Pd(PBut2H)3, obtained by reacting Pd-(eta5-C5H5)(eta3-C3H5) With PBut2H, oxidatively adds the C-Cl bond of methylene chloride and of chloroform, giving the thermally stable derivatives trans-[PdCl(CH2Cl)(PBut2H)2], (2) and trans-[PdCl(CHCl2)(PBut2H)2], (3), respectively. Complex 1 solutions deposit, by gentle warming, the known dimer [Pd(mu-PBut2)(PBut2H)]2.