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- W2890603463 abstract "The dichloro titanium complexes (OSSO tBu)TiCl2 (1) and (OSSOCum)TiCl2 (2) bearing o-phenylene-bridged OSSO-type ligands [OSSO tBu-H = 6,6'-((1,2-phenylenebis(sulfanediyl))bis(methylene))bis(2,4-di-tert-butyphenol) and OSSOCum-H = 6,6'-((1,2-phenylenebis(sulfanediyl))bis(methylene))bis(2,4-bis(2-phenylpropan-2-yl)phenol)] were prepared and characterized. The X-ray structure of 1 revealed that Ti atom has an octahedral coordination geometry with an fac-fac wrapping of the [OSSO] ligand. In solution at 25 °C, 1 mainly retains the C2 symmetric structure, whereas 2 shows an equilibrium between C2- and C1-symmetric stereoisomers. Activation of 2 with (Ph3C)[B(C6F5)4] led to a highly active catalytic system with an activity of 238 kgPE·molcat-1·bar-1·h-1; linear polyethylene with a Tm of 122 °C and Mw of 107 kDa were obtained under these conditions. Catalyst 1 displayed the moderate activity of 59 kgPE·molcat-1·bar-1·h-1. Gel permeation chromatography analysis revealed the formation of high-molecular-weight polyethylenes with very large distributions of the molecular weights, indicating a low control of the polymerization process, probably becaue of the presence of different active species in solution. Density functional theory investigation provides a rational for the relative high-molecular-weight polymers obtained with these complexes. The precatalyst 2 was also active in propylene polymerization producing atactic oligomers terminated with unsaturated end groups." @default.
- W2890603463 created "2018-09-27" @default.
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- W2890603463 date "2018-09-21" @default.
- W2890603463 modified "2023-10-14" @default.
- W2890603463 title "Phenylene-Bridged OSSO-Type Titanium Complexes in the Polymerization of Ethylene and Propylene" @default.
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- W2890603463 doi "https://doi.org/10.1021/acsomega.8b01550" @default.
- W2890603463 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6645219" @default.
- W2890603463 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31459259" @default.
- W2890603463 hasPublicationYear "2018" @default.
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