Stereospecific Intramolecular S→Pt Transmethylation from 8-(Methylthio)quinoline to Coordinated PtMe₂: Formation of <i>s</i><i>yn</i>-[<i>f</i><i>ac</i>-Pt^IVMe₃(μ-8-quinolinethiolato)]₂ with Stacked Quinoline Rings

Sulfur to platinum(II) transmethylation was observed on reacting [PtMe2(μ-SMe2)]2 or [PtMe2(μ-SEt2)]2 with 8-(methylthio)quinoline (mtq) for extended periods of time or on heating of the isolable intermediate PtMe2(mtq). The final product, syn-[fac-PtMe3(μ-qt)]2 (qt- = 8-quinolinethiolato), exhibits two quinoline rings in a nearly stacked arrangement. This internal redox reaction involving organometallic platinum constitutes a variant of the well-known platinum complex induced S-demethylation and proceeds in a stereospecific manner, as indicated by CD3 labeling experiments.