Donor complexes of bis(1-indenyl)phenylborane dichlorozirconium as isospecific catalysts in propene polymerization

Chiral boron-bridged ansa-type zirconocenes can be prepared in a few simple steps; various donor molecules such as Et2O, THF or PMe3 undergo complexation at boron leading to catalysts having vastly different catalytic properties in Ziegler–Natta polymerization of propene; the PMe3-containing catalyst is the most active and stereoselective (96% isotacticity).