Donor–Acceptor Metallocene Catalysts for the Production of UHMW‐PE: Pushing the Selectivity for Chain Growth to Its Limits

Plastic fantastic! Donor–acceptor zirconocenes with a donor (P)-substituted fluorenyl ligand and an acceptor (B)-substituted cyclopentadienyl ligand (see structure) are highly active ethylene polymerization catalysts that reveal an ultrahigh selectivity for chain propagation even at high temperatures, giving access to ultrahigh-molecular-weight polyethylenes (viscosity-average molecular weights Mη>1×106 g mol−1). Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z504173_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.