Inorganic Chemistry, Vol.45, No.2, 511-513, 2006
Combining hard and soft donors in early-transition-metal olefin polymerization catalysts
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.