| abstract |
A method for nuclear chlorination of ortho-xylene is provided. A process for the nuclear chlorination of ortho-xylene, comprising using a chlorinating agent in the presence of at least one Friedel-Crafts catalyst and a chloro-substituted 2,8-dimethylphenoxathiin as co-catalyst. The cocatalyst used is preferably a tetrahalogenated 2,8-dimethylphenoxathiin, in particular of the formula ## STR1 ## 1,3,7,9-tetrachloro-2,8-dimethylphenoxathiin. [Selection diagram] None |