Résumé : Three diorganotin(IV) derivatives of 2,6-dihydroxymethylpyridine and 3-(N-pyrrolidino)-1,2-propanediol have been synthesized and characterized by Mössbauer spectroscopy, mass spectrometry and by 1H, 13C and 119Sn nmr. Their activities in vitro against two human tumor cell lines, MCF-7 and WiDr, are compared to those of cis-platin and doxorubicin. © 1992.