Synthesis of palladium(II) and platinum(II) complexes with crown ether phosphane ligands: Stille coupling of aryl iodides in water

Article abstract of DOI:10.1002/ejic.200400906

The crown ether phosphanes PAr*Ph₂ (1) and PAr*₂R [Ar* = 3,4-(18-crown-6)-phenyl; R = Me (2); R = Ph (3)], prepared from PCl₂R and Ar*Li, have been studied. The syntheses and characterization of their oxides (4-6), and their BH₃ (7-9), PdCl₂ (10-12), and PtCl₂ (13-15) complexes are reported. The molecular structure of the borane complex PAr* ₂Ph·BH₃ (9) has been determined by X-ray structural analysis. Spectroscopic data suggest that phosphanes 1-3 have similar electronic properties and steric requirements to the corresponding phenylphosphane ligands PPh₂Me and PPh₃. Crown ether methylphosphane 2 and its complexes are remarkably water soluble, but 1 and 3 are only slightly soluble. Palladium(II) complexes 14 and 15 have been tested as catalysts in the Stille coupling of phenyltrichlorostannanes and aryl iodides in water.