1. Synthesis, structure and reactivity of NHC–nickel complexes containing carbonato ligands.
- Author
-
Guo, Jin, Lv, Lanlan, Wang, Xiaojun, Cao, Changsheng, Pang, Guangsheng, and Shi, Yanhui
- Subjects
- *
AMMONIUM compounds , *METAL-organic frameworks , *COORDINATION compounds , *CHEMICAL synthesis , *METAL complexes , *BRIDGING ligands , *MOLECULAR structure - Abstract
Abstract: Reactions of different alkane-bridged (n =1–3) di-NHC precursors, bisimidazolium chlorides with the NiCl2 in presents of K2CO3 in acetonitrile give the corresponding 16-electron binuclear complexes of the type Ni(di-NHC)(μ-O)2CO in moderate yield. The molecular structures of 1–3 have been determined by X-ray crystallography, which revealed a cis-chelating di-NHC on a slightly distorted square-planar nickel center with κ2-cabonato ligand. The influence of the different di-NHC ligands on the structure and reactivity of the complexes has been studied. The catalytic properties of the complexes were investigated in the Kumada reaction for cross-coupling of phenylmagnesium bromide with a variety of aryl halides. The complex 3 which has the longest linker between two NHCs shows the best catalytic activity in these reactions. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF