CYCLOPENTADIENE COMPOUND WHEREIN TWO OR THREE HETERO ATOMS ARE PRESENT IN THE SUBSTITUENTS

摘要

Substitued cyclopentadiene compound wherein two or three hetero atoms chosen from group 15 or 16 of the Periodic System are present in the substituents, wherein preferably at least one substituent is of the form -RDR'n, wherein R is a bonding group between the cyclopentadiene compound and the DR'n group, D is a hetero atom chosen from group 15 or 16 of the Periodic System of the Elements, R' is a substituent and n is the number of R' groups bonded to D. Metal complexes in which at least one of these cyclopentadiene compounds is present as a ligand are useful as catalysts for the polymerisation of alpha-olefins.