Adducts of Lewis acidic stibanes with phosphane chalcogenides

Abstract

Starting from ClSbR^F₂ (R^F = C₂F₅, 3,5-(CF₃)₂C₆H₃) and H(E)P(tBu)₂ (E = O, S), we prepared the oxy- and sulphanediyl-bridged adducts R^F₂Sb(Cl)–E–(H)P(tBu)₂, which are stable against the elimination of HCl. The different electron-withdrawing substituents and chalcogen bridging units influence the size of the Sb–E–P angle. ClSb(C₂F₅)₂ and nBu₃SnH react to give HSb(C₂F₅)₂, which seems to interact weakly with H(O)P(tBu)₂ in solution as observed via NMR. All products were characterised by NMR spectroscopy and all the stable ones were additionally characterised by X-ray diffraction and elemental analyses.