Instead of reacting with the σ-mesityliron(II) complex [Cp′′′Fe(σ-C 6 H 2 Me 3 -2,4,6)] (1; Cp′′′ = 1,2,4-tri-tert-butylcyclopentadienyl) to form a cyclohexadienyl(cyclopentadienyl)iron(II) sandwich complex with palladium coordination to the ipso carbon atom of the six-membered ring, palladium(II) chloride oxidized 1 to the mesityliron(III) complex [Cp′′′Fe(σ-C 6 H 2 Me 3 -2,4,6)Cl] (5) with a two-legged piano-stool geometry. The oxidation of [ 4 CpFe(σ-C 6 H 2 Me 3 -2,4,6)] (4; 4 Cp = tetraisopropylcyclopentadienyl) to [ 4 CpFe(σ-C 6 H 2 Me 3 -2,4,6)Cl] (6) was accom-