DIMERISATION DE MONOOLEFINES CATALYSEE PAR DES COMPLEXES DU NICKEL ET DU COBALT GENERES ELECTROCHIMIQUEMENT

Article abstract of DOI:10.1016/S0022-328X(00)99541-X

Dimerization of olefins was performed with NiL2X2 and CoL2X2 complexes by an electrochemical reduction process under controlled cathodic potential.The influence of several parameters (choice of anode, supporting electrolyte, ligand, temperature and pressure) was studied in order to increase the dimer production and selectivity.In case of ethylene, with nickel-based catalysts, 2-butenes are formed selectively with a turn-over number of 12 000 within 50 h.With propylene as substrate methylpentenes are the main products, in which case the reaction rate appears to be two orders of magnitude lower than with ethylene under identical conditions.Although less active, cobalt based catalysts show an unusual behaviour, as they are particularly selective for 1-butene production (>90percent).