Process for the preparation of 4,4'-dihalogen-o-hydroxydiphenyl compounds

摘要

A description is given of a three-step process for the preparation of 4,4'-dihalogen-o-hydroxydiphenyl compounds of formula (1) which comprises: a) halogenating an alkoxyphenol of formula (6), reacting the resulting halogenated phenol compound of formula (5) with p-dihalobenzene of formula (4a) in the presence of copper and/or copper salts to the diphenyl ether compound of formula (2) and subsequent ether fission to the diphenyl ether compound of formula (1); or b) reacting an alkoxyphenol of formula (6) with the halophenol of formula (4b) to the compound of formula (3), then halogenating this compound and subsequent ether fission of the resulting compound of formula (2) to the diphenyl ether compound of formula (1). The compounds of formula (1) are used for protecting organic materials and objects against microorganisms.