Patent ID: 7605282

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 to obtain an aqueous medium to obtain an aqueous solution containing ionic platinum(II)diaqua-complex and a solid phase, b) removing the solid phase, c) adjusting the pH-value of the aqueous solution containing the ionic platinum(II)diaqua-complex obtained in step b) to a pH-value of 9.5, to obtain an alkaline solution comprising a (SP-4-2)dihydroxo-[(1R,2R)-1,2-cyclohexanediamine-kN,kN′]platinum(II) complex (DACHPt(OH) 2 ), d) purifying the alkaline solution to obtain a purified alkaline solution and e) adding oxalic acid and/or an oxalic salt to the purified alkaline solution obtained in step d) to obtain purified oxaliplatin.