Reactivity of alkynyl platinum complexes towards PPh2H and PPh2(O)H: Unexpected formation of alkynyl tetralithium diplatinum compounds stabilized by μ3-(κ3P,O,O-PPh2O-) ligands

The reactivity of “Li2[Pt(C≡CR)4]” and cis-[Pt(C≡CR)2COD] (R = tBu, Ph) towards PPh2H and PPh2(O)H has been investigated; it results in the synthesis of five types of alkynyl platinum compounds, for example, [{Pt(C≡CtBu) (PPh2O)3Li2(thf) (H2O)}2] (1). Displacement of PPh2(O)H by donor ligands in the compound [{Pt(C≡CR){(PPh2O)2H}(PPh2OH)] yields the related mononuclear complexes [Pt(C≡CR){(PPh2O)2H}L]n−We thank the Direccion General de Investigacion Cientifica y Tecnica (Spain; ProjectsPB95-0003-C02-01-02 and PB95-0792) and the University of La Rioja (Project API-98/B16 and a grant forJ.G.) for financial support.Peer reviewe