Process for preparing 3-fluoro-4,6-dichlorotoluene
AssigneeBayer Aktiengesellschaft
InventorWerner Bussmann
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Abstract
3-Fluoro-4,6-dichlorotoluene is prepared with reduced formation of 3-fluoro-2,6-dichlorotoluene by chlorinating 3-fluorotoluene in the presence of a catalyst system to give a mixture containing 3-fluoro-6-chlorotoluene and 3-fluoro-4-chlorotoluene and chlorinating this in the presence of another catalyst system to give 3-fluoro-4,6-dichlorotoluene.
Claims11
A process for preparing 3-fluoro-4,6-dichlorotoluene with reduced formation of 3-fluoro-2,6-dichlorotoluene, in which 3-fluorotoluene is chlorinated in the presence of Friedel-Crafts catalyst and sulphur to give a mixture containing 3-fluoro-6-chlorotoluene and 3-fluoro-4-chlorotoluene and this is chlorinated in the presence of Friedel-Crafts catalyst and a thiazepine compound to give 3-fluoro-4,6-dichlorotoluene.
Dependencies are inferred from the claim text.