Catalyst components based on fulvene complexes

1. A method for preparing a metallic complex comprising:

providing a metallic precursor MZ n wherein M is a metal Group 7 to 11 of the Periodic Table, Z is a negatively charged counter-anion and n is the valence of M;

complexing the metallic precursor with a ligand of formula:

wherein both R are the same and are selected from aryl, alkyl arylalkyl, alkylaryl having at most 20 carbon atoms, and Y is an element Group 1 of the Periodic Table; and

retrieving a metallic complex.

2. The method of claim 1 , wherein R is alkyl, substituted or unsubstituted phenyl group, CPh2 wherein phenyl group Ph is substituted or unsubstituted or furan-containing group.

3. The method of claim 2 , wherein R is tert-butyl or furan.

4. The method of claim 1 , wherein Y is H or Na.

5. The method of claim 1 , wherein M is Ni.

6. The method of claim 1 , wherein Z is halogen or acetate.

7. The method of claim 1 , wherein the ligand is deprotonated with a base prior to complexation.

8. The method of claim 7 , wherein the base is NaH.

9. A metallic complex obtained by the method of claim 1 .

10. An active catalyst comprising the metallic complex of claim 9 , an activating agent having an ionising action and optionally a support.

11. The active catalyst system of claim 10 , wherein the activating agent is methylaluminoxane.

12. A method for oligomerising or for homo- or co-polymerising ethylene and alpha-olefins comprising:

injecting the active catalyst of claim 10 into a reactor;

injecting the monomer and optional comonomer into the reactor;

maintaining the reactor under polymerisation conditions to form a polymerization product selected from oligomers, polymer or combinations thereof; and

retrieving the product from the reactor.

13. The method of claim 12 , wherein the monomer and comonomer are selected from ethylene or propylene.

14. A method for preparing an active catalyst system comprising:

providing a hydroxyl-carbonyl fulvene ligand;

optionally deprotonating the ligand with a base;

complexing the ligand with a metallic salt MZ n in a solvent, wherein M is a metal of Group 7 to 11 of the Periodic Table, wherein Z is a negatively charged counter-anion, and wherein n is the valence of M;

retrieving a catalyst component;

optionally depositing the catalyst component on a support;

activating the catalyst component with an activating agent having an ionising action;

optionally adding a scavenger; and

retrieving an active oligomerisation or polymerisation catalyst system.