Patent ID: 6956095

Claim:
Process for the reaction of a halogen- or sulphonyloxy-functional aryl or heteroaryl compound with an aromatic or heteroaromatic boron compound in the presence of a catalytic amount of a palladium compound, a base and a multi-phase solvent mixture wherein an aryl-aryl or aryl-heteroaryl or heteroaryl-heteroaryl C—C bond is formed, characterised in that a. the solvent mixture comprises at least 0.1% by volume of a compound from each of the following groups i) water-miscible organic solvents ii) water-immiscible organic solvents iii) water, with the proviso that both alcohols and carbonyl compounds which contain α-hydrogen atoms are excluded; b. and the palladium compound does not contain triphenylphosphine or the latter is not specifically added to the reaction mixture.