Ancillary Ligand Effects in Chiral C₁-Symmetric ansa-Metallocene Catalysts for Stereoregular α-Olefin Polymerization. “Wingspan” Modification with Octahydrofluorene

The synthesis and activity as precatalysts for stereoregular α-olefin polymerization of the chiral C 1 -symmetric zirconocene complexes ( R )- and ( S )-Me 2 Si(η 5 -C 13 H 16 )(η 5 -C 5 H 3 R*)ZrR 2, where C 13 H 16 = octahydrofluorenyl, R = NMe 2, Cl, or Me, and R* = (1 R,2 S,5 R )- trans -5-methyl- cis -2-(2-propyl)cyclohexyl ((−)-menthyl), are described.