Process for the preparation of thioindigo compounds

Details Process for the preparation of thioindigo compounds Process for the preparation of thioindigo compounds

1983-09-26

1985-11-26

Siegel, Alan

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549 45, C07D33324

Patent

active

045555800

ABSTRACT:
Process for the preparation of thioindigo compounds of the formula ##STR1## in which A and B designate identical or different, optionally substituted benzene rings or benzene rings to which further carbocyclic and heterocyclic rings can be fused,
characterized in that compounds of the formula ##STR2## in which A and B have the abovementioned meaning, are reacted in a mixture of chlorosulphonic acid and a further halide of an inorganic acid and, if appropriate, the resulting reaction product is oxidized in a manner which is in itself known and the batch is worked up to give compounds of the formula (I).

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