Diaza‐nido‐hexaborane, eine neue Klasse von Azaboranen

Diaza‐nido‐hexaboranes, a Novel Class of Azaboranes Iminoboranes RB  NtBu (R = Me, iPr, tBu) are haloborated by R′BHal2 to give diborylamines Hal  (R)B  N(tBu)  B ‐ (R′)  Hal (1a–d), the dehalogenation of which by Na/K‐alloy yields either the novel diaza‐nido‐hexaboranes tBu2N2B4R2R2 (2a – c, R/R′ = Me/Me, iPr/iPr, tBu/iPr) or the azadiboriridine B2NtBu3 (3d), respectively. Product 2a crystallizes in the space group Cmcm, Z = 4. The N2B4 skeleton of 2a represents the nido‐fragment of pentagonal bipyramid with a missing vertex at the base.