The present invention concerns a process for creating a carbon-carbon or carbon-heteroatom bond by reacting an unsaturated compound carrying a leaving group with a nucleophilic compound. The invention also concerns the creation of a carbon-nitrogen bond using a process for arylating organic nitrogen-containing derivatives. The process of the invention is a process for creating a carbon-carbon or carbon-heteroatom bond by reacting an unsaturated compound carrying a leaving group with a nucleophilic compound carrying a carbon atom or a heteroatom (HE) that can substitute for the leaving group, creating a C—C or C-HE bond, characterized in that the reaction takes place in the presence of an effective quantity of a catalyst based on a metallic element M selected from group (VIII), (IB) and (IIB) of the periodic table and at least one at least bidentate ligand comprising at least two chelation atoms, namely at least one oxygen atom and at least one nitrogen atom.