Reaktionsgleichung
NC1C=CC=CC=1[S:8]([OH:11])(=[O:10])=[O:9].[N+](C1C=CC(N[C:22]2[C:31]3[C:26](=[CH:27][C:28](S(O)(=O)=O)=[CH:29][C:30]=3[OH:32])[CH:25]=[C:24]([S:37]([OH:40])(=[O:39])=[O:38])[CH:23]=2)=CC=1)([O-])=O.[S-2].[Na+].[Na+].[Cl-].[Na+]>>[OH:32][C:30]1[C:31]2[C:26](=[CH:25][C:24]([S:37]([OH:40])(=[O:38])=[O:39])=[CH:23][CH:22]=2)[C:27]([S:8]([OH:11])(=[O:10])=[O:9])=[CH:28][CH:29]=1Komponenten
Versuchsvorschrift
6.8 parts of 2,4,6-trifluoro-1,3,5-triazine are added dropwise to a solution of 13.4 parts of 1,4-diaminobenzene-2,5-disulphonic acid in 200 parts by volume of water at 0° C. and a pH value of 4 to 5 is maintained by constantly neutralising the hydrogen fluoride liberated. The course of the reaction is followed chromatographically. The resulting solution of the intermediate product is condensed, at a pH value of 7 to 8 and at 10° to 20° C. with 31 parts of the aminoazo dyestuff obtained by coupling diazotised 1-aminobenzene-2-sulphonic acid with 1-(4'-nitrophenylamino)-8-hydroxynaphthalene-3,6-disulphonic acid and subsequently reducing the nitro group with sodium sulphide. The dyestuff is salted out completely with sodium chloride, filtered off, washed and again converted to a neutral solution in 500 parts by volume of water. Further diazotisation of the resulting aminoazo dyestuff and coupling with 15 parts of 1-hydroxynaphthalene-4,6-disulphonic acid gives the dyestuff of the formula ##STR43## which is precipitated with sodium chloride, isolated and then washed and dried. It is a dark red powder which gives a red solution in water.
Aufarbeitung
- filtrationfiltered off
- washwashed
Quellen und Nachweise
- ORD-Eintrag
- ord-7a2f504082914162aa6b1e8fdc6ad59a
- Quelldatensatz
- uspto-grants-1981_04
- Patentnummer
- US04261889
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