Of the Second Transition Series (Y through Ag)

Synthesis of Amido-quinoline Hafnium and Zirconium Complexes with Improved Performances toward Ethylene/1-Octene Copolymerization

“…For such purpose, metallocene and constrained geometry catalysts (CGCs) matching such demands were discovered and have been successfully used for commercial productions of POEs since the early 1990s. − Other alternatives are numerous metal-based catalysts bearing ancillary ligands rather than the cyclopentadienyl (Cp) group that are known as nonmetallocene catalysts. − In particular, NN-bidentate group 4 metal complexes (Scheme ) show high potential as a new generation of homogeneous olefin polymerization catalysts . For example, group 4 metal complexes bearing imino-amido ligands are easy to synthesize from diverse and commercially available α-diimnes (Scheme , A ), showing high activity and producing POEs with high M w s and tunable α-olefin contents .…”