Quasi-Living trans-1,4-Polymerization of Isoprene by Cationic Rare Earth Metal Alkyl Species Bearing a Chiral (S,S)-Bis(oxazolinylphenyl)amido Ligand

被引：78
|
作者：
Liu, Hui [1 ]
He, Jianyun [1 ]
Liu, Zhanxiong [1 ]
Lin, Zhengguo [1 ]
Du, Gaixia [1 ]
Zhang, Shaowen [1 ]
Li, Xiaofang [1 ]
机构：
[1] Beijing Inst Technol, Dept Chem, Minist Educ, Key Lab Cluster Sci, Beijing 100081, Peoples R China
来源：
MACROMOLECULES | 2013年 / 46卷 / 09期
基金：
中国国家自然科学基金;
关键词：
C-2-SYMMETRIC TRIDENTATE BIS(OXAZOLINE); ETHYLENE-POLYMERIZATION CATALYSTS; COMPLEXES BEARING; STEREOSPECIFIC POLYMERIZATION; OLEFIN POLYMERIZATION; COPOLYMERIZATION; BUTADIENE; MAGNESIUM; ZINC; BIS(THIAZOLINE);
D O I：
10.1021/ma4005549
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A series of chiral mononuclear dialkyl complexes [(S,S)-BOPA]Ln(CH2SiMe3)(2) (1, 2) (BOPA = (S,S)-bis-(oxazolinylphenyl)amido; Ln = Sc (1); Ln = Lu (2)) and binuclear alkyl complexes [o-(S)-OPA-C6H4-(CH2SiMe3)C=N-CH(Pr-i)CH2-O]Ln(CH2SiMe3)}(2) (3, 4) (OPA = (oxazolinylphenyl)amine; Ln = Y (3); Ln = Tm (4)) have been synthesized in moderate yields via one pot acid base reactions by use of the tris(trimethylsilylmethyl) rare earth metal complexes with the chiral tridentate (S,S)-bis(oxazolinylphenyl)amine ligand. In the presence of activator with or without a small amount of (AlBu3)-Bu-i, the dialkyl complexes 1 and 2 exhibit very high activities (up to 6.8 x 10(5) g mol(Ln)(-1)h(-1)) and trans-1,4-selectivity (up to 100%) in the quasi living polymerization of isoprene, yielding the trans-1,4-PIPs with moderate molecular weights (M-n = (0.2-1.0) x 10(5) g/mol) and narrow molecular weight distributions (M-w/M-n = 1.02-2.66).
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收藏
页码：3257 / 3265
页数：9
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