Platinum(II) Complexes Incorporating Racemic and Optically Active 1-Aryl-3- phospholene P-Ligands as Potential Catalysts in Hydroformylation
Three 1-aryl-3-methyl-3-phospholene 1-oxides were prepared in optically active form by resolution with TADDOLderivatives,
that, together with the racemic forms, were converted to the corresponding phosphine-borane adducts and cisbis(
phospholeno)-dichloroplatinum complexes after deoxygenation by trichlorosilane. The stereostructures of the Pt-complexes were
evaluated by high level quantum chemical calculations. By adding SnCl2 cocatalyst, the complexes were tested as in situ catalysts in the
hydroformylation of styrene. The activity of the new Pt-complexes was, in most cases higher, than that of the analogues described earlier.
Keywords: 3-Phospholene oxide, catalyst precursor, deoxygenation, hydroformylation, optical resolution, P-ligand, phosphine-boranes,
platinum complexes, stereostructure, theoretical calculations.
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