Rearrangements of Acetylacetonate Ligands in the Process of the Formation of Pd(Acac)2 Complexes with P(p-ClC6H4)3

The complexation of Pd(Acac)(2) with P(p-ClC(6)H(4))(3) in benzene and hexane is studied by IR and UV spectroscopy. The coordination of phosphine to Pd(Acac)(2) is accompanied by the sequential rearrangement of the acetylacetonate ligands at the Pd atom into the monodentate O-bonded, ionic, and, finally, C-bonded forms. With an excess of phosphine, a system of catalytic oxidation of P(p-ClC(6)H(4))(3) to P(O)(p-ClC(6)H(4))(3) is organized.