Oxarhodaborane chemistry: the formation of [µ-9,9′-O-{5-(η5-C5Me5)-nido-5-RhB9H12}2] and [7-(η5-C5Me5)-10-(NEt3)-nido-7, 12-RhOB10H10] from [nido-(η5-C5Me5)RhB10H13Cl]

Abstract

Chromatography in air on silica of the nido eleven-vertex metallaborane [(η⁵-C₅Me₅)RhB₁₀H₁₃Cl]2, yields the µ-9,9′-oxo-bridged bis(nido-5-rhodadecaboranyl) species [{(η⁵-C₅Me₅)RhB₉H₁₂}₂O]3, whereas treatment with NEt₃ before exposure to air and chromatography on silica results in the novel contiguous nido twelve-vertex oxarhodadecaborane [7-(η⁵-C₅Me₅)10-(NEt₃)-nido-7,12-RhOB₁₀H₁₀]4.