1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate) and the hydrates thereof

1. Dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate).

2. Method for producing the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methyl-benzenesulfonate), comprising the following steps:

a) reacting 1,2-cyclohexanediamindihalogenplatinum(II) and silver 4-methylbenzenesulfonate in a water-containing solvent to form 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate) and silver halogenide;

b) separating the silver halogenide from the reaction mixture from step a);

c) adding a compound that forms an azeotropic mixture with water;

d) removing at least part of the water from the azeotropic mixture;

e) adjusting the water fraction to form the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate);

f) isolating the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate).

3. Method according to claim 2 , wherein chlorine, bromine and/or iodine is used as halogen in 1,2-cyclohexanediamindihalogenplatinum(II).

4. Method according to claim 2 , wherein the reaction proceeds at sub-stoichiometric levels of silver 4-methylbenzenesulfonate.

5. Method according to claim 2 , wherein activated charcoal is added to the reaction mixture in step c) after separation of the silver halogenide in step b) and before the addition of the compound that forms an azeotropic mixture with water.

6. Method according to claim 2 , wherein the water-containing solvent in step a) is water or a mixture containing water and at least one further compound that forms an azeotropic mixture with water.

7. Method according to claim 2 , wherein the compound that forms an azeotropic mixture with water is n-butanol.

8. Method according to claim 2 , wherein the azeotropic mixture is fully removed in step d) while forming a solution of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate) in the compound that forms an azeotropic mixture with water.

9. Method of using the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate) as reference standard for (SP-4-2)-diaqua[(1R,2R)-cyclohexane-1,2-diamin-κN, κN′]platinum, comprising

i. providing an oxaliplatin solution;

ii. providing a solution of the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate) as reference standard;

iii. recording a chromatogram of the oxaliplatin solution from step i);

iv. recording a chromatogram of the reference standard solution from step ii); and

v. comparing the chromatograms from steps iii) and iv) in order to determine the fraction of (SP-4-2)-diaqua[(1R,2R)-cyclohexane-1,2-diamin-κN, κN′]platinum.

10. Method according to claim 9 , wherein an aqueous solution is used in step i) and/or step ii).

11. Method according claim 9 , wherein the chromatograms in steps iii) and iv) are chromatograms from high-pressure liquid chromatography (HPLC).

12. Method of using the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate) for producing polymer-bound cyclohexanediaminplatinum(II) complexes, comprising:

a. providing the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate);

b. providing a polymer that comprises at least one or more groups capable of forming a bond to platinum;

c. reacting the dihydrate of 1,2-cyclohexanediaminplatinum(II)-bis-(4-methylbenzenesulfonate) and the polymer in a solvent.

13. Method according to claim 12 , wherein the polymer comprises a group that is capable of forming a 4- to 7-membered chelate ring with platinum.

14. Method according to claim 12 , wherein the polymer comprises carboxylate groups, amide groups or amino groups.

15. Method according to claim 12 , wherein the solvent comprises water.