Stereochemical Control Mechanisms in Propylene Polymerization Reactions with Fluorenyl Containing Single Site Catalysts

摘要

The stereochemistry of propylene insertion / propagation reactions with a variety of Cs and C_1 symmetric,fluorenyl containing single site catalysts is discussed.Recent results indicate that independent of the chemical composition of the ancillary ligand fragments,chirotopic active sites with a local Cs symmetry and two enantio-topic coordination positions,in the general context of chain migratory insertion mechanism,behave syndioselectively.