ansa-metallocene complexes of type (C13H8-SiR2-C9H6-nRn ')ZrCl2 (n = 0, 1; R = Me, Ph, alkenyl; R ' = alkyl, alkenyl): self-immobilizing catalysts precursors for ethylene polymerization [German]

摘要

Twenty-four (19 new) ansa-metallocene complexes of the type (C13H8-SiR2-C9H6-nRn')ZrCl2 (n = 0, 1; R = Me, Ph, alkenyl; R' = alkyl, alkenyl) have been synthezised, characterized and tested for catalytic ethylene polymerization after activation with methylaluminoxane (MAO). The substituents R in the bridge and the substituents R' in the 3-position of the indenylidene moiety have an influence on the activity of the catalysts and the molecular weights of the formed polymers. The omega-alkenyl substituents R and R' allow the copolymerization of the corresponding catalysts with the monomer upon activation to give heterogeneous catalysts by self-immobilization processes. [References: 25]