Patent ID: 6927313
Filing Date: 2005-08-09
Classification: C07C

Abstract:
1. A process for the selective oligomerization of ethylene to give essentially C 4 -C 8 α-olefins, characterized in that it is carried out in the presence of a catalytic system comprising the complex having general formula (II) wherein L represents the ligand having general formula (I) wherein R R R M is a metal selected from transition metals, i.e. metals of groups 3 to 12 of the periodic table, and lanthanides; the above metal M being in oxidation state “s” positive different from zero, generally between 1 and 4; Y is selected from groups of an anionic nature bound to the metal as anion in ionic couple or with a covalent bond of the “σ” type; n expresses the number of Y groups sufficient for neutralizing the formal oxidation charge “s” of the metal M.