| abstract |
A kind of process for preparing difluoromethoxyarenes of the general formula I. The Ar represents phenyl which is substituted by nitro or C1-C4-acyl by reacting hydroxyarenes or mercaptoarenes of the general formula II in which Ar has the same said meaning, with chlorodifluoromethane in the presence of an aqueous alkali meta hydroxide or alkaline earth metal hydroxide at temperatures of between 60 degree C and 120 degree C, characterized in that the reaction is carried out in the presence of a phase-transfer catalyst from tetrabutyl-ammonium bromide or tetrabutylphosphonium bromide, and in the presence of a non-polar or moderately polar solvent from toluene, xylene or methyl tert-pentyl ether. |