| abstract |
"MIXED METALLIC CATALYSTS" Composition containing (i) a sustained or unsustained magnesium / titanium based catalyst precursor including an electron donor and (ii) a lanthanide catalyst precursor represented by the following formula: Cp ~ a ~ LnR ~ b ~ L ~ c ~ where Cp is a cyclopentadienyl or substituted cyclopentadienyl ligand; Ln is a lanthanide metal; R is a hydride, alkyl, silyl, halide, or aryl group; L is an electron donor; a + b is the valence of the lanthanide metal; and <MU> c <MV> is a sufficient amount of electron donor to stabilize the lanthanide metal. |