Highly isospecific polymerization of methyl methacrylate with a bis(pyrrolylaldiminato)samarium hydrocarbyl complex

被引：73

作者：

Cui, CM ^{[1
]}

Shafir, A ^{[1
]}

Reeder, CL ^{[1
]}

Arnold, J ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

来源：

ORGANOMETALLICS | 2003年 / 22卷 / 17期

关键词：

D O I：

10.1021/om030454f

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

New types of samarium alkyl complexes, L-2-SmMe (THF) (2) and L2SmCH2SiMe3(THF) (3), supported by the pyrrolylaldiminato ligand L (L = [2-(2,6-iPr(2)C(6)H(3)N=CH)-5-tBuC(4)H(2)N](-)), were prepared from the corresponding chloride L2SmCl(THF) (1) with the appropriate alkyllithium reagents; the corresponding yttrium alkyl L2YCH2SiMe3 (4) was prepared similarly. The molecular structures of 1 and 3 were determined by X-ray single-crystal analyses. Compound 3 initializes the stereospecific polymerization of MMA to yield highly isotactic PMMA (mm triad 94.8%) with high molecular weight and narrow molecular distribution at room temperature while 2 is inactive. The possible initial step of the polymerization reaction was proposed.

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页码：3357 / 3359

页数：3

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