Deboronation of ortho-carborane by an iminophosphorane: crystal structures of the novel carborane adduct nido-C2B10H12·HNP(NMe2)3 and the borenium salt [(Me2N)3PNHBNP(NMe2)3]2O2+(C2B9H12–)2

Abstract

The structures of the adduct nido-C₂B₁₀H₁₂·HNP(NMe₂)₃ and the borenium salt [(Me₂N)₃PNHBNP(NMe₂)₃]₂O²⁺(C₂B₉H₁₂^–)₂, both obtained from 1,2-C₂B₁₀H₁₂ and HNP(NMe₂)₃, were determined by X-ray crystallography; the adduct represents the first structurally determined carborane of its type, a possible intermediate in the well known conversion of closo-1,2-C₂B₁₀H₁₂ into the nido-7,8-C₂B₉H₁₂^– anion by bases.