Telluroureas and derived transition metal complexes: the crystal and molecular structure of [Cr(CO)5{TeCN(Et)CH2CH2NEt}]

Abstract

Reaction of the electron-rich olefin [Et[graphic omitted]]₂ with tellurium affords the thermally or photochemically labile Et[graphic omitted]Te which reacts with [M(CO)₅(NCMe)](M = Cr, Mo, or W) or [NEt₄][MnBr₂(CO)₄] to yield [M(CO)₅{Te[graphic omitted]Et}] or cis-[Mn(Br)(CO)₄{Te[graphic omitted]Et}]; the compound [Cr(CO)₅{Te[graphic omitted]Et}] is readily detellurated to yield the carbenemetal complex [Cr(CO)₅{[graphic omitted]Et}]; the molecule of the title compound lies on a crystallographic mirror plane with the carbene ligand perpendicular to this plane and Te–Cr = 2·765(4), Te–C_carb= 2·12(2)Å, and ∠ Cr–Te–C_carb= 96·1(5)°.