Synthesis and Reactivity of a Transition Metal Complex Containing Exclusively TEMPO Ligands: Ni(η2-TEMPO)2

Synthesis and Reactivity of a Transition Metal Complex Containing Exclusively TEMPO Ligands: Ni(η2-TEMPO)2
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DOI:
10.1021/ic2007342
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发表时间:
2011-07-04
影响因子:
4.6
通讯作者:
Captain, Burjor
Captain, Burjor
中科院分区:
化学2区
文献类型:
--
作者:
Isrow, Derek;Captain, Burjor

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Ni(COD)(2)与2当量的克里思自由基在68 ℃下反应,得到16 e(-)“蝴蝶结”配合物Ni(eta(2)-克里思)(2),1,产率为78%。化合物1与叔丁基异氰化物和苯乙炔在室温下反应,分别得到16个e(-)畸变正方形平面镍配合物Ni(eta(2)-克里思)(eta(1)-克里思)((CNBu)-Bu-t),2和Ni(eta(2)-TEMPO)(eta(1)-TEMPO)(CCPh),4。克里思配体从eta(2)结合模式转变为eta(1)结合模式有助于1的易反应性。配合物4是一个不寻常的例子,氢原子转移从苯乙炔到一个协调的克里思配体。
The reaction of Ni(COD)(2) with two equivalents of the TEMPO radical at 68 degrees C affords the 16 e(-) "bowtie" complex Ni(eta(2)-TEMPO)(2), 1, in 78% yield. Compound 1 reacts with tert-butyl isocyanide and phenylacetylene at room temperature to yield the 16 e(-) distorted square planar nickel complexes Ni(eta(2)-TEMPO)(eta(1)-TEMPO)((CNBu)-Bu-t), 2, and Ni(eta(2)-TEMPO)(eta(1)-TEMPOH)(CCPh), 4, respectively. The facile reactivity of 1 is aided by the transition of the TEMPO ligand from an eta(2) to eta(1) binding mode. Complex 4 is an unusual example of hydrogen atom transfer from phenylacetylene to a coordinated TEMPO ligand.