Process for preparing monofunctional, bifunctional and/or polyfunctional biaryls of the general formula in which Z is hydrogen or oxygen n is an integer selected from 1, 2 or 3 and X is independently selected from the group consisting of F, Cl, C 1 -C 4 -alkyl and C 1 -C 4 -alkyloxy groups; m is an integer selected from 0, 1, 2, 3, 4 or 5 and Y is independently selected from halogen, C 1-4 -alkyl, C 1-4 -alkoxy, C 1-4 -haloalkyl, C 1-4 -haloalkoxy and hydroxy groups, by reacting haloaromatics of the general formula in which Hal is a halogen atom with (a) at least one boronic acid of the general formula (III-a) in which Q 1 and Q 2 are hydroxyl groups (-OH) or with the anhydrides, dimers and trimers formed from the boronic acids of the formula (III-a); or with at least one boronic acid derivative of the formula (III-a), in which Q 1 and Q 2 are independently selected from the group consisting of F, Cl, Br, I, C 1-4 -alkyl, C 6-10 -aryl, C 1-4 -alkoxy and C 6-10 -aryloxy groups; or with (b) at least one cyclic boronic ester of the formula (III-b) in which A is selected from radicals selected from the group consisting of -CH 2 -CH 2 -, -C(CH 3) 2 -C(CH 3) 2 -, -CH 2 -C(CH 3) 2 -CH 2 -; or with (c) at least one boronate of the general formula (III-c) in which M + is a cation; or (d) at least one borinic acid of the general formula (III-d) in which Y, Q 1 and m are as defined above, in the presence of at least one palladium phosphine complex which is generated in situ by adding a palladium source and a phosphine ligand, characterized in that the phosphine group is substituted by at least one branched C 3-8 -alkyl group and the palladium source is palladium acetylacetonate or palladium dibenzylideneacetonate. Z is hydrogen or oxygen n is an integer selected from 1, 2 or 3 and X is independently selected from the group consisting of F, Cl, C 1 -C 4 -alkyl and C 1 -C 4 -alkyloxy groups; m is an integer selected from 0, 1, 2, 3, 4 or 5 and Y is independently selected from halogen, C 1-4 -alkyl, C 1-4 -alkoxy, C 1-4 -haloalkyl, C 1-4 -haloalkoxy and hydroxy groups, Hal is a halogen atom (a) at least one boronic acid of the general formula (III-a) in which Q 1 and Q 2 are hydroxyl groups (-OH) or with the anhydrides, dimers and trimers formed from the boronic acids of the formula (III-a); or with at least one boronic acid derivative of the formula (III-a), in which Q 1 and Q 2 are independently selected from the group consisting of F, Cl, Br, I, C 1-4 -alkyl, C 6-10 -aryl, C 1-4 -alkoxy and C 6-10 -aryloxy groups; or with Q 1 and Q 2 are independently selected from the group consisting of F, Cl, Br, I, C 1-4 -alkyl, C 6-10 -aryl, C 1-4 -alkoxy and C 6-10 -aryloxy groups; (b) at least one cyclic boronic ester of the formula (III-b) in which A is selected from radicals selected from the group consisting of -CH 2 -CH 2 -, -C(CH 3) 2 -C(CH 3) 2 -, -CH 2 -C(CH 3) 2 -CH 2 -; or with A is selected from radicals selected from the group consisting of -CH 2 -CH 2 -, -C(CH 3) 2 -C(CH 3) 2 -, -CH 2 -C(CH 3) 2 -CH 2 -; (c) at least one boronate of the general formula (III-c) in which M + is a cation; or M + is a cation; or (d) at least one borinic acid of the general formula (III-d) in which Y, Q 1 and m are as defined above,