Synthesis of mono- and bis- benzimidazolin-2-iminato titanium complexes and their catalytic performances in ethylene homo- and co- polymerizations

Polymerization of α-olefins and their copolymerization with ethylene by half-sandwich scandium catalysts with an N-heterocyclic carbene ligand

“…The development of efficient catalysts for the polymerization of α-olefins and their copolymerization with ethylene to synthesize high-performance polyolefins has been the subject of intense scrutiny in both academic and industrial research. [1][2][3][4][5] The fine-tuning of the stereo-electronic properties of the ancillary ligands in homogeneous catalysts proved to be a key tool for controlling the reactivity and catalytic performances. [6][7][8][9][10] The most extensively investigated catalysts for the polymerization of α-olefins and their copolymerization with ethylene are group 4 metallocene catalysts, 2,4,10-17 constrained geometry catalysts (CGC), 3,6,7,18 and post-metallocene catalysts.…”

“…[6][7][8][9][10] The most extensively investigated catalysts for the polymerization of α-olefins and their copolymerization with ethylene are group 4 metallocene catalysts, 2,4,10-17 constrained geometry catalysts (CGC), 3,6,7,18 and post-metallocene catalysts. 5,8,9,[19][20][21][22] Rare-earth metal catalysts have attracted a great deal of attention during the past two decades due to their unique catalytic performance in a variety of polymerization reactions of compounds such as ethylene, styrene, 1,3-conjugated dienes, polar monomers, etc. [23][24][25][26][27][28] However, most of these rare-earth metal catalysts usually show low activity or an irreversible chain termination reaction (such as β-H elimination) in α-olefin polymerization, only affording polymers with low molecular weight.…”