Reactions of vanadium, molybdenum and rhenium tris(pyrazolyl)borate-stabilised oxometal complexes with B(C6F5)3: crystal structures of [Mo{OB(C6F5)3}{HB(dmpz)3}(S2CNMe2)] and [Mo{OB(C6F5)3}{HB(dmpz)3}(OCH2CH2O)] (dmpz = 3,5-dimethylpyrazolyl)

Abstract

The tris(pyrazolyl)borate oxometal complexes [MoO{HB(dmpz)₃}L₂] (dmpz = 3,5-dimethylpyrazolyl, L₂ = OCH₂CH₂O or S₂CNMe₂), [VO{HB(dmpz)₃}(acac)] and [ReO{HB(pz)₃}L₂] [pz = pyrazolyl; L₂ = (OEt)₂, OCH₂CH₂O or C₂O₄] reacted with the strong Lewis acid B(C₆F₅)₃ at their MO functionality to yield stable Lewis acid–metal complex adducts. The structures of the complexes [Mo{OB(C₆F₅)₃}{HB(dmpz)₃}(S₂CNMe₂)] and [Mo{OB(C₆F₅)₃}{HB(dmpz)₃}(OCH₂CH₂O)] have been determined by X-ray crystallography.