Reaction of [Pt3(μ-CO)3(PtBu3)3] with activated olefins and alkynes: the X-ray-structure of [Pt(CO)(PtBu3)(CF3CCCF3)]
摘要:
The reactions of the triangulo-cluster [Pt-3(mu-CO)(3)(P'Bu-3)(3)] with activated olefins and alkynes have been examined under various conditions. At low temperature, cluster fragmentation occurs yielding the Pt(0) complexes [Pt(CO)((PBu3)-Bu-t)(olefin)] (olefin = maleic anhydride and maleimide), while di(tert-butyl)acetylenedicarboxilate reacts quantitatively giving the dinuclear Pt(0) complex [Pt-2(CO)(2)((PBu3)-Bu-t)(2)(mu-eta(2):eta(2)-(t)BuO(2)CCdropCCO(2)(t)Bu)]. At higher temperature and in the presence of alkyne in large excess, the latter dimer converts quantitatively to the monomers [Pt(CO)((PBu3)-Bu-t)(alkyne)] (alkyne = CF(3)CdropCCF(3) and (t)BuO(2)CCdropCCO(2)(t)Bu). The stereochemistry of these complexes has been established by NMR and IR measurements. The structure of [Pt(CO) ((PBu3)-Bu-t)(CF3CCCF3)] was confirmed by X-ray diffraction analysis. (C) 2004 Elsevier B.V. All rights reserved.