Ligand effects in novel ruthenium-based ROMP catalysts bearing bidentate phosphines

被引：41

作者：

Six, C ^{[1
]}

Beck, K ^{[1
]}

Wegner, A ^{[1
]}

Leitner, W ^{[1
]}

机构：

[1] Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany

来源：

ORGANOMETALLICS | 2000年 / 19卷 / 22期

关键词：

D O I：

10.1021/om000200j

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Complexes of general formula [(Cy2P(CH2)(n)-PCy2)Ru(eta (3)-C4H7)(2)] (n = 1-3) are halide-free initiators for ring-opening metathesis polymerization (ROMP) of norbornene. The chain length of the chelating phosphine exhibits an effect on the polymer yield and the stereochemistry at the C=C double bond. Analysis of the resulting polymer by GPC and electron microscopy indicates an initiation efficiency of approximately 10%. A mechanism for the formation of the propagating species is proposed that involves merging of the two allyl moieties and cycloreversion of the resulting ruthenacyclobutane to give a carbene intermediate containing a cis-PRuP chelate ring.

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收藏

页码：4639 / 4642

页数：4

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