Ti(N C t Bu 2)3 Cl(1)与TlPF 6在乙腈中反应,得到[Ti(N C t Bu 2)3(N⋮CCH 3)] PF 6(2),证明是不稳定的,并且在室温下以溶液或固态分解。尝试重结晶2从CH 2氯2导致钛[Ti /己烷混合物3(N c ^吨卜2)6(μ 2 -F)3(μ3 -F)2 ] [PF 6 ](3)。用LiMe和PhCH 2 MgCl处理1分别得到化合物Ti(N C t Bu 2)3 CH 2 Ph(4)和Ti(N C t Bu 2)3 Me(5)。4用B(C处理6 ˚F 5)3,得到钛[Ti(N c ^吨卜2)3(CH 2 PH)B(C 6 ˚F5)3 ](6),它存在于溶液为在两种物质的混合物,所述两性离子钛[Ti(N c ^吨卜2)3 ] [(μ-CH 2 PH)B(C 6 ˚F 5)3 ](6A)和溶剂化物阳离子[Ti(N C t Bu 2)3(溶剂)] [(CH
Titanium and zirconium ketimide complexes: synthesis and ethylene polymerisation catalysis
摘要:
The syntheses of ketimide titanium complexes of the type Ti(N=C'Bu-2)(3)X (X = Cl, CP, Ind), Ti(N=C'Bu-2)(4) and the zirconium complex CpZr(N=C'Bu-2)(2)Cl are described. When activated by MAO, all compounds are ethylene polymerisation catalysts. In the conditions studied, the most active catalyst is CpZr(N=C'Bu-2)(2)Cl, with an activity of 2.7 x 10(5) kg/(molZr [E] h). Titanium complexes are less active by about two orders of magnitude. The polyethylene produced is linear, as determined by NMR spectroscopy. Molecular structures of Ti(N=C'Bu-2)(3)X (X = Cl, Cp, Ind) and Ti(N=C'Bu-2)(4) were determined by X-ray single crystal diffraction. (C) 2004 Elsevier B.V. All rights reserved.