Process for the production of halogeno-o-hydroxydiphenyl compounds

摘要

There is described a four step process for the production of halogeno-o-hydroxydiphenyl compounds having the formula in which X is -O- or -CH2-; m is 1 to 3; and n is 1 or 2; wherein in the first step, a diphenyl compound is chlorinated; in a second step the chlorinated compound is acylated in a Friedel-Crafts reaction and optionally again chlorinated after the acylation; in a third step the acyl compound is oxidised; and in a fourth step the oxidized compound is hydrolyzed. The compounds of formula (1) are useful for the protection of organic materials against microorganisms.