Process for the preparation of 4,4',7,7'-tetrachlorthioindigo in

Details Process for the preparation of 4,4',7,7'-tetrachlorthioindigo in Process for the preparation of 4,4',7,7'-tetrachlorthioindigo in

1980-06-27

1981-11-10

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C09B 700

Patent

active

042999669

ABSTRACT:
4,4',7,7'-Tetrachlorothioindigo can be obtained in a form directly suitable for use as a pigment if the oxidation of 3-hydroxy-4,7-dichloro-1-thionaphthene is performed in an alkaline medium in the presence of oxygen or an oxygen-containing gas.

REFERENCES:
patent: 1710981 (1929-04-01), Hoffa
patent: 1938054 (1933-12-01), Steiger
patent: 2029714 (1936-02-01), Hagenbocker

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