Catalytic Activities for Olefin Polymerization: Titanium(III), Titanium(IV), Zirconium(IV), and Hafnium(IV) beta-Diketiminato, 1-Aza-1,3-butadienyl-Imido, and 1-Aza-2-butenyl-Imido Complexes Bearing an Extremely Bulky Substituent, the Tbt Group (Tbt=2,4,6-[(Me3Si)(2)CH](3)C6H2)

Hamaki H; Takeda N; Nabika M; Tokitoh N

Macromolecules, Vol.45, No.4, 1758-1769, 2012

DOI10.1021/ma2024107 Export Citation

Catalytic Activities for Olefin Polymerization: Titanium(III), Titanium(IV), Zirconium(IV), and Hafnium(IV) beta-Diketiminato, 1-Aza-1,3-butadienyl-Imido, and 1-Aza-2-butenyl-Imido Complexes Bearing an Extremely Bulky Substituent, the Tbt Group (Tbt=2,4,6-[(Me3Si)(2)CH](3)C6H2)

Hamaki H, Takeda N, Nabika M, Tokitoh N

beta-Diketiminato and 1-aza-1,3-butadienyl-imido complexes [MCl3{TbtNC(Me)CHC(Me)NMes}(thf)(n)] (1a, 1b, 1c) and [M(=NTbt)Cl-2{C(Me) CHC(Me)NMes}Li-(tmeda)] (3a, 3b, 3c) (M = Ti, Zr, Hf) bearing an extremely bulky substituent, Tbt group (Tbt = 2,4,6-[(Me3Si)(2)CH](3)C6H2) showed high activities for ethylene polymerization and ethylene/1-hexene copolymerization (up to 1.1 X 10(7) g of polymer.mol M-1 h(-1)). Complexes 1a, 1b, 3a, 3b, and 3c could produce ultrahigh molecular weight ethylene/1-hexene copolymers (M-w > 4 X 10(6)) that were hardly soluble in o-dichlorobenzene under the molecular weight measurement conditions.