ИСТИНА

The present invention relates to compounds according to formula I wherein: • each R1-R10 may individually be H, a halogen, an alkoxy moiety, a siloxy moiety, a nitrogen-containing moiety, an alkyl moiety, an aryl moiety, or an aralkyl moiety, wherein each R1-R10 comprises ≤ 10 carbon atoms, wherein each of R1-R10 may form a cyclic moiety with an adjacent R1-R10 moiety; • Y is O or N-R11, wherein R11 is an alkyl, cycloalkyl, aryl or aralkyl moiety comprising 1-12 carbon atoms; • M is a group 3 or 4 transition metal, preferably Ti, Zr or Hf, more preferably Ti; • X is • a sigma-bonded ligand, for example: (i) a halogen, (ii) an amine, or (iii) a moiety wherein each X may contain 1 to 10 carbon atoms, selected from an alkyl moiety, an aralkyl moiety, an alkoxy moiety, and an aryloxy moiety; or • a diene, for example a butadiene moiety or an isoprene moiety; • z is the number of ligands X that are bonded to M. Such compounds may be used in a catalyst system for olefin polymerisation, particularly ethylene copolymerisation, providing at least one of a high catalyst activity, a high comonomer incorporation, and/or a high molecular weight polymer.