| 摘要 |
1. Pocess for the preparation of 2,4-dichloro-5-fluoro-benzoic acid of the formula (I) see diagramm : EP0176026,P5,F1 characterized in that 2,4-dichlorofluorobenzene is reacted with acetyl chloride, in the presence of acylation catalysts an optionally in the presence of diluents, at temperatures between 108C an 1508C and the reaction product, 2,4-dichloro-5-fluoro-acetophenone of the formule (II) see diagramm : EP0176026,P5,F2 formed in this way is, if appropriate after isolation, reacted with a sodium hypochlorite solution (in the form of the so-called chlorinated soda solution) at a temperature between 08C and 1408C and the compound of the formula (I) is isolated by conventional methods. |
