Stereospecific ligands and their complexes. Part XV. Synthesis, characterization and cytotoxicity of novel platinum(IV) complexes with some esters of ethylenediamine-N,,N’N′-di-S,,S-(2,2′’-dibenzyl)acetic acid. Crystal structure of O,,O′’-dipropyl-ethylen

The synthesis of ethylenediamine-N,,N′’-di-S,,S-(2,2′’-dibenzyl)acetic acid (H2-S,,S-eddba) and its ethyl-, propyl-, butyl- esters (R2-S,,S-eddba) are reported here. The esters were used for synthesis of the corresponding platinum(IV) complexes, [PtCl4(R2-S,,S-eddba)]. The compounds were characterized by elemental analysis, infrared, 1H and 13C NMR spectroscopy. The structure of propyl ester of H2-S,,S-eddba was confirmed by single-crystal X-ray analysis. All [PtCl4(R2-S,,S-eddba)] complexes displayed significantly higher in vitro cytotoxicity in comparison to cisplatin.