Synthesis, characterization, and catalytic activities in syndiospecific polymerization of styrene for half-sandwich titanium complexes with non-Cp tridentate dianionic ligands MeN(CH2CR2O−)2

Trapping Molecular SnBr2(OH)2 by Tin Alkoxide Coordination: Syntheses and Molecular Structures of [MeN(CH2CMe2O)2SnBr2]2·SnBr2(OH)2 and RN(CH2CMe2O)2SnL [R = Me, n‐Octyl; L = Lone Pair, Cr(CO)5, W(CO)5, Fe(CO)4, Br2]

“…N ‐Methylbis(2‐methyl‐2‐propanol)amine: Methylamine (7.54 g, 40 % aqueous solution, 0.242 mol) was mixed with isobutylene oxide (37.05 g, 0.514 mol) and heated at reflux for 24 h 19. The reaction mixture was extracted with diethyl ether, then the organic layer was dried with MgSO 4 and filtered.…”

“…N ‐Octylbis(2‐methyl‐2‐propanol)amine: n ‐Octylamine (65.00 g, 0.502 mol) and isobutylene oxide (72.50 g, 0.502 mol) were heated at 100 °C for 24 h and at 130 °C for an additional 24 h in a pressure vessel with a grease‐free Teflon valve (Fa. Young) 19. The product was isolated in quantitative yield as a colorless viscous liquid (137.00 g, 0.501 mol) and was used in the next step without further purification.…”

The amino alcohol MeN(CH2CMe2OH)2

“…The synthesis and the chemical and physical properties of the title compound were published by Hong et al (2008). The latter crystallizes from the melt as colourless column-shaped crystals.…”

Transition metal complexes bearing tridentate ligands for precise olefin polymerization

“…2.1-23.3 × 10 6 g mol −1 h −1 for the syndiospecific polymerization of styrene after activation with MAO. 127 The activity decreased with the decreasing electron density of the metal centers of these catalysts as follows 132k (1.1 × 10 7 g mol −1 h −1 ) > 132j (7.3 × 10 6 g mol −1 h −1 ) > 132l (2.1 × 10 6 g mol −1 h −1 ) at 50 °C and 132j (2.7 × 10 7 g mol −1 h −1 ) > 132k (1.5 × 10 7 g mol −1 h −1 ) > 132l (9.4 × 10 6 g mol −1 h −1 ) at 70 °C and 132j (2.3 × 10 7 g mol −1 h −1 ) > 132k (1.7 × 10 7 g mol −1 h −1 ) > 132l (1.2 × 10 7 g mol −1 h −1 ) at 90 °C. Moreover, the activities of the 132j-l/MAO systems increased with the increasing temperature of polymerization up to 90 °C, indicating that the tridentate chelating ligands with steric hindrance seemed to stabilize the active species and exhibited thermal stability at high polymerization temperatures.…”