The synthesis and reactivity of a cobalt-hydride will be discussed.  Metal-hydrides are important reactive species in both industrial and biological chemical transformations.  A cobalt-hydride having three phosphine ligands and a labile dinitrogen ligand can be synthesized from a reduced Zr/Co heterobimetallic complex supported by a trisphosphinoamide ligand framework.  The reactive starting material THF-Zr(MesNPiPr2)3Co-N2 reacts with one equivalent of pyridine-n-oxide to yield (iPr2PNMes)Zr(�-O)(MesNPiPr2)2Co-Py.  An equivalent of Ph3SiH can be added to afford Ph3SiOZr(MesNPiPr2)3Co(H)N2, in which the Si-H bond is cleaved across the Co-O bond.  The cobalt-hydride reacts with a variety of unsaturated bonds, one in particular is the insertion of adamantyl azide to produce a terminal triazenido species, Ph3SiOZr(MesNPiPr2)3CoN(H)NNAd.  Addition of tert-butyl isocyanide to the triazenido product results in reduction from Co(I) to Co(0).  The mechanism of this transformation and other relevant reactivity will be discussed.

Synthesis and reactivity of an electron rich co-hydride using an early/late heterobimetallic system

245th National Meeting (2013)

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