Synthesis and structures of a chiral phosphine–phosphoric acid ligand and its rhodium(I) complexes

Abstract

The synthesis and characterization of a novel chiral phosphine–phosphoric acid ligand, (R)-3-diphenylphosphino-1,1′-binaphthyl-2,2′-diyl hydrogenphosphate (2) and its rhodium(I) complexes are described. The single-crystal X-ray diffraction analysis of 2 showed the intermolecular hydrogen-bonding network of the phosphoric acid moiety. The reactions of 2 with [RhCl(cod)]2 in the presence of KOtBu or with [Rh(acac)(CO)2] (acac=acetylacetonate) gave P,O-chelating rhodium(I) complexes [Rh(2–H+)(cod)] 3 or [Rh(2–H+)(CO)]24, respectively. Their molecular structures were determined by single-crystal X-ray diffraction.