Synthesis and Characterization of Ag(I) and Pd(II) Complexes of Some Phosphorus Ylides

Abstract

Reaction of three previously reported phosphorus ylides Ph₃PCHCOC₆H₄CH₃ (Y1), Ph₃PCHCOC₆H₄NO₂ (Y₂) and Ph₃PCHCOC₆H₄Cl (Y₃) with AgNO₃ in 1:2 molar ratios using dichloromethane as solvent yielded mononuclear complexes of the type [(Y)₂.Ag]NO₃ (Y = Y₁ (1), Y₂ (2) and Y₃ (3)). The reaction of PdCl₂ with (Y₂) in equimolar ratio in acetonitrile at the reflux temperature gave the complex [PdCl(μ-Cl) Ph₃PCHCOC₆H₄NO₂]₂ (4) along with the phosphonium salt [Ph₃PCH₂COC₆H₄NO₂]Br. The same reaction in a 1:2 molar ratio with (Y₁) at the reflux temperature gave a binuclear complex of the type [Pd{CH{P(C₆H₄)(Ph₃)₂} COC₆H₄CH₃}(μ-Cl)]₂ (5) along with the phosphonium salt [Ph₃PCH₂COC₆H₄CH₃]Br. This complex reacts with PPh₃ in a 1:2 molar ratio in dichloromethane to give the product of bridgesplitting [Pd{CH{P(C₆H₄)(Ph₃)₂}COC₆H₄CH₃}Cl (PPh₃)] (6). The characterization of these compounds was carried out by IR, ¹H, ³¹P and ¹³C NMR spectroscopy and elemental analysis.