Synthesis of Palladium(II) and Platinum(II) Complexes with Crown Ether Phosphane Ligands: Stille Coupling of Aryl Iodides in Water

✍ Scribed by Jorge Fresneda; Ernesto de Jesús; Pilar Gómez-Sal; Carmen López Mardomingo

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 164 KB
• Volume: 2005
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200400906

✦ Synopsis

Abstract

The crown ether phosphanes PAr*Ph~2~ (1) and PAr*~2~R [Ar* = 3,4‐(18‐crown‐6)‐phenyl; R = Me (2); R = Ph (3)], prepared from PCl~2~R and Ar*Li, have been studied. The syntheses and characterization of their oxides (4–6), and their BH~3~ (7–9), PdCl~2~ (10–12), and PtCl~2~ (13–15) complexes are reported. The molecular structure of the borane complex PAr*~2~Ph·BH~3~ (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 PPh~2~Me and PPh~3~. 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. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)