Structural Characterization of β-Agostic Bonds in Pd-Catalyzed Polymerization

Structural Characterization of β-Agostic Bonds in Pd-Catalyzed Polymerization
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Pd 催化聚合中 β-Agostic 键的结构表征

DOI:
10.1021/acs.organomet.7b00666
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发表时间:
2017
期刊:
影响因子:
2.8
通讯作者:
Diao, Tianning
Diao, Tianning
中科院分区:
化学2区
文献类型:
--
作者:
Xu, Hongwei;Hu, Chunhua Tony;Wang, Xiaoping;Diao, Tianning

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β-无机钯络合物是催化反应的关键中间体,如烯烃聚合和Heck反应。然而,由于这些高度不稳定的分子很难分离的事实,Pdβ-agostic络合物一直难以进行结构表征。在这里,我们报道了β-Agostic(α-diimine)Pd-乙基中间体聚合反应的单晶X射线和中子衍射表征。较短的Cα-Cβ距离和尖锐的Pd-Cα-Cβ键角相结合,是β-无机盐相互作用的明确证据。对无机键结构和消除β-H的动力学势垒的表征为深入理解无机键和聚合机理提供了重要的见解。
β-agostic Pd complexes are critical intermediates in catalytic reactions, such as olefin polymerization and Heck reactions. Pd β-agostic complexes, however, have eluded structural characterization, due to the fact that these highly unstable molecules are difficult to isolate. Herein, we report the single-crystal X-ray and neutron diffraction characterization of β-agostic (α-diimine)Pd–ethyl intermediates in polymerization. Short Cα–Cβdistances and acute Pd–Cα–Cβbond angles combined serve as unambiguous evidence for the β-agostic interaction. Characterization of the agostic structure and the kinetic barrier for β-H elimination offer important insight into the fundamental understanding of agostic bonds and the mechanism of polymerization.
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。
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发表时间: 2009
影响因子: 4.9
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