THE HALOGEN EFFECT IN OXIDATIVE ADDITION OF TRIMETHYLSILYL AND TRIMETHYLTIN HALIDES TO PLATINUM(II) - SYNTHESIS AND CHARACTERIZATION OF SILYLPLATINUM(IV) COMPLEXES

The reactions of group IV halo trimethyl compounds with electron-rich Pt(II) complexes give facile oxidative addition of the M-X bond (M = S i, X = Br, I; M = Sn, X = Cl, Br, I). Equilibrium studies when M = Sn show that there is a pronounced thermodynamic favorability of the reac tions with heavier halides, and it is this effect which makes isolatio n of silylplatinum(IV) complexes possible. The crystal structure of [P tIMe2(SiMe3)(2,2'-bipyridyl)] has been determined and shows an excepti onally long Pt-I bond arising from the strong trans influence of the t rimethylsilyl group.