Abstract
The first trialkylpalladium(IV) complexes, stabilised exclusively through oxygen donor ligands, are reported. The dimethyl palladium complexes [PdMe 2(tmeda)] and [PdMe 2(bpy)] (tmeda = N,N,N′,N′-tetramethylethanediamine, bpy = bipyridyl) react with alkyl halides RX (= methyliodide, benzyl bromide, and allyl bromide) in the presence of the sodium and the silver salts of the tris-chelating oxygen ligands L − (=[CpCo{PR 2(O)} 3] − to give the palladium(IV) complexes LPdMe 2R. Crystals of [CpCo{PR 2 (O)} 3PdMe 3] are triclinic, space group P1 (Nr. 2) with A = 9.065(6) Å, B = 14.680(2) Å, C = 15.161(7) Å, α = 112.56(2)°, β = 104.92(4) °, γ = 95.04(3)°, Z = 3, and R = 0.051 for 3590 observed reflections with I > 3 σ( I). The palladium-oxygen and the palladium-carbon distances are 2.18 and 2.00 Å, respectively.
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