Diaza‐ nido ‐hexaborane, eine neue Klasse von Azaboranen

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