{[2-(Dimethylamino)ethyl]cyclopentadienyl}trichlorotitanium: A New type of Olefin Polymerization Catalyst

Imines in the Titanium Coordination Sphere: Highly Reactive Titanaaziridines and Larger Titanacycles Formed by Subsequent C–C Coupling Reactions

“…The used solvents were dried with common drying agents and freshly distilled under nitrogen before use. Cp 2 TiCl 2 , [42] Cp* 2 TiCl 2 , [43] CpTiCl 3 , [44] Cp*TiCl 3 , [45] and Cp N TiCl 3 [46] were synthesized according to literature procedures. The X-ray data were obtained with a Bruker Apex II CCD diffractometer by using graphite-monochromated Mo-K α radiation (λ = 0.71073 Å).…”

Group 4 Metallocene Catalysts with Hapto-Flexible Cyclopentadienyl-Aryl Ligand

“…The solvent was removed under vacuum, to yield 16.4 g of an orange oil. 1 Preparation of LTiCl 3 6.9 mmol of the ligand were dissolved in 80 mL of heptane and cooled at -78 8C, then, butyllithium (6.9 mmol) in hexane was added dropwise. The reaction mixture was allowed to warm to room temperature and kept for 2 h under stirring, then was added to a solution of 6.9 mmol of TiCl 4 in 80 mL of hexane at -78 8C.…”

“…Yield 300 mg of a "orange-brown" solid. 1 Communication: Catalytic precursors Ti(IV) and Zr(IV) complexes bearing cyclopentadienyl and substituted cyclopentadienyl anionic ligands, bonded to phenyl or substituted phenyl through an isopropylidene bridge have been utilized in the polymerization of propene and styrene and in ethylene-styrene copolymerization. In the presence of trichloro[(1,2,3,4,5-g)-1-(1-methyl-1-phenylethyl)-2,4-cyclopentadien-1-yl]titanium (LTiCl 3 ) we have obtained either partially isotactic (chain-end type) or atactic poly-(propylene), and either atactic or syndiotactic polystyrene depending on the reaction temperature.…”

“…Evaporation of the solvent yielded a brown oil that was washed with heptane, obtaining 1.83 g of a "orange-brown" solid. 1 …”

“…[1] This catalytic system promotes syndiotactic polymerization of styrene at 50 8C, but at subambient temperature (e. g., 0 8C) is barely active and only produces a small amount of atactic polystyrene. The explanation suggested by Chien is that, at low temperature, the phenyl substituent of the ligand is intramolecularly coordinated to the titanium cation, thus preventing syndiospecific polymerization of styrene, as implied by the reaction mechanism proposed by some authors.…”