Patent ID: 7381832

Claim:
A process for preparing a compound of formula (III) wherein R 1 , R 2 , R 3 and R 4 are identical or different and in each case represent hydrogen, fluorine, chlorine or bromine, at least two of these radicals being other than hydrogen and X represents OR 5 or N(R 8 )(R 7 ), where R 5 represents hydrogen or C 1 -C 10 -alkyl, phenyl or benzyl and R 6 and R 7 are identical or different and in each case represent C 1 -C 10 -alkyl and R 8 represents hydrogen, chlorine, bromine or optionally substituted C 1 -C 10 -alkyl, the process comprising: reacting (1) a diazonium salt of the formula (IV) wherein R 1 , R 2 , R 3 and R 4 have the meaning indicated in formula (III) and A ⊖ represents an equivalent of halide, hydrogensulfate, nitrate, acetate or tetrafluoroborate ions or ½ an equivalent of sulfate ions or ⅓ an equivalent of phosphate ions, with (2) a compound of the formula (V) wherein X has the meaning indicated in formula (III) and R 8 represents hydrogen, chlorine, bromine or optionally substituted C 1 -C 10 -alkyl, in the presence of a homogeneous, palladium-containing catalyst at a temperature ranging from about −5 to about +100° C.