| 摘要 |
Process for the preparation of thioindigo compounds of the formula <IMAGE> (I) in which A and B designate identical or different optionally substituted benzene rings or benzene rings onto which further carbocyclic and heterocyclic rings are fused, characterized in that compounds of the formula <IMAGE> (IIa) <IMAGE> (IIb) in which A and B have the meaning indicated above and X designates halogen, such as bromine and, preferably, chlorine, are reacted in a liquid mixture of an aluminium halide, an alkali metal halide and SO2 and the resulting intermediate product is then oxidized in a manner which is in itself known, if appropriate after first being isolated, and the mixture is worked up to give the compounds of the formula (I).
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