Reactions of tr~ ns-[PtCl~(SMe~)~] with 1 or 2 equiv of AuC= Ct-Bu give unstable complexes formulated as [P~ C~(C= C-~-BU)(SM~~)~(AUC~)] and [P~(C= C-~-BU)~(SM~~)~(AUC~)~] with the AuCl units probably bonded to the alkynylplatinum groups. Further reaction of these complexes with dppm, Ph2PCH2PPh2, gave the binuclear trans-[PtC1 (C= Ct-Bu)(p-dppm) zAu]+ C1-and trans-[Pt (C= CtB~)~(p-dppm)~ Au]+ Cl-and the trinuclear trans-[Pt (C= CtB~ ...