CH125113A - 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
- CH125113A CH125113A CH125113DA CH125113A CH 125113 A CH125113 A CH 125113A CH 125113D A CH125113D A CH 125113DA CH 125113 A CH125113 A CH 125113A
- Authority
- CH
- Switzerland
- Prior art keywords
- water
- acid
- molecule
- isatin
- soluble
- 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
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
- C07D209/04—Indoles; Hydrogenated indoles
- C07D209/30—Indoles; Hydrogenated indoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to carbon atoms of the hetero ring
- C07D209/32—Oxygen atoms
- C07D209/38—Oxygen atoms in positions 2 and 3, e.g. isatin
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Indole Compounds (AREA)
Description
Verfahren zur Darstellung eines. ivasserlösliehen Isatin-a-derivates. Im Hauptpatent ist die Darstellung eines wasserlöslichen Chlorisatinderivates beschrie ben, das durch Umsetzung von Chlorisatin- a-clilorid mit Sulfiten erhalten wird, und da.s 2-Schw efligsäurereste, davon einen in a-Stel- lung, gebunden enthält.
In ähnlicher Weise kann, auch ein 5,7-Di- chlorisati.nderivat: durch Einwirkung von Sulfiten auf 5,7-Dichlörisatin-a-chlorid er= halten werden.
<I>Beispiel,:</I> 21,7 Gewichtsteile 5,7-Dichlorisatin wer den mit 22 Gewichtsteilen Phosphorpenta- clil.orid. in 1.30 Gewichtsteile Chlorbenzol in das 5,7-Dichlorisatin-a-clilorid übergeführt und dann unter kräftigem Rühren in eine Lösung von 1.1.0 Gewichtsteilen Na.triumsul- fit (wasserfrei) in 400 Teilen Wasser ge geben. Man lässt etwa. vier Stunden rühren und steigert die Temperatur von 30 bis etwa 90 .
Dann wird das Chlorbenzol mit Wasserdampf abgetrieben, die Lösung mit Salzsäure kongosauer gestellt und einige Zeit gekocht. Man saugt dann heiss vom ausbe- scliiedenen, nicht umgesetzten Dichlorisatin ab und scheidet im Filtrat durch Eindunsten oder Aussalzen mit Kochsalz das Natrium salz des wasserlöslichen Dichlorisatin-a-deri- vates ab.
Die neue Verbindung lässt sich mit Naph- tölen und ähnlich reagierenden Ketomethy- lenverbindungen zu indigoiden Farbstoffen kondensieren. Sie ist beständig gegen ver dünnte Säuren.
Durch Kochen mit Alkalien und nachfolgenden Ansäuern lässt sie sich unter Abspaltung von schmrefliger Säure in Dichlorisatin überführen, während sie mit: H3-drosulfit in. alkalischer Lösung in die Leukoverbindung des :5,5', 7, 7'-Tetrachlor- indigos übergeht. Beim Versetzen der wäs serigen Lösung mit Ätzalka.lien tritt vorüber- geliend eine intensive Rotviolettfärbung auf.
Die Verbindung ist beträchtlich lichtemp findlich. Bei der Kondensation mit a-Na.ph- tol erhält man den (Naplitaliil-2) - (di.chlor- 5'.
U m aus dem Na,triumsalz die freie Säure zu erhalten, muss man das Salz mit Säure zersetzen. Um die frei(, Säure in reiner Form zu erhalten, stellt inan am besten zunächst das scher lösliche Bariumsalz dar, setzt es mit der berechneten Menge verdünnter Schwefelsäure um und saugt vom ausge schiedenen Bariumsulfat ab. Die freie Säure ist nur in verdünnter Lösung beständig.
Durch -Neutralisieren dieser Lösung mit den verschiedenen Metallkarbonaten bezw. -oty- den lassen sich bequem die einzelnen Metall salze der neuen Verbindung erhalten.
Method for representing a. iv water-soluble isatin-a-derivatives. The main patent describes the preparation of a water-soluble chlorisatin derivative which is obtained by reacting chlorisatin a-chloride with sulfites and which contains 2-sulfuric acid residues, one of which is bonded in a-position.
A 5,7-dichlorisati.nderivat can also be obtained in a similar way by the action of sulfites on 5,7-dichloroisatin a-chloride.
<I> Example: </I> 21.7 parts by weight of 5,7-dichloroisatin with 22 parts by weight of phosphorus pentacyloride. in 1.30 parts by weight of chlorobenzene converted into the 5,7-dichloroisatin a-cliloride and then poured into a solution of 1.1.0 parts by weight of sodium trium sulfite (anhydrous) in 400 parts of water with vigorous stirring. One lets about. Stir for four hours and increase the temperature from 30 to about 90.
Then the chlorobenzene is driven off with steam, the solution is acidified to Congo with hydrochloric acid and boiled for some time. The unreacted dichlorosatin which has been separated off is then suctioned off while hot and the sodium salt of the water-soluble dichlorosatin a derivative is separated off in the filtrate by evaporation or salting out with common salt.
The new compound can be condensed with naphtha oils 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 dichloroisatin with elimination of foul acid, while with: H3-drosulfite in alkaline solution it converts into the leuco compound of: 5,5 ', 7, 7'-tetrachloroindigo. When the aqueous solution is mixed with caustic alkali, an intense red-violet coloration occurs temporarily.
The connection is considerably sensitive to light. The condensation with α-Na.ph- tol gives (Naplitaliil-2) - (di.chlor-5 '.
In order to obtain the free acid from the sodium salt, the salt must be decomposed with acid. In order to obtain the free acid in pure form, it is best to first prepare the shearly soluble barium salt, react it with the calculated amount of dilute sulfuric acid and suck off the separated barium sulfate. The free acid is only stable in dilute solution.
By neutralizing this solution with the various metal carbonates respectively. -oty- 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 |
---|---|---|---|
CH125113T | 1926-10-14 | ||
CH123929T | 1926-10-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH125113A true CH125113A (en) | 1928-04-02 |
Family
ID=25710163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH125113D CH125113A (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) | CH125113A (en) |
-
1926
- 1926-10-14 CH CH125113D patent/CH125113A/en unknown
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