Patent ID: 7872150

Claim:
A process for preparing oxaliplatin of the structural formula I: comprising the following steps: a) reacting a (SP-4-2)dihalogen-[(1R,2R)-1,2-cyclohexanediamine-kN,kN′]platinum(II) complex with a silver salt in an aqueous medium in the presence of a solid inert material to obtain an acidic aqueous solution containing [(1R,2R)-1,2-cyclohexanediamine-kN,kN′]platinum(II) diaquacomplex and a solid phase, b) removing the solid phase, c) purifying the acidic aqueous solution containing [(1R,2R)-1,2-cyclohexanediamine-kN,kN′]platinum(II) diaquacomplex obtained in step b) with a solid polymeric material containing cationic exchange groups to obtain a purified acidic aqueous solution and d) adding at least one of an oxalic acid and an oxalic salt to the purified acidic aqueous solution obtained in step c) to obtain purified oxaliplatin.