C–H Bond Activation of Simple Alkenes with (C
<sub>5</sub>
H
<sub>5</sub>
)CO Fragments: Preparation, Molecular Structure, and Dynamical Behaviour of Tri‐ and Tetranuclear Cyclopentadienylcobalt Cluster complexes with μ‐Cycloalkyne Ligands
作者:Hubert Wadepohl、Till Borchert、Hans Pritzkow
DOI:10.1002/cber.19971300510
日期:1997.5
trinuclear cluster complexes. The tetranuclear 8b, c had the cycloalkynes quadruply bridging (μ4-η1:η2:η2:η1_ a butterfly arrangement of the metal atoms. The acetylenic carbon–carbon bonds are considerably lengthened upon coordination [1.392(4), 1.398(3) å in 5c d; 1.464(8), 1.499(5) Å in 8b, c]. Three dynamic processes – alkyne “walk” on top of the CO3 triangle, μ2-hydride migration, and μ2/μ3-hydride
在温和条件下用(C 5 H 5)CO片段的反应性源进行处理后,会活化环烯烃C n H 2n(n = 5-8)的邻位C-H键。随着[C 5 H ^ 5)CO(C 2 H ^ 4)2 ](图2a),三核簇络合物[H 2((C 5 H ^ 5)CO)3(μ 3 -C 2(CH 2)n-2个)](5a:n = 5; 5c:n = 5d:n = 8)。使用更具反应性的[(C 5 H ^ 5)2 CO] / K,5A - 5d中得到,与少量的四核的沿着[(C 5 H ^ 5)CO} 4环R μ 4 -C 2(CH 2)n-2 }](8a–c:n = 5-7)。进行了5c,d和8b,c的X射线结构分析。甲μ-‖(orμ 3 -η 1:η 2:η 1在三核簇复合物中发现了环炔配体的配位。四核8B,C有环炔四重桥接(μ 4 -η 1:η 2:η 2:η 1。_的金属原子的蝶形结构的炔属碳-碳键可应协调[1