title: Combining hard and soft donors in early-transition-metal olefin polymerization catalysts.
abstract: Bis(phosphanylphenoxide) complexes of the group 4 metals, upon activation by methylaluminoxane, are highly active for ethylene and propylene polymerization; a zirconium derivative possesses one of the highest propylene polymerization activities found to date for a nonmetallocene system.
authors.affiliation: Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Long
authors.forename: Vernon C
authors.initials: VC
authors.lastname: Gibson
authors.forename: Andrew J P
authors.initials: AJ
authors.lastname: White
authors.forename: David J
authors.initials: DJ
authors.lastname: Williams