Reactivity of o-diphenylphosphinobenzaldehyde toward [Pt(C2H4)(PPh3)2]. X-ray structure of [Pt(OCC6H4PPh2-o)H(PPh3)]·C6H6

Abstract

The compound o-diphenylphosphinobenzaldehyde reacts with [Pt(C₂H₄)(PPh₃)₂] under mild conditions to give the acyl hydride [Pt(OCC₆H₄PPh₂-o)H(PPh₃)]. In the presence of butanol a complete decarbonylation of the aldehyde occurs with formation of [Pt(PPh₃)₃]. The X-ray crystal structure of the acyl complex has been determined. The crystals are orthorhombic, space group Pn2₁a, with a= 17.673(9), b= 16.586(8), and c= 12.160(6)Å. The structure has been solved by three-dimensional Patterson and Fourier syntheses and refined by least squares to final R and R′ of 0.049 and 0.046 respectively. The metal atom is surrounded in a distorted square-planar geometry by the acyl ligand, a triphenylphosphine and a hydride ligand.