| 摘要 |
1. Process for the preparation of gamma-halogenocarboxylic acid esters of the formula (IV) see diagramm : EP0005472,P7,F1 in which R**1 and R**2 are identical or different and represent hydrogen or halogen, R**3 - R**6 are identical or different and represent hydrogen or optionally substituted alkyl, R**7 represents halogen and R**8 represents an optionally substituted hydrocarbon radical, by reacting a compound of the general formula (V) see diagramm : EP0005472,P7,F2 in which R**1 - R**5 have the meaning indicated above and R**7 represents halogen, with an orthoester of the general formula (VI) see diagramm : EP0005472,P7,F3 in which R**6 has the meaning indicated above and R**8 , R**9 and R**10 are identical or different und represent an optionally substituted hydrocarbon radical, or with a ketene acetal of the general formula (VII) see diagramm : EP0005472,P7,F4 in which R**6 , R**8 and R**9 have the meaning indicated above, if appropriate in an organic solvent and if appropriate in the presence of an acid catalyst, characterised in that the mixture obtained in this reaction is treated with at most 1 molar equivalent of a halogenating agent and an alcohol. |
