The synthesis, structure and catalytic activity of mono(salicylaldiminato) titanium complexes

Abstract

Reaction between 3-But-2-(OSiMe3)C6H3CH=N(2,6-R2C6H3) (where R = H (1a) or Pri (1b)) and TiCl4(THF)2 affords the octahedral complexes Ti{3-But-2-(O)C6H3CH=N(2,6-R2C6H3)}Cl3(THF) while in the absence of THF 1b reacts with TiCl4 to give the binuclear complex [Ti{3-But-2-(O)C6H3CH=N(2,6-Pri2C6H3)}Cl(µ–Cl)3TiCl3]; the complexes give good productivities for ethene polymerisation when activated with MAO

Is imatinib mesylate a promising drug in systemic sclerosis?

“…Unsymmetric heteroligated catalysts 3a –c were synthesized via the improved procedure of the literature depicted in Scheme 36, 37. All the complexes were well soluble in toluene, dichoromethane, and tetrahydrofuran.…”

“…Considering that pentafluorinated FI catalyst exhibits both high activity and living polymerization feature, whereas bis(β‐enaminoketonato)titanium catalysts display not only high activities but also promising ability to copolymerize ethylene with α‐olefins or cycloolefins,32–39 we chose “living” pentafluorinated phenoxy‐imine ligands 3‐Bu t ‐2‐(OH)C 6 H 3 CHN(C 6 F 5 ) and one β‐enaminoketone ligand ( p ‐XC 6 H 4 )NC(Bu t )CHC (CF 3 )OH with sterically more open structures to synthesize new heteroligated catalysts (Scheme ). In this contribution, we describe the synthesis, the structure, ethylene polymerization and ethylene/norbornene copolymerization behaviors of the heteroligated titanium catalysts.…”

2-Aldiminophenoxytitanium chloride complexes: Synthesis, characterization, and ethylene (co-)polymerization behavior

“…temperatures (runs 12, 18e22). The current complex pre-catalysts did not perform as well as the advanced FI pre-catalysts [26], but the activity (4.26e11.62 Â 10 5 g mol À1 (Ti) h À1 at 70 C) was generally considered better than those of analog titanium monosalicy(aldiminato) complexes [72,73]. It is noteworthy that the sensitive complex C6 had to be used fresh, and immediately recrystallized prior to catalytic screening.…”

Non-Cp type homogeneous catalytic systems for olefin polymerization

“…FI catalysts show outstanding polymerization behavior toward various monomers. The coupled use of 66 with MAO showed metal dependant activities ranging from several thousands kg PE/(mol h atm) for Zr [168][169][170][171][172][173][174] to several tens of thousands kg PE/(mol h atm) for Ti [175][176][177][178][179][180][181][182]. In particular, titanium complex of 66 with fluorinated phenyl group at R 3 position was found not only to catalyze living polymerization of ethylene but also to produce polyethylene with multimodal molecular weight distribution [175][176][177][178][179][180][181][182].…”

“…The coupled use of 66 with MAO showed metal dependant activities ranging from several thousands kg PE/(mol h atm) for Zr [168][169][170][171][172][173][174] to several tens of thousands kg PE/(mol h atm) for Ti [175][176][177][178][179][180][181][182]. In particular, titanium complex of 66 with fluorinated phenyl group at R 3 position was found not only to catalyze living polymerization of ethylene but also to produce polyethylene with multimodal molecular weight distribution [175][176][177][178][179][180][181][182]. In addition, FI catalysts are also active for syndiotactic living polymerization of propylene, ethylene/propylene copolymerization and polymerization of 1-hexene as well as conjugated diene [183][184][185][186][187][188][189][190][191].…”