Abstract
Contributions to the Chemistry of Boron, 213[1]. – Reactions of an Amino–imino–borane with Triborane(7) and Decaborane(14)Triborane(7)‐THF hydroborates (tert‐butylimino)(tetramethylpiperidino)borane 1 slowly to form μ‐(tert‐butylamino)‐μ‐(tetramethylpiperidino)tetraborane(8) 5. This molecule shows fluxional behaviour at ambient temperature in solution. In the solid state, an X–ray structure analysis reveals the presence of the asymmetric 1104–styx valence tautomer. 1 does not react at ambient temperature with pentaborane(9) in dichloromethane/hexane solution. However, 1 reacts rapidly with decaborane(14) to produce a tetramethylpiperidine adduct of an 11‐(tert‐butylamino)undecaborane(14) as determined by an X–ray structure analysis. The same kind of reaction occurs between decaborane(14) and (2,6–diisopropylphenylimino)‐(2,2,6,6–tetramethylpiperidino)borane. Thus, decaborane(14) acts as a diprotic acid towards amino–imino–boranes.
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