Process for the ring chlorination of aromatic hydrocarbons

摘要

Aromatic hydrocarbons which are monosubstituted by straight-chain or branched C1-C12-alkyl or by C3-C8-cycloalkyl can be chlorinated in the presence of Friedel-Crafts Catalysts in liquid phase on the aromatic ring if cyclic benzo-fused imines or benzo[f]-1,4-thiazepines are used as co-catalysts. This makes it possible to obtain a higher proportion of p-isomers.