The electrophilic chlorination of some hexa-substituted benzenes has been investigated. Both 3,5-dichloro-2,4,6-trimethylanisole and the parent phenol lead to cyclohexadienone formation. The isomer composition of the product depends on the solvent as well as on the substrate. In trifluoroacetic acid the anisole derivative probably undergoes primary attack of the electrophile on the 4-position. The