1,2-Azaborolyl-Ligated Titanium(IV) Half-Metallocenes: Synthesis, Characterization, and Catalytic Activity in Ethylene Polymerization
作者:Yang Chen、Xiangdong Fang、Wenyan Dan
DOI:10.1021/acs.organomet.5b00779
日期:2016.1.11
The synthesis and characterization of 1,2-azaborolyl (Ab)-ligated titanium(IV) half-metallocene complexes are presented, and their catalytic properties in ethylene polymerization have been evaluated. Mono-Ab TiCl3 complexes 3 and 4 can be conveniently converted to other half-metallocene derivatives (5-8) in moderate to good yields. The molecular structures of titanium complexes 3-8 have been determined by X-ray diffraction analysis. Upon activation with methylaluminoxanes (MAO), mono-Ab Ti half-metallocenes demonstrated high catalytic activity in ethylene polymerization (1.50 X 10(7) g of PE (mol of Ti)(-1) h(-1)) at a low [MAO] (Al:Ti = 30)