CH146441A

CH146441A - Process for the preparation of 4-methyl-5.7-dichloro- (2) -thionaphten-4'-methyl-5'-chloro-7'-methoxy- (2 ') -indole-indigo.

Info

Publication number: CH146441A
Authority: CH
Inventors: Aktiengesellsc Farbenindustrie
Original assignee: Ig Farbenindustrie Ag
Priority date: 1928-04-07
Filing date: 1929-04-04
Publication date: 1931-04-15

Description

  

  Verfahren zur Darstellung von     4-Nethyl-5.7-diclalor-(2)-thionaphten-4'-methyl-          6'-chlor-7'-methosy-(2')-indol-indigo.       hol vom Chlorbenzol befreit. Der     4-1VIethyl-          5.7-dichlor-(2)-thionaphteii-4'-        methyl-5'-cblor-          7'-inethoxy-(2')-indol-indigo    färbt die Faser  aus     gelboliver        Küpe    in klaren blauen Tönen  von guter Wasch-, Koch- und Chlorechtheit.

    Der Farbton ist grüner als der der Farbstoffe  des Hauptpatentes Nr. 143034 und des Zu  satzpatentes Nr.     1.45891.       Gegenstand dieses Patentes ist ein Ver  fahren zur Darstellung von     4-Methyl-5.        7-          dichlor    - (2) -     thionaphten-4'-methyl-5'-chlor-7'-          methoxy-(2')-indol-indigo,    welches dadurch ge  kennzeichnet ist,

   dass man     4-Methyl-5.7-          dichlor-3-oxy-thionaphten    in Gegenwart eines       indifferenten    organischen Lösungsmittels mit  einem reaktionsfähigen     a-Derivat    des     4-Methyl-          5-chlor-7-methoxy-isatins    kondensiert.  



       Beispiel:     22,6 Gewichtsteile     4-Methyl-5-chlor-7-          methoxy-isatin    werden durch Erwärmen mit  22 Gewichtsteilen     Phosphorpentachlorid    in  200 Gewichtsteilen Chlorbenzol in das     Isatin-          a-chlorid    verwandelt und mit einer Lösung  von 23,3 Gewichtsteilen     4-Methyl-5.7-dichlor-          3-oxy-l-thionaphten    in 200 Gewichtsteilen  Chlorbenzol vereinigt. Der neue Farbstoff  wird filtriert und durch Waschen mit Alko-



  Process for the preparation of 4-Nethyl-5.7-diclalor- (2) -thionaphten-4'-methyl-6'-chloro-7'-methosy- (2 ') -indole-indigo. get rid of chlorobenzene. The 4-1VIethyl- 5.7-dichloro- (2) -thionaphteii-4'-methyl-5'-cblor- 7'-inethoxy- (2 ') - indole-indigo dyes the fiber from the yellow-olive vat in clear blue shades of good Fastness to washing, boiling and chlorine.

    The color is greener than that of the dyes of the main patent No. 143034 and the additional patent No. 1.45891. The subject of this patent is a process for the preparation of 4-methyl-5. 7- dichloro - (2) - thionaphten-4'-methyl-5'-chloro-7'-methoxy- (2 ') - indole-indigo, which is characterized by

   that 4-methyl-5.7-dichloro-3-oxy-thionaphthene is condensed in the presence of an inert organic solvent with a reactive α-derivative of 4-methyl-5-chloro-7-methoxy-isatin.



       Example: 22.6 parts by weight of 4-methyl-5-chloro-7-methoxy-isatin are converted into isatin a-chloride by heating with 22 parts by weight of phosphorus pentachloride in 200 parts by weight of chlorobenzene and with a solution of 23.3 parts by weight of 4-methyl -5.7-dichloro-3-oxy-l-thionaphthene combined in 200 parts by weight of chlorobenzene. The new dye is filtered and washed with alcohol

Claims

PATENT CLAIM: Process for the preparation of 4-methyl-5,7-dichloro - (2) - thionaphtene - 4 '- methyl-5' chloro-7'-methoxy- (2 ') - indole-indigo, characterized in that 4-methyl-5.7-dichloro-3-oxythionaphthene is condensed in the presence of an indifferent organic solvent with a reactive α-derivative of 4-112ethyl-5-chloro-7-methoxy-isatin.

The dye obtained in this way dyes the fiber from the yellow-olive vat in clear blue shades of good fastness to washing, boiling and chlorine. The color tone is greener than that of the dyes of the main patent No. 143034 and the additional patent No. 145891. SUBClaim: Process according to patent claim, characterized in that the condensation is carried out in chlorobenzene.