Diastereomerically-Specific Zirconium Complexes of Chiral Salan Ligands:Isospecific Polymerization of 1-Hexene and 4-Methyl-1-pentene and Cyclopolymerization of 1,5-Hexadiene

摘要

Chirality is an essential requirement of isospecific polymerization catalysts of alpha-olefins that operate by an enantiomorphic-site control mechanism.While conventional polymerizations employ racemic catalysts,there are several notable exceptions in which enantio-merically pure catalysts are required.These include the chiral Cyclopolymerization of 1,5-hexadiene,chiral oligomerization,and kinetic resolution via polymerization.