| 摘要 |
FIELD: organic chemistry, chemical technology. ^ SUBSTANCE: invention relates to a method for preparing 4,4'-dichloro-o-hydroxydiphenyl ester of the formula 1) wherein Hal1 and Hal2 means chlorine atom. Method involves halogenation of alkoxyphenol of the formula (6) wherein R1 means (C1-C5)-alkyl (stage a1). The stage (a1) is carried out using elementary chlorine or sulfuryl chloride in the presence of an organic solvent taken among aromatic, aliphatic or cycloaliphatic hydrocarbon and interaction of prepared halide-substituted phenol of the formula (5): wherein R1 and Hal1 have values indicated above with para-dihalogenbenzene of the formula (4a) wherein Hal2 means chlorine atom and Hal3 means bromine atom in the presence of copper and/or copper salts as a catalyst and alkaline metal hydroxide taken in the amount from 20 to 80 mass.% of theoretical amount of the parent components to yield the corresponding diphenyl ester of the formula (2): wherein R1, Hal1 and Hal2 have values indicated above (stage a2) followed by cleaving the prepared diphenyl ester of the formula (2) (stage a3). Method provides preparing 4,4'-dichloro-o-hydroxydiphenyl ester without by-side reactions and enhanced economy. ^ EFFECT: improved preparing method. ^ 2 cl, 4 ex |
