Bis(triphenylphosphine)platinum chloride is a metal phosphine complex with the formula PtCl2[P(C6H5)3]2.

The cis isomer is used primarily as a reagent for the synthesis of other platinum compounds.

The cis isomer is the prepared by heating solutions of platinum(II) chlorides with triphenylphosphine.

For example, starting from potassium tetrachloroplatinate: The trans isomer is the prepared by treating potassium trichloro(ethylene)platinate(II) (Zeise's salt) with triphenylphosphine:[3] With heating or in the presence of excess PPh3, the trans isomer converts to the cis complex.

The latter complex is the thermodynamic product due to triphenylphosphine being a strong trans effect ligand.