| 摘要 |
The invention relates to an improved method for producing 2,2-dichloro or dibromo-phenyl alkyl acetates of formula (1), in which X represents Cl or Br, n represents a whole number from 1 to 5, R represents hydrogen, C<SUB>1</SUB>-C<SUB>8 </SUB>alkyl, aryl, heteroaryl, C<SUB>1</SUB>-C<SUB>8 </SUB>alkoxy, aryloxy or halogen and R1 represents C<SUB>1</SUB>-C<SUB>8 </SUB>alkyl. According to said method, a 2,2-dichloro- or dibromo-phenylacetonitrile of formula (II) is reacted in 0.8 to 2 mol water per mol nitrile of formula (II), 1 to 8 mol alcohol of formula R1OH (III) per mol nitrile of formula (II) and in the presence of 1 to 3 mol HCl or HBr per mol nitrile of formula (II), optionally in the presence of a solvent that is inert in the reaction conditions, to form the corresponding 2,2-dichloro- or dibromo-phenyl alkyl acetates of formula (I), whereby the reaction temperature in the first phase lies between 30 and 60° C. and in the second phase between 60 and 100° C. Once the reaction has taken place, the reaction mixture is cooled to between 20 and 40° C., diluted with water and the 2,2-dichloro- or dibromo-phenyl alkyl acetate of formula (I) is isolated. |
