A series of cis-silyl(stannyl)platinum(II) complexes have been prepared by oxidative addition of silylstannanes to Pt(cod)2 in toluene in the presence of tertiaryphosphine ligands: cis-Pt(SiR3)(SnMe3)L2 [L = PMe2Ph, SiR3 = SiMe3 (1a), SiMe2Ph (1b), SiMePh2 (1c), SiPh3 (1d); SiR3 = SiMe2Ph, L = PMe3 (1e), PEt3 (1f), PMePh2 (1g)]. These complexes undergo competitive insertion of alkynes (R‘C⋮CH) into