lösung mit Salzsäure kongo sauer gestellt und einige Zeit gekocht. Man saugt dann heiss vom ausgeschiedenen, nicht umgesetzten Bromisatin ab und scheidet im Filtrat durch Eindunsten oder Aussalzen mit Kochsalz das Natriumsalz des wasserlös lichen Bromisatin-a-derivates ab.
Die neue Verbindung lässt sich mit Naph- tolen und ähnlich reagierenden Ketomethy- lenverbindungen zu indigoiden Farbstoffen kondensieren. Sie ist beständig gegen ver dünnte Säuren.
Durch Kochen mit Alkalien und nachfolgendes Ansäuern lässt sie sich un ter Abspaltung von schwefliger Säure in 5- Bromisatin überführen, während sie mit Hy- drosulfit in alkalischer Lösung in die Leuko- verbindung des 5,5-Dibromindigos übergeht. Beim Versetzen der wässerigen Lösung mit Atzalkalien tritt vorübergehend eine inten sive Rotviolettfärbung auf. Die Verbindung ist beträchtlich lichtempfindlich.
Bei der Kondensation mit a-Naphtol erhält man den (Naphtalin-2)-(brom-5'-indol-2)-indigo.
Um aus dem Natriumsalz die freie Säure zu erhalten, muss man das Salz mit Säure zersetzen. Um die freie Säure in reiner Form zu erhalten, stellt man am besten zunächst das schwer lösliche Silbersalz dar, setzt es mit der berechneten Menge verdünnter Salz- säure um und saugt vom ausgeschiedenen Chlorsilber ab. Die freie Säure ist nur in verdünnter Lösung beständig. Durch Neu tralisieren dieser Lösung mit den verschiede nen Metallkarbonaten bezw. -oxyden lassen sich bequem die einzelnen Metallsalze der neuen Verbindung erhalten.
Process for the preparation of a water-soluble isatin-a-derivative. The main patent describes the preparation of a water-soluble chlorisatin derivative which is obtained by reacting chlorisatin a-ehloride with sulfites and which contains 2-sulfuric acid residues, one of which is in the a position.
In a similar way, a bromoisatin derivative can also be obtained by the action of sulfites on 5-bromoisatin a-chloride. <I> Example: </I> 22.6 parts by weight of bromoisatin are converted with 22 parts by weight of phosphorus pentachloride in <B> 1.30 </B> parts by weight of chlorobenzene into 5-bromoisatin a-chloride and then, with vigorous stirring, into a solution of B> 110 parts by weight sodium sulfite (anhydrous) given in 400 parts of water.
The mixture is stirred for about four hours and the temperature is increased from 30 to about 90. Then the chlorobenzene is driven off with steam, the solution is acidified with Congo hydrochloric acid and boiled for some time. It is then suctioned off hot from the precipitated, unreacted bromisatin and the sodium salt of the water-soluble bromisatin-a-derivative is separated in the filtrate by evaporation or salting out with common salt.
The new compound can be condensed with naphtholes and similar reacting ketomethylene compounds to form indigoid dyes. It is resistant to diluted acids.
By boiling with alkalis and subsequent acidification, it can be converted into 5-bromoisatin with elimination of sulphurous acid, while with hydrosulphite in alkaline solution it changes into the leuco compound of 5,5-dibromoindigo. When caustic alkalis are added to the aqueous solution, an intense red-violet coloration occurs temporarily. The compound is considerably sensitive to light.
The condensation with α-naphthol gives (naphthalene-2) - (bromo-5'-indole-2) -indigo.
In order to obtain the free acid from the sodium salt, the salt must be decomposed with acid. In order to get the free acid in pure form, it is best to first prepare the sparingly soluble silver salt, react it with the calculated amount of dilute hydrochloric acid and suck off the precipitated silver chloride. The free acid is stable only in dilute solution. By neutralizing this solution with the various metal carbonates BEZW. oxides, the individual metal salts of the new compound can be easily obtained.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH125114T | 1926-10-14 | ||
CH123929T | 1926-10-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH125114A true CH125114A (en) | 1928-04-02 |
Family
ID=25710164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH125114D CH125114A (en) | 1926-10-14 | 1926-10-14 | Process for the preparation of a water-soluble isatin-a-derivative. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH125114A (en) |
-
1926
- 1926-10-14 CH CH125114D patent/CH125114A/en unknown
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