DIIMINE METAL COMPLEXES, METHODS OF SYNTHESIS, AND METHODS OF USING IN OLIGOMERIZATION AND POLYMERIZATION

摘要

Methods for making a-diimine metal complexes are disclosed. The methods comprise forming an a-diimine metal complex imine bond in the presence of a metal salt or an ce-acylimine metal complex. The method is particularly using for the production of a-diimine metal complexes having two different a-diimine nitrogen groups. The a-diimine metal complexes are useful for polymerizing or oligomerizing olefins. Novel a-diimine metal complexes, particularly iron complexes are disclosed. The a-diimine metal complexes are produced by forming one of the a-diimine metal complex imine bonds in the presence of a metal salt or an a-acylimine metal complex, a-diimine metal complexes having two different a-diimine nitrogen groups may be produced. The a-diimine metal complexes are useful for polymerizing or oligomerizing olefins. Processes to polymerize or oligomerize olefins by contacting olefins with a-diimine metal complexes are disclosed. In particular, alpha olefins can be produced in high selectivity by contacting ethylene with selected a-diimine metal complexes.