Isoprene Polymerization with Iminophosphonamide Rare-Earth-Metal Alkyl Complexes: Influence of Metal Size on the Regio- and Stereoselectivity

	Isoprene Polymerization with Iminophosphonamide Rare-Earth-Metal Alkyl Complexes: Influence of Metal Size on the Regio- and Stereoselectivity
	Liu, Bo 1,2; Sun, Guangping 2; Li, Shihui 1; Liu, Dongtao 1; Cui, Dongmei 1
刊名	ORGANOMETALLICS
	2015-08-24
卷号	34 期号:16 页码:4063-4068
英文摘要	The protonolysis reaction of beta-iminophosphonamine ligand (NPNdipp = Ph2P((NC6H3Pr2)-Pr-i-2,6)(2)) with one equivalent of rare-earth-metal tris(alkyl)s afforded the corresponding bis(alkyl) complexes NPN(dipp)Ln-(CH2SiMe3)(2)(THF) (Ln = Sc (1), Lu (2), Y (3), Er (4)). The bis(4-methylbenzyl) complexes NPN(dipp)Ln(CH2Ph-4Me)(2)(THF) (Ln = Nd (5), La (6)) were prepared by treatment of the tris(4-methylbenzyl) compounds Ln(CH2Ph-4-Me)(3)(THF)(3) with beta-iminophosphonamine ligand. The small-size rare-earth-metal-based complexes 1-4 upon activation with (AlBu3)-Bu-i and [Ph3C] [B(C6F5)(4)] showed high 3,4-selectivities up to 98.1% for isoprene polymerization. When the larger size rare-earth-metal-based 4-methylbenzyl complexes 5 and 6 were employed instead, moderate 3,4-selectivities were obtained since the opening coordination environment facilitated the 1,4-enchainment (Nd3+: 76.1%; La3+: 62.9%). Replacing (AlBu3)-Bu-i by AlEt3, the 5 and 6 systems exhibited high activity and excellent trans-1,4 selectivity for both isoprene (96.5%, 0 degrees C) and butadiene (92.8%, 20 C) polymerizations.
收录类别	SCI
语种	英语
公开日期	2015-10-27
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/27683]
专题	化学研究所_高分子物理与化学实验室
作者单位	1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Jilin Univ, Dept Mat Sci & Engn, Key Lab Automobile Mat, Minist Educ, Changchun 130025, Peoples R China
推荐引用方式 GB/T 7714	Liu, Bo,Sun, Guangping,Li, Shihui,et al. Isoprene Polymerization with Iminophosphonamide Rare-Earth-Metal Alkyl Complexes: Influence of Metal Size on the Regio- and Stereoselectivity[J]. ORGANOMETALLICS,2015,34(16):4063-4068.
APA	Liu, Bo,Sun, Guangping,Li, Shihui,Liu, Dongtao,&Cui, Dongmei.(2015).Isoprene Polymerization with Iminophosphonamide Rare-Earth-Metal Alkyl Complexes: Influence of Metal Size on the Regio- and Stereoselectivity.ORGANOMETALLICS,34(16),4063-4068.
MLA	Liu, Bo,et al."Isoprene Polymerization with Iminophosphonamide Rare-Earth-Metal Alkyl Complexes: Influence of Metal Size on the Regio- and Stereoselectivity".ORGANOMETALLICS 34.16(2015):4063-4068.