Synthesis and structure of Pd and Pt complexes with doubly stabilized phosphorus ylides

Abstract

The doubly stabilized P-ylide ligands Ph3P=C(CO2Me)C(=S)N(H)Ph (L1), Ph3P=C(CN)C(=S)N(H)Ph (L2), and Ph3P=C(CN)-[(E)-C(CO2Me)=CH(CO2Me)] (L3) have been prepared and fully characterized. The X-ray structures of L1 and L2 are reported. The reactivity of L1, L2, and L3 towards cationic PdII and PtII precursors with two vacant coordination sites has been studied. Adducts of general formula [M(CX)(Ln)]ClO4, [M(CX)(Ln)2]ClO4, and [M(-Ln)(CX)]2(ClO4)2 (CX = ancillary ligands) were obtained. The ylides Ln coordinate to the metal center through their heteroatoms (O, N, S), while the C bonding of Ln has not been observed in any of the cases studied.