Highly 3,4-Selective Living Polymerization of Isoprene and Copolymerization with epsilon-Caprolactone by an Amidino N-Heterocyclic Carbene Ligated Lutetium Bis(alkyl) Complex

	Highly 3,4-Selective Living Polymerization of Isoprene and Copolymerization with epsilon-Caprolactone by an Amidino N-Heterocyclic Carbene Ligated Lutetium Bis(alkyl) Complex
	Yao, Changguang ; Liu, Dongtao ; Li, Ping ; Wu,Chunji ; Li,Shihui ; Liu,Bo ; Cui,Dongmei
刊名	organometallics
	2014
卷号	33 期号:3 页码:684-691
关键词	STEREOSPECIFIC POLYMERIZATION 1 TRIBLOCK COPOLYMERS BLOCK-COPOLYMERS METAL-COMPLEXES MONOMER COPOLYMERIZATION DIENE POLYMERIZATION CONJUGATED DIENES ALKYL COMPLEXES POLAR MONOMERS 3-DIENE POLYMERIZATION
通讯作者	cui,dm
英文摘要	the amidino-modified n-heterocyclic carbene ligated lutetium bis(alkyl) complex 1, (am-nhc)lu(ch2sime3)(2), was synthesized by treatment of (amh-nhc-h)br ((2,6-(prc6h3n)-pr-i=c(c6h5)nhch2ch2(nchchn(c6h2me3-2,4,6)ch)br) with ((trimethylsilyl)methyl)lithium (lich2sime3) and lutetium tris(alkyls) (lu(ch2sime3)(3)(thf)(2)) via double-deprotonation reactions and characterized by nmr spectroscopy and x-ray diffraction analysis. under activation of an organoborate, complex 1 exhibited distinguished catalytic performance for the polymerization of isoprene with respect to high activity, 3,4-regioselectivity (99.3%), and livingness mode. in contrast to the systems reported to date, this system seemed not to be affected obviously by the polymerization temperature (0-80 degrees c), solvents, monomer-to-initiator ratios (500-5000), and type of organoborate. the resultant polymers have high glass-transition temperatures (38-48 degrees c) and moderate syndiotacticity (racemic enchainment triad rr 45%, pentad rrrr 20%). in addition, the living lutetium-polyisoprene active species could further initiate the ring-opening polymerization of epsilon-caprolactone to give selectively the poly(3,4-isoprene)-b-polycaprolactone :block copolymers with controllable molecular weight (from 4.9 x 10(4) to 10.2 x 10(4)) and narrow polydispersity.
收录类别	SCI
语种	英语
WOS记录号	WOS:000331341900014
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/57205]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Yao, Changguang,Liu, Dongtao,Li, Ping,et al. Highly 3,4-Selective Living Polymerization of Isoprene and Copolymerization with epsilon-Caprolactone by an Amidino N-Heterocyclic Carbene Ligated Lutetium Bis(alkyl) Complex[J]. organometallics,2014,33(3):684-691.
APA	Yao, Changguang.,Liu, Dongtao.,Li, Ping.,Wu,Chunji.,Li,Shihui.,...&Cui,Dongmei.(2014).Highly 3,4-Selective Living Polymerization of Isoprene and Copolymerization with epsilon-Caprolactone by an Amidino N-Heterocyclic Carbene Ligated Lutetium Bis(alkyl) Complex.organometallics,33(3),684-691.
MLA	Yao, Changguang,et al."Highly 3,4-Selective Living Polymerization of Isoprene and Copolymerization with epsilon-Caprolactone by an Amidino N-Heterocyclic Carbene Ligated Lutetium Bis(alkyl) Complex".organometallics 33.3(2014):684-691.