Diphosphines have taken on a dominant role as supporting ligands in transition-metal chemistry. Here, we describe complexes of the type [Cp*Fe(diphosphine)(X)] (X = Cl, H) where for diphosphine = 1,2-(di-allylphosphino)ethane (tape), a Lewis-acidic secondary coordination sphere (SCS) was installed via allyl group hydroboration using dicyclohexylborane (HBCy). The resulting chloride complex, [Cp*Fe(PB)(Cl)] (PB = 1,2-(di(3-cyclohexylboranyl)propylphosphino)ethane), was treated with -butyllithium (1-10 equiv), resulting incyclometalation at iron.
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February 2022
Bis(1-bora-4-phosphorinane) metal complexes have been synthesized using a Cp*M-protecting (M = FeCl, Co, Cp* = CMe) strategy and structurally authenticated by NMR spectroscopy and single crystal X-ray diffraction. Synthesis of these scaffolds is highly sensitive to the identity of vinylphosphine precursor. This approach provides a new method for the generation of saturated ,-containing main-group ring systems.
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