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• W2318881486 abstract "The reaction of Zr(CH2Ph)4 with the pyridine alcohols 6-pyCR1R2OH (2a, R1 = R2 = CF3; 2b, R1 = R2 = Me; 2c, R1 = H, R2 = CF3) yields dibenzyl complexes (pyCR1R2O)2Zr(CH2Ph)2 (3a−c). These species adopt distorted octahedral structures with a trans-O, cis-N, cis-C ligand arrangement but undergo rapid inversion of configuration at Zr on the NMR time scale, with racemization barriers in the range from 8.6 (3b) to 10.1 (3c) kcal/mol. 3a and 3b react with B(C6F5)3 to yield [(pyCR1R2O)2Zr(CH2Ph)][PhCH2B(C6F5)3] (6a,b) and with [HNMe2Ph][B(C6F5)4] to yield [(pyCR1R2O)2Zr(CH2Ph)][B(C6F5)4] (7a,b). NMR spectra indicate that 6a,b and 7a,b are not strongly ion-paired in CD2Cl2. 6a polymerizes ethylene and 1-hexene to low molecular weight polymers. [{pyCH(CF3)O}2Zr(CH2Ph)][PhCH2B(C6F5)3] (6c, generated in situ) is much less active for ethylene polymerization than 6a, and 6b is inactive." @default.
• W2318881486 created "2016-06-24" @default.
• W2318881486 creator A5058003131 @default.
• W2318881486 creator A5067347706 @default.
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• W2318881486 date "1997-07-01" @default.
• W2318881486 modified "2023-10-16" @default.
• W2318881486 title "Neutral and Cationic Zirconium Benzyl Complexes Containing Bidentate Pyridine−Alkoxide Ligands. Synthesis and Olefin Polymerization Chemistry of (pyCR₂O)₂Zr(CH₂Ph)₂ and (pyCR₂O)₂Zr(CH₂Ph)⁺ Complexes" @default.
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• W2318881486 doi "https://doi.org/10.1021/om9702439" @default.
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