Cp with Pendant Phosphane – Chelates, Hemilability, and Catalysis
Cyclopentadienyl complexes with pendant phosphane ligands combine two of the most common ligand classes of organometallic chemistry in one ligand system. The basic idea of this chemistry is the possibility of a temporary decomplexation of the phosphane ligand thereby creating a vacant coordination site at the metal. While other groups investigated such systems with rhodium, iron or iridium as the metal, we focused on cobalt and, more recently, on nickel. Complexes 1-5 are relevant examples, which will be discussed in the lecture. Cobalt complexes such as 1-3 can be obtained with unusual and rare ligand systems and are often not available with an independent phosphane ligand instead of the tether. While we used a di-tert-butylphosphanylethyl tether some time ago, we more recently became interested in less stable nickel complexes with a secondary phosphane tether, of which 5 is one of the first example for a late transition metal.Read more
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