Patent ID: 7772446

Claim:
A process for preparing substituted biphenyls of the formula I in which the substituents are defined as follows: R 1 is nitro, amino or NHR 3 , R 2 is halogen, R 3 is C 1 -C 4 -alkyl, C 2 -C 4 -alkenyl or C 2 -C 4 -alkynyl, m is 1 or 2, where, in the case that m =2, the two R 1 radicals may have different definitions, n is 1, 2 or 3, where, in the case that n =2 or 3, the two R 2 radicals may have different definitions, which comprises reacting a compound of the formula II in which Hal is halogen and R 1 and m are each as defined above, in the presence of a base and of a palladium catalyst selected from the group of: a) palladium-triarylphosphine or palladium-trialkylphosphine complex with palladium in the zero oxidation state, b) salt of palladium in the presence of triarylphospine or trialkylphosphine as a complex ligand or c) metallic palladium, in the presence of triarylphosphine or trialkylphosphine, in a solvent, with a diphenylborinic acid (III) in which R 2 and n are each as defined above, where the triarylphosphines or trialkylphosphines used may be substituted.