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• W2055494455 abstract "The oxygen-linked bis(phenol) 2-oxapropanediyl-1,3-bis(2-tert-butyl-4-methylphenol), [OOO]H2, was prepared in good yield by the condensation of 2-tert-butyl-6-hydroxymethyl-4-methylphenol at 155 °C. This bis(phenol) reacted cleanly with titanium tetrachloride to give the orange titanium dichloro complex [OOO]TiCl2 in virtually quantitative yield. The solubility in pentane indicates a monomeric structure for [OOO]TiCl2 in solution. The reaction of titanium tetra(isopropoxide) gave the di(isopropoxy) complex [OOO]Ti(OiPr)2 which also adopts a monomeric structure of C2v-symmetry in solution. The reaction of the dichloro complex [OOO]TiCl2 with benzyl Grignard reagent in diethyl ether gave the highly light- and air-sensitive, orange dibenzyl complex [OOO]Ti(CH2Ph)2 in good yield. Single crystal X-ray crystallography revealed a penta-coordinate titanium center coordinated to two monohapto benzyl ligands and the tridentate [OOO] ligand in a meridional fashion. The reaction of zirconium tetrabenzyl with [OOO]H2 gave the bis(ligand) complex [OOO]2Zr, regardless of the stoichiometry employed. Crystallographic analysis shows an octahedral coordination geometry with cis-configuration of the two ligands. The compound can be transformed into the dichloro complex [OOO]ZrCl2 by disproportionation with zirconium tetrachloride. Polymerization tests using [OOO]TiCl2 under methylaluminoxane activation revealed moderate polymerization activity towards ethylene and styrene." @default.
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• W2055494455 date "2003-03-01" @default.
• W2055494455 modified "2023-10-12" @default.
• W2055494455 title "Titanium and zirconium complexes that contain a tridentate bis(phenolato) ligand of the [OOO]-type" @default.
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• W2055494455 doi "https://doi.org/10.1016/s0020-1693(02)01289-6" @default.
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