Unexpected C(carbene)-X (X: I, Br, Cl) Reductive Elimination From N-Heterocyclic Carbene Copper Halide Complexes Under Oxidative Conditions.
Unexpected C(carbene)-X (X: I, Br, Cl) Reductive Elimination From N-Heterocyclic Carbene Copper Halide Complexes Under Oxidative Conditions.
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DOI:
10.1021/om1005726
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发表时间:
2010-09-13
期刊:
影响因子:
2.8
通讯作者:
Stack TD
中科院分区:
文献类型:
--
作者:
Lin BL;Kang P;Stack TD
The non-innocent behaviors of NHC ligands have attracted wide attention due to their important implications for catalyst designs and reaction mechanisms. Herein, we report facile Ccarbene–halogen reductive eliminations from NHC copper halide complexes at RT under oxidative conditions. Density functional calculations on a simplified model system suggest that the reactions occur through oxidation of Cu(I) to Cu(III) species followed by Ccarbene–halogen reductive eliminations from NHC Cu(III) halide complexes. Remarkably short Ccarbene–chloride contacts and rare interactions between the chloride lone pair electrons and the Ccarbene pπ orbital were found for the calculated NHC Cu(III) chlorides. The facile Ccarbene–X reductive elimination reported here warrants consideration as a potential decomposition pathway in reactions involving NHC-supported high-valent metal complexes, especially with late transition metals.
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