Reaktionen der Borhydride B 3 H 7 und B 5 H 9 mit den ungesättigten Bor‐Stickstoff‐Verbindungen NB t Bu 2 und NB 2 t Bu 3

Reactions of the Boron Hydrides B 3 H 7 and B 5 H 9 with the Unsaturated Boron‐Nitrogen Compounds NB t Bu 2 and NB 2 t Bu 3 THF · B 3 H 7 reacts with RB≡NR ( 1 , R = t Bu) to yield the μ‐amino‐diborane(6) B 2 H 4 R(NHR) ( 5 ), which crystallizes in the triclinic space group P ī. The reaction of B 3 H 7 with the azadiboriridine NB 2 t Bu 3 ( 2 , R = t Bu) leads to the known NB 2 R 3 · BH 3 ( 4 ) and the novel (NB 2 R 3 ) 2 B 2 H 4 ( 6 ). Product 6 is considered to represent a diaza‐ arachno ‐octaborane derivative. The iminoborane 1 reacts with B 5 H 9 in the presence of lutidine (L) to give the ionic product [L – BR = NHR][B 9 H 14 ] ( 7 ); our earlier report on the formation of the aza‐ arachno ‐heptaborate [LH][NB 6 H 8 R 2 ] has to be revised. The products from the reaction of B 5 H 9 with NB 2 R 3 are 4 and 6 .