Journey from Mo-Mo quadruple bonds to quintuple bonds.

@article{Tsai2009JourneyFM,
  title={Journey from Mo-Mo quadruple bonds to quintuple bonds.},
  author={Yi‐Chou Tsai and Hong-Zhang Chen and Chung-Ching Chang and Jen-Shiang K. Yu and Gene-Hsiang Lee and Yu Wang and Ting‐Shen Kuo},
  journal={Journal of the American Chemical Society},
  year={2009},
  volume={131 35},
  pages={
          12534-5
        }
}
Heating K(4)Mo(2)Cl(8) and 2 equiv of Li[RC(NDipp)(2)] (R = H, Ph; Dipp = 2,6-i-Pr(2)C(6)H(3)) in tetrahydrofuran (THF) at 60 degrees C gives two paddlewheel type quadruply bonded dimolybdenum complexes, Mo(2)(mu-Cl)[Cl(2)Li(OEt(2))][mu-eta(2)-RC(N-2,6-i-Pr(2)C(6)H(3))(2)](2) (R = H (1), Ph (2)). The Mo-Mo bond lengths of 1 and 2 are 2.0875(4) and 2.0756(8) A, respectively, indicating typical Mo-Mo quadruple bonds. Reduction of 1 and 2 by two electrons results in the isolation of their… 
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