11B NMR studies of the thermal decomposition of ammoniaborane in solution

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane†

“…7 Dehydrogenation of AB is extensively investigated by in-situ solidstate 11 B NMR spectroscopy. [8][9][10][11] Key intermediates of dehydrogenation process are detected by Shaw et al, 11 allowing the authors to propose a mechanism. Their findings are highly consistent with in-depth high-level theoretical study by Zimmerman et al, 4,5 published simultaneously, but independently.…”

The Role of Free N‐Heterocyclic Carbene (NHC) in the Catalytic Dehydrogenation of Ammonia–Borane in the Nickel NHC System

“…[10,11] Because our results show that free NHC dehydrogenates AB, we investigated the possibility that aminoborane species containing sp 3 boron and nitrogen atoms could be activated in a similar manner to release the second equivalent of H 2 from AB. Specifically, the reactivities of NH 3 BH 2 NH 2 BH 3 , [22] cyclic (NH 2 BH 2 ) 2 , [22,23] cyclic (NH 2 BH 2 ) 3 , [24,25] and cyclic (B 2 N 2 H 7 -NH 2 BH 3 ) [26] are considered. Table 1 lists the barriers for dehydrogenation of these species by Enders NHC.…”

An investigation on the synthesis of borazine

“…A strong doublet at 28.2 ppm (J BH = 136 Hz) of borazine was observed. Besides, there appeared some other weak resonances at À28.9 ppm, À24.8 ppm, À13.5 ppm resulting from l-aminodibora- position of ammonia borane in ether solvents [18]. In addition, it was reported that the thermal decomposition of cyclotriborazane in glymes caused dehydrogenation leading to the formation of borazine as the main product [14].…”