Chromium mediated reductive coupling of isonitrile forms unusual heterocycles.

@article{Shen2014ChromiumMR,
  title={Chromium mediated reductive coupling of isonitrile forms unusual heterocycles.},
  author={Jingmei Shen and G. Yap and K. Theopold},
  journal={Journal of the American Chemical Society},
  year={2014},
  volume={136 9},
  pages={
          3382-4
        }
}
The quintuply bonded α-diimine chromium dimer [(H)L(iPr)Cr]2 reductively couples cyclohexyl isocyanide to produce various novel nitrogen heterocycles. Tetramerization yielded, inter alia, the aromatic squaramidinate, i.e. [C4(NCy)4](2-), whereas hexamerization produces a substituted 1,4-diaza-bicyclo[3.3.0]octadiene dianion. These unprecedented transformations complement the coupling reactions of isoelectronic CO, and they may prove synthetically useful. 
Formation of a dimeric tungsten(i) complex via C-H activation.
CO2 and SO2 activation by a Cr-Cr quintuple bond.
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