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- W2000324222 abstract "Ligands (C13H9)(2,6-R2C6H3NH)SiPh2 [R = iPr (2a), Me (2b)] were synthesized by single deprotonation of the amino group in 2,6-dialkylanilines with n-BuLi at −78°C followed by reaction with fluorenyl diphenyl silyl chloride [FluSi(Ph2)Cl]. Single crystal X-ray diffraction studies revealed different geometries around the nitrogen atom for the two compounds. Titanium and zirconium complexes (3a–3d) were prepared by double deprotonation of the ligands with n-butyl lithium (n-BuLi) followed by reaction with the respective metal chlorides, MCl4 (THF) 2. Polymerization of ethylene was performed using these complexes as catalyst precursors along with methylaluminoxane (MAO) as an activator at 5 bar pressure. Complexes 3a–3d/MAO exhibited moderate catalyst activities for polymerization of ethylene and resulted in high molecular weight linear poly(ethylene)s (Mv > 4 × 105 g/mol). Catalyst activities were much lower when compared to similar N-alkyl substituted complexes presumably due to the resonance effect of the aromatic group on the amido nitrogen. POLYM. ENG.SCI., 2011. © 2011 Society of Plastics Engineers" @default.
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- W2000324222 date "2011-10-01" @default.
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- W2000324222 title "Polymerization of ethylene using amido functional half-sandwich complexes of group 4 metals" @default.
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- W2000324222 doi "https://doi.org/10.1002/pen.22132" @default.
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