Gamma-agostic interactions stabilize the propagating species in the vinyl addition polymerization of norbornene.
Gamma-agostic interactions stabilize the propagating species in the vinyl addition polymerization of norbornene.
复制标题
γ-不规则相互作用稳定了降冰片烯乙烯基加成聚合中的增长物质。
DOI：
10.1039/b916457j
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发表时间：
2009
影响因子：
4.9
通讯作者：
M. Brookhart
中科院分区：
文献类型：
--
作者：
Marc D. Walter;P. White;M. Brookhart
通过（tmeda）PdMe(2)的质子化反应合成了阳离子[(tmeda)Pd(OEt(2))(Me)][B(Ar(F))(4)]，首次对降冰片烯乙烯加成聚合中繁殖物种的性质进行了识别。在这个系统中，伽马相互作用稳定了传播的物种，并允许通过(1)氢核磁共振波谱观察到逐步的单体插入。这项研究和早期的研究为无配体晚期过渡金属催化降冰片烯聚合的繁殖物种提供了新的建议。
Cationic [(tmeda)Pd(OEt(2))(Me)][B(Ar(F))(4)] was synthesized by protonation of (tmeda)PdMe(2) and allowed for the first time the nature of the propagating species in the vinyl addition polymerization of norbornene to be discerned. In this system gamma-agostic interactions stabilize the propagating species and permit stepwise monomer insertions to be observed by (1)H NMR spectroscopy. This and earlier studies provide a new proposal for the propagating species in ligand-less late transition metal-catalyzed norbornene polymerizations.