The reactions of [Ag(NH=CMe2)(2)]ClO4 with cis-[PtCl2L2] in a 1:1 molar ratio give cis- [PtCl(NH=CMe2)(PPh3)(2)] ClO4 (1cis) or cis-[PtCl(NHdCMe(2))(2)(dmso)]ClO4 (2), and in 2:1 molar ratio, they produce [Pt(NH=CMe2)(2)L-2](ClO4)(2) [L = PPh3 (3), L-2 = tbbpy = 4,4'-di-tert-butyl-2,2'-dipyridyl (4)]. Complex 2 reacts with PPh3 (1:2) to give trans-[PtCl(NH=CMe2)(PPh3)(2)]ClO4 (1trans). The two-step reaction of cis-[PtCl2(dmso)(2)], [Au(NH=CMe2)(PPh3)]ClO4, and PPh3 (1:1:1) gives [SP-4-3]-[PtCl(NH=CMe2)(dmso)(PPh3)]ClO4 (5). The reactions of complexes 2 and 4 with PhICl2 give the Pt(IV) derivatives [OC-6-13]-[PtCl3(NHdCMe(2))(2)(dmso)]ClO4 (6) and [OC-6-13]-[PtCl2(NH=CMe2)(2-)(dtbbpy)](ClO4)(2) (7), respectively. Complexes 1cis and 1trans react with NaH and [AuCl(PPh3)] (1:10:12) to give cis- and trans-[PtCl {mu-N(AuPPh3)=CMe2}(PPh3)(2)]ClO4 (8cis and 8trans), respectively. The crystal structures of 4 center dot 0.5Et(2)O center dot 0.5Me(2)CO and 6 have been determined; both exhibit pseudosymmetry.