Facile Synthesis of Aminodiborane and Inorganic Butane Analogue NH₃BH₂NH₂BH₃

Abstract

A new ambient-temperature, catalyst-free reaction between ammonia borane and tetrahydrofuran borane produces aminodiborane via the formation of a dihydrogen bond and subsequent molecular hydrogen elimination. The facile synthesis of aminodiborane will make this long-sought active chemical reagent readily available for both inorganic and organic reactions. From aminodiborane, an inorganic butane analogue, NH(3)BH(2)NH(2)BH(3), was prepared, and its single-crystal structure displayed a gauche rather than an anti form conformation.

The Catalytic Dehydrocoupling of Amine–Boranes and Phosphine–Boranes

“…2.8.3) [28]. Shore and co-workers have also reported the synthesis by stoichiometric methods of the H 3 B · NH 3 analogue, H 3 B · NH 2 BH 2 · NH 3 [34], while Sneddon and co-workers have reported the synthesis of triborazanes, such as H 3 B · (NH 2 BH 2 ) 2 · NH 3 [35], which are implicated in dehydropolymerisation processes [36].…”

Anti and gauche conformers of an inorganic butane analogue, NH3BH2NH2BH3

“…3 Although DDAB and butane are isoelectronic, their physical properties are remarkably different. DDAB is a white crystalline powder that melts at 62 1C while butane is a gas at room temperature, melting at À134 1C.…”

“…8,9 We have recently elucidated the role of dihydrogen bonds in promoting reactivity in a few N,B compounds. 3 The formation of an intramolecular dihydrogen bond and subsequent molecular hydrogen elimination are the bases of a convenient synthesis of aminodiborane (NH 2 B 2 H 5 , ADB) in a ambient-temperature, catalyst-free reaction between ammonia borane (NH 3 BH 3 , AB) and tetrahydrofuran borane, THFÁBH 3 .…”

“…Commun., 2012,48,[7943][7944][7945] Anti and gauche conformers of an inorganic butane analogue, NH 3 The crystal structures of an inorganic butane analogue, NH 3 BH 2 NH 2 BH 3 (DDAB), were determined using single crystal X-ray diffraction, revealing both anti and gauche conformations. The anti conformation is stabilized by intermolecular dihydrogen bonds in the crystal whereas two gauche conformations of DDAB observed in its 18-crown-6 adducts are stabilized by an intramolecular dihydrogen bond.…”

Ein Weg zu gemischten Pnictogenylboranen

“…Neben kationischen (I, [17] IV), [18] neutralen (II, [19] V) [20] und anionischen (III, [21] VI) [22] Gruppe-13/15-Ketten konnten wir zeigen, dass LB-stabilisierte Pnictogenylborane vielseitige Ausgangsmaterialien fürdie Synthese von ionischen Gruppe-13/15-Verbindungen sind. Bei der Koordination an IBH 2 -LB (LB = NMe 3 ,S Me 2 )k çnnen kationische Ketten synthetisiert werden (VII).…”