The platinum S2O complex [(Ph3P)(2)Pt(S2O)] (10) was obtained by S2O transfer reactions from tetrathiolane 2-oxide (8), tetrathiolane 2,3-dioxide (5), and pentathiane 3-oxide (6) to [(C2H4)Pt(PPh3)(2)] (4). The S20 complex 10 further reacts with 4 to give a novel binuclear platinum complex 16, which is found to be a source of several platinum SnOm complexes. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).