Übergangsmetall-substituierte Phosphane, Arsane und Stibane, XXVII [1] Wolfram-Komplexe mit Di(tert-butyl)arsino-, mono- oder dihapto-Di(tert-butyl)thioarsinyl-Liganden / Transition-Metal Substituted Phosphanes, Arsanes and Stibanes, XXVII [1] Tungsten Complexes with Di(tert-butyl)arsino, mono- or dihapto-Di(tert-butyl)thioarsinyl Ligands

Abstract

The reaction of Bu^t ₂AsCl with Na[W(CO)₃Cp] in THF yields the metal arsine Cp(CO)₃W−AsBu^t ₂ (1), which is oxidized with elemental sulfur to the arsine sulfide Cp(CO)₃W−AsBu^t ₂(S) (2). 2 is converted in refluxing pentane with loss of CO into Cp(CO)₂W(η²-AsBu^t ₂S) (3). The chiral complex contains the novel dihapto-Bu^t ₂As−S ligand and exhibits dynamic behaviour (⊿G≠286 = 15.4 kcal/mol). Side-on coordination of the Bu^t ₂As−S ligand is proved by spectroscopic data and X-ray analysis. 3 crystallizes in the monoclinic space group P2₁/n with a = 12.141(2), b = 15.179(2), c = 19.558(2) Å, β = 99.61(2)°. The structure was refined to R = 0.051 for 4087 independent reflections.