Anthraquinone dyestuffs

Details Anthraquinone dyestuffs Anthraquinone dyestuffs

1975-10-20

1977-08-30

Demers, Arthur P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

8 39C, 8 40, 260380, C09B 110

Patent

active

040454576

ABSTRACT:
The invention relates to a process for the preparation of water-insoluble chlorine-containing diaminodihydroxyanthraquinone dyestuffs. The process consists in that 2,8-dichloro-1,5-dinitroanthraquinone and/or 2,5-dichloro-1,8-dinitroanthraquinone is warmed with sulphur in concentrated sulphuric acid having a maximum SO.sub.3 content of 20% - possibly in the presence of boric acid - the resulting compounds are, if appropriate, post-halogenated and/or alkylated, preferably in the same reaction batch.
The main advantage of this process is that it starts from 1,6- and/or 1,7-dichloroanthraquinone, for which there was hitherto no industrial use, but which unavoidably also arise during the synthesis 1,5- and 1,8-dichloroanthraquinones.

REFERENCES:
patent: 2134654 (1938-10-01), Lulek
patent: 3821262 (1974-06-01), Schoenauber et al.
Murakami et al., Chem. Abstracts 80 (1974), No. 16444k.
Chemical Abstracts, 8th Collective Index, p. 4900F.

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