Reactions of ((organosilyl)amino)(alkylamino)boranes with selected hydrides

Article abstract of DOI:10.1021/ic00136a068

Reductions of ((organosilyl)amino)(alkylamino)boranes with selected hydrides were studied in order to further clarify the reaction pathway of reactions between LiBH₄ and chlorobis(amino)boranes which contained an (organosilyl)amino group. A clear liquid which was identified as a mixture of s-Bu₂NBH₂ and (Me₃Si)₂NBH₂ was obtained from a reaction between s-Bu₂NB(Cl)N(SiMe₃)₂ and LiBH₄. The reaction of s-Bu₂NB(H)N(SiMe₃)₂ with THF·BH₃ resulted in the formation of n-BuOB(H)N(SiMe₃)₂ and s-Bu₂NBH₂. The compounds s-Bu₂NB(Cl)N(SiMe₃)₂ and s-Bu₂NB(H)N(SiMe₃)₂ were prepared by allowing (Me₃Si)₂NLi to react with s-Bu₂NBCl₂ and s-Bu₂NBClH, respectively. The compound s-Bu₂BClH was isolated from a reaction involving s-Bu₂NBCl₂ and LiBH₄ in a 1:1 mole ratio. In the reaction between s-Bu₂NB(Cl)N(H)SiMe₃ and LiBH₄, s-Bu₂NBH₂, (Me₃Si)₂HN₃B₃H₃, and [Me₃SiNBH]₃ were isolated. The same products were obtained from the reaction of s-Bu₂NB(H)N(H)SiMe₃ with THF·BH₃. However, s-Bu₂NBH₂, s-Bu₂NBClH, and s-Bu₂NH₂Cl were isolated from the reaction of s-Bu₂NB(Cl)N(H)SiMe₃ with THF·BH₃. The compounds s-Bu₂NB(Cl)N(H)SiMe₃ and s-Bu₂NB(H)N(H)SiMe₃ were prepared by allowing (Me₃Si)₂NH to react with s-Bu₂NBCl₂ and s-Bu₂NBClH, respectively.