ORGANOMETALLIC COMPLEXES COMPRISING BINDING CHELATING LIGANDS ASSOCIATING A NITROGENIC HETEROCYCLE WITH ALCOHOL AND THEIR USE FOR CATALYZING OLIGOMERIZATION OF OLEFINS

摘要

A catalyst composition for the oligomerization of olefins, and in particular ethylene, comprises: at least one nickel complex resulting from the contacting of a nickel salt with a bidentate chelating ligand associating a nitrogen heterocycle with an alcohol; and optionally a hydrocarbylaluminium compound chosen from the group formed by tris (hydrocarbyl) aluminum compounds, chlorinated or brominated hydrocarbylaluminum compounds and aluminoxanes. The olefin oligomerization process using this catalytic composition is also described. .