Patent ID: 8153820

Claim:
A process for preparing compounds of the formula (I) in which R 1 is phenyl or C 3 -C 7 -cycloalkyl which are unsubstituted or have 1, 2 or 3 substituents R a1 independently of one another selected from the group consisting of halogen, C 1 -C 8 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -alkylthio, C 1 -C 4 -haloalkyl, C 1 -C 4 -haloalkoxy, C 1 -C 4 -haloalkylthio and C 3 -C 7 -cycloalkyl, R 1a is hydrogen or fluorine, or R 1a together with R 1 is C 3 -C 5 -alkandiyl or C 5 -C 7 -cycloalkanediyl, where C 3 -C 5 -alkanediyl and C 5 -C 7 -cycloalkanediyl are unsubstituted or have 1, 2 or 3 substituents selected from the group consisting of C 1 -C 4 -alkyl radicals, R 2 is hydrogen, C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl or C 1 -C 4 -alkoxy-C 1 -C 2 -alkyl, X is F or Cl and n is 0, 1, 2 or 3; which comprises A) providing a compound of the formula (II) in which X is F or Cl, Y is Cl or Br and R 2 has one of the meanings given above; and B) reacting a compound of the formula (II) with carbon monoxide and a compound of the formula (III), in which R 1 , R 1a and n have one of the meanings given above, in the presence of a palladium catalyst.