Synthesis and Structures of (η3-Methallyl)palladium(II) Complexes with Phosphanylferrocenecarboxylic Ligands

Abstract

Di-μ-chlorobis{(η3-methallyl)palladium(II)} (1) reacts with two equivalents of 1'-(diphenylphosphanyl)ferrocene-1-carboxylic acid (Hdpf) and rac-[2-(diphenylphosphanyl)ferrocen-1-yl]acetic acid (rac-Hpfa) to give complexes with P-monodentate phosphanylcarboxylic ligands: [PdCl(η3-CH2C(Me)CH2)(L-κP)], L = Hdpf (2) and rac-Hpfa (4). Similar reactions with the corresponding carboxylate salts (Kdpf and Kpfa) afford, respectively, an ill-defined polymer formulated tentatively [{Pd(η3-CH2C(Me)CH2)(dpf)}n] (3) and the molecular chelate complex [Pd(η3-CH2C(Me)CH2)(pfa-κ2O,P)] (5), which crystallizes as a monohydrate. All compounds were studied by spectral methods (IR and NMR) and the solid-state structures of 2, 4, and 5·H2O were determined by single-crystal X-ray diffraction.