Reactions of SnCl 2 with the complexes cis-[PtCl 2 (P 2 )] (P 2 ¼ dppf (1,1'-bis(diphenylphosphino)ferrocene), dppp (1,3-bis(diphenylphosphino)resulted in the insertion of SnCl 2 into the PtÀCl bond to afford the cis-[PtCl(SnCl 3 )(P 2 )] complexes. However, the reaction of the complexes cis-[PtCl 2 (P 2 , dppp, dppb, and dpppe; P ¼ Ph 3 P and (MeO) 3 P) with SnX 2 (X ¼ Br or I) resulted in the halogen exchange to yield the complexes [PtX 2 (P 2 )]. In contrast, treatment of cis-[PtBr 2 (dppm)] with SnBr 2 resulted in the insertion of SnBr 2 into the PtÀBr bond to form cis-[Pt(SnBr 3 ) 2 (dppm)], and this product was in equilibrium with the starting complex cis-[PtBr 2 (dppm)]. Moreover, the reaction of cis-[PtCl 2 (dppb)] with a mixture SnCl 2 /SnI 2 in a 2 : 1 mol ratio resulted in the formation of cis-[PtI 2 (dppb)] as a consequence of the selective halogen-exchange reaction. 31P-NMR Data for all complexes are reported, and a correlation between the chemical shifts and the coupling constants was established for mono-and bis(trichlorostannyl)platinum complexes. The effect of the alkane chain length of the ligand and Sn II halide is described.