Indenyl compounds for the polymerization of olefins

The invention relates to indenyl compounds that can be used as catalyst component for the polymerisation of olefins. The invention also relates to a process for the polymerisation of olefins, using indenyl compounds. Such indenyl compounds are for instance known from WO-A-94/11406. Indenyl compound of formula (1) wherein:M is a transition metal from the lanthanides or from group 3, 4, 5 or 6 of the Periodic System of Elements,Q is an anionic ligand to M,k is the number of Q groups,R is a bridging groupand Z and X are substituents, wherein R contains at least one sp2-hybridized carbon atom that is bonded to the indenyl group at the 2-position with the exclusion of Ti(deshydronorbiphenacene) dichloride.