Adducts of the Lewis acid [B(C6F5)3] with transition metal oxo compounds

Abstract

The oxo anions [WO₄]^2– and [ReO₄]^– react with the Lewis acid molecule [B(C₆F₅)₃] to give the tris-adduct [WO{OB(C₆F₅)₃}₃]^2– or the mono adduct [ReO₃{OB(C₆F₅)₃}]^– respectively. The crystal structure of the salt [ⁿPr₄N]₂[WO{OB(C₆F₅)₃}₃] has been determined. The η-cyclopentadienyl-oxo compounds [Re(η-C₅R₅)O₃] (where R = H or Me) react with [B(C₆F₅)₃] giving the mono adducts [(η-C₅R₅)ReO₂{OB(C₆F₅)₃}] and the crystal structure of the compound where R = H has been determined. The triazacyclononane compounds [LMO₃] (where L = N,N′,N″-trimethyl-1,4,7-triazacyclononane and M = Mo or W) with [B(C₆F₅)₃] give the mono adducts [LMO₂{OB(C₆F₅)₃}] and the crystal structure of the tungsten compound is reported. The compound [Re{HB(pz)₃}O₃] [where {HB(pz)₃} = hydridotris(1-pyrazolyl) borate] and [B(C₆F₅)₃] gives the mono adduct [HB(pz)₃ReO₂{OB(C₆F₅)₃}].