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Asymmetric complexes of formula (I): Figure 112015067422023-pct00053 (I) [In the formula (I), M is zirconium or hafnium; Each X is a sigma ligand; L is a bivalent bridge selected from -R ' 2 C-, -R' 2 C-CR ' 2- , -R' 2 Si-, -R ' 2 Si-SiR' 2- , -R ' 2 Ge-, Where each R 'is independently a hydrogen atom, C1-C20-alkyl, tri (C1-C20-alkyl) silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; R 2 and R 2 ' are each independently a C 1 -C 20 hydrocarbyl radical; R 5 'is C 1 -20 hydrocarbyl group; R 5 is hydrogen, or C 1 -20 hydrocarbyl group; R 6 is a non-tertiary C 1 -10 alkyl, or C6-10- aryl group or an arylalkyl group or C7-10- ZR 3 and; Z is O or S; R 6 'is tertiary C 4 -20 alkyl group; R 3 is a C1-20 hydrocarbyl group, optionally substituted with halo; Ar is an aryl or heteroaryl group having up to 20 carbon atoms optionally substituted with one or more R 1 groups; Ar 'is an aryl or heteroaryl group having up to 20 carbon atoms optionally substituted with one or more R 1 groups; Each R 1 is C 1 -20 hydrocarbyl group, or or two adjacent R 1 above, carbon atom The groups together may form a fused 5 or 6 membered ring with an Ar group, which ring is itself optionally substituted with one or more R 4 groups; Each R 4 is C 1 -20 hydrocarbyl group is.