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- W2071673425 abstract "In the context of developing single-site stereoselective post-metallocene catalysts, the case for isospecific styrene polymerization catalysts based on methylaluminoxane-activated group 4 metal bis(phenolato) complexes is summarized. Ligands derived from the 1,4-dithiabutanediyl-linked bis(phenol)s have been found to induce stereochemical rigidity by the presence of the hemi-labile sulfide donor functions. Isospecific styrene polymerization was achieved using easily accessible catalyst precursors of the type [MX2(OC6H2-tBu2-4,6)2{S(CH2)2S}] (M = Ti, Zr, Hf; X = Cl, OiPr, CH2Ph). Activating the dibenzyl titanium complex [Ti(CH2Ph)2(OC6H2-tBu2-4,6)2{S(CH2)2S}] with B(C6F5)3 and AliBu3, controlled isotactic polymerization became possible at lower temperatures. A remarkable dependence of both the activity and stereoselectivity on the ligand substitution pattern was observed. Analogous precursors with the 1,5-dithiapentanediyl-linked bis(phenolato) ligand gave syndiotactic polystyrene with lower activity." @default.
- W2071673425 created "2016-06-24" @default.
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- W2071673425 date "2004-11-01" @default.
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- W2071673425 title "Stereospecific post-metallocene polymerization catalysts: the example of isospecific styrene polymerization" @default.
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- W2071673425 doi "https://doi.org/10.1016/j.jorganchem.2004.08.019" @default.
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