Half-metallocene complexes of yttrium with amidinate ligands: Monoalkyl yttrium formation and C-H bond activation

被引：3

作者：

Xu, Tie-Qi ^{[1
]}

Liu, Jun-Hu ^{[1
]}

Liu, Yong ^{[1
]}

机构：

[1] Dalian Univ Technol, Coll Chem, State Key Lab Fine Chem, Dalian 116024, Peoples R China

来源：

POLYHEDRON | 2016年 / 113卷

基金：

中国国家自然科学基金;

关键词：

Yttrium complex; Amidinate ligand; Polymerization; C-H bond activation; Catalyst; EARTH-METAL COMPLEXES; GROUP-TRANSFER POLYMERIZATION; STYRENE-STYRENE SEQUENCES; STEREOSELECTIVE POLYMERIZATION; DIBLOCK COPOLYMERS; CATALYSTS; SCANDIUM; ETHYLENE; ALKYL; POLY(VINYLPHOSPHONATE)S;

D O I：

10.1016/j.poly.2016.04.010

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The treatment of half-metallocene dialkyl yttrium complexes (C5Me4SiMe3)Y(CH2SiMe3)(2)(THF) (1a) and (C5Me4SiMe2Ph)Y(CH2SiMe3)(THF) (1b) with carbodiimide (RN=C=NR, R = Bu-t, Cy, Pr-i) resulted in two different kind of yttrium complexes bearing bis(amidinate) ligands. The reaction of complex la gave THF-free monoalkyl complexes (C5Me4Me3Si)Y(CH2SiMe3)[(RN)(2)C(CH2SiMe3)] (2a-c) as thermally robust crystals, while the reaction of complex 1b resulted in an ortho-metalated product 3, which contains a strained five-membered chelate ring formed by the C-H bond activation of the phenyl group. All resulted complexes were fully characterized by NMR spectroscopy and the structures of complexes 2a and 3 were confirmed by X-ray diffraction. Complexes 2a-2c show low to high activities for n-butyl acrylate polymerization to produce high molecular weight polymers. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：50 / 54

页数：5

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