Novel titanium (IV) diolate complexes: Synthesis, structure and catalytic activities in ultra-high molecular weight polyethylene production

Olefin polymerization behavior of titanium(IV) alkoxo complexes with fluorinated diolate ligands: The impact of the chelate ring size and the nature of organoaluminum compounds

“…Similarly to previously published titanium complexes with diolate ligands, [8,9] complexes 3b and 3d display rather low catalytic activity and yielded only trace amounts of the polyethylene in the presence of alkylalumoxanes (MAO), alkylaluminum chlorides (…”

“…The NMR spectra were recorded on Bruker Avance-400 spectrometer. Deuterated solvents (CDCl 3, THF-d 8 ) were degassed by freeze-pump-thaw vacuum cycles and stored over 3 Å molecular sieves. Chemical shifts are reported in ppm and are referenced to the residual solvent peaks.…”

Mono- and di-anionic coordination modes of arylazosalicylates in their bis(η5-cyclopentadienyl)titanium(IV) complexes: Syntheses and crystal structures

“…In spite of the rich chemistry and diverse biological applications of titanocene and titanium(IV) based compounds, the synthetic methodologies are not well established (vide infra) and the number of isolated and structurally characterised titanocene salicylates is scarce. As anticipated, both unsubstituted derivatives, bis(η 5 [50], with a chelating dianion, have been described. Compound 1 has been synthesised by treating Cp 2 TiCl 2 with sodium salicylate (1:2 molar ratio) in water containing acetylacetone wherein the role of the latter reagent is not known [49].…”

“…Organometallic and coordination titanium(IV) compounds are of interest due to their reactivity and uses including as reagents for catalytic enantioselective processes [1], organic transformations [2], as initiators for polymerization reactions [3], polymerisation catalysts [4][5][6][7][8][9][10] to metal organic frameworks [11][12][13] and metallo-supramolecular chemistry [14][15][16][17][18][19]. Other applications include the use of alkoxides or aryloxides precursors for the generation of titaniumbased materials [20][21][22][23][24][25][26] and their uses as photo-sensitisers and photo-catalysts [27,28], titaniumbased drugs [29][30][31][32][33][34][35][36][37][38][39] and cell imaging [40][41].…”

Facile Investigation of Ti3+ State in Ti-based Ziegler-Natta Catalyst with A Combination of Cocatalysts Using Electron Spin Resonance (ESR)

“…Although metallocene catalyst is an effective catalyst, it only shows enhancement of 1-olefins insertion in polymer chain without increasing catalytic activity [6]. In industrial scale, the metallocene catalysts can be used in ethylene polymerization [7], but the polymerization system is more sensitive and it requires large amounts of cocatalyst, such as: methylalumoxane (MAO) [5,8,9]. It is necessary to rely on more suitable catalyst for improving properties of polymer and easy control of the catalytic system.…”