Of the Second Transition Series (Y through Ag)

Canich, J. M.; Gard, Gary L.

doi:10.1002/9780470145180.ch174

Cited by 1 publication

(1 citation statement)

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“…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 .…”

Section: Introductionmentioning

confidence: 99%

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

Zhang,

Liu

et al. 2024

Organometallics

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A cost-effective and straightforward route has been developed to synthesize amidoquinoline-supported hafnium and zirconium complexes. The new Hf (Hf1−Hf4) and Zr (Zr1) complexes show high thermal stability, high activity, and excellent 1-octene incorporation capability, and thus have been successfully employed in high-temperature solution-phase polymerization to prepare polyolefin elastomers (POEs). It is interesting that both the activity and the 1-octene incorporation by the Hf complex are much higher than those by the Zr analogue bearing the same ligand under otherwise identical conditions, revealing a significant metal center effect on catalytic performances. Moreover, the nature of the ligands also greatly influences the catalysis, and those with electron-donating substituents are favorable for copolymerization. In particular, the Hf complex (Hf1) with i Pr-substituents shows an activity as high as 78150 kg(POE)•mol −1 (Hf)•h −1 toward ethylene/1-octene copolymerization at 120 °C and produces POE with a high molecular weight (M w = 20.2 × 10 4 g•mol −1 ), narrow distribution (Đ = 2.2), and high incorporation of 1-octene (49.6 mol %).

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