Effect of ligand substituents in olefin polymerisation by half-sandwich titanium complexes containing monoanionic iminoimidazolidide ligands–MAO catalyst systems
作者:Kotohiro Nomura、Hiroya Fukuda、Shohei Katao、Michiya Fujiki、Hyun Joon Kim、Dong-Hyun Kim、Shu Zhang
DOI:10.1039/c1dt10467e
日期:——
Various half-sandwich titanium complexes containing iminoimidazolidide ligands, CpTiCl2[1,3-R2(CH2N)2CN] (1aâd) [R = Ph (a), 2,6-Me2C6H3 (b), cyclohexyl (c), tBu (d)], have been employed as the catalyst precursors for ethylene polymerisation, syndiospecific styrene polymerisation, and copolymerisation of ethylene with 1-hexene in the presence of MAO cocatalyst; 1d showed the highest catalytic activity for ethylene polymerisation whereas 1b showed the highest activity for syndiospecific styrene polymerisation.
含亚胺基咪唑啉酮配体的各类半夹心钛配合物,CpTiCl2[1,3-R2(CH2N)2CN] (1a-d) [R=苯基(a),2,6-二甲基苯(b),环己基(c),叔丁基(d)],已被用作乙烯聚合、间同规聚合苯乙烯及在MAO助催化剂存在下乙烯与1-己烯共聚的催化剂前体;对于乙烯聚合,化合物1d显示最高的催化活性,而对于间同规聚合苯乙烯,化合物1b显示最高的活性。