The title compound, trans-[Pd₂Cl₄(PCy₃)₂]·C₆H₆, where PCy₃ is tri­cyclo­hexyl­phosphine (C₁₈H₃₃P), cocrystallizes with one benzene mol­ecule in the centrosymmetric space group P2₁/c and both mol­ecules lie on inversion centers. Each Pd atom adopts a distorted square-planar geometry [angles vary from 84.23 (3) to 95.82 (3)°], and is bonded to a terminal chloride, a phosphine and two bridging chlorides. Bond lengths are typical of related species.

The Pd atom in the title complex, [PdCl₂(C₇H₉N)₂] or trans-[PdCl₂(NH₂CH₂Ph)₂], lies on a twofold axis. It has a distorted square-planar coordination environment formed by two benzyl­amine and two Cl^- ligands. The symmetry-unique cis angles at the Pd atom are 86.25 (11) and 93.75 (11)°.

In the title compound, trans-[PdCl₂(C₇H₉N)₂], the Pd atom lies on a crystallographic inversion centre and adopts a perfect square-planar coordination, with two chloride ligands at 2.2957 (6) Å and two N atoms of the 3,4-lutidine mol­ecules at 2.0252 (17) Å from the Pd atom.

The title complex, trans-[PdCl₂(PPh₃)]₂, in the crystal structure of its benzene disolvate, [Pd₂Cl₄(C₁₈H₁₅P)₂]·2C₆H₆,occupies a special position in the inversion centre. The Pd atom has a distorted square-planar coordination environment formed by a tri­phenyl­phosphine [Pd—P 2.2278 (6) Å], a terminal chloride [Pd–Cl 2.2722 (7) Å], and two bridging chloride ligands. The Pd—μ-Cl bond in the trans-position to the phosphine ligand [2.4128 (6) Å] is considerably longer than the Pd—μ-Cl bond in the trans-position to the terminal chloride [2.3228 (6) Å].