89061-79-0Relevant academic research and scientific papers
Nitrogen-Based Ligands Accelerate Ammonia Borane Dehydrogenation with the Shvo Catalyst
Zhang, Xingyue,Lu, Zhiyao,Foellmer, Lena K.,Williams, Travis J.
, p. 3732 - 3738 (2015)
(Chemical Equation Presented) We previously reported that quantitative poisoning, a test for homogeneous catalysis, behaves oddly in the dehydrogenation of ammonia borane (AB) by Shvo's catalyst, whereas the "poison" 1,10-phenanthroline (phen) accelerates catalysis and apparently prevents catalyst deactivation. Thus, we proposed a protective role for phen in the catalysis. Herein we account for the mechanistic origin of this accelerated AB dehydrogenation in the presence of phen and define the relevance boundaries of our prior proposal. In so doing, we present syntheses for novel amine- and pyridine-ligated homologues of the Shvo catalyst and show their catalytic efficacy in AB dehydrogenation. These catalysts are synthetically easy to access, air stable, and rapidly release over 2 equiv of H2. The mechanisms of these reactions are also discussed.
Donor-acceptor complexation and dehydrogenation chemistry of aminoboranes
Malcolm, Adam C.,Sabourin, Kyle J.,McDonald, Robert,Ferguson, Michael J.,Rivard, Eric
, p. 12905 - 12916 (2013/02/22)
A series of formal donor-acceptor adducts of aminoborane (H 2BNH2) and its N-substituted analogues (H 2BNRR′) were prepared: LB-H2BNRR′2- BH3 (LB = DMAP, IPr, IPrCH2 and PCy3; R and R′ = H, Me or tBu; IPr = [(HCNDipp)2C:] and Dipp = 2,6-iPr 2C6H3). To potentially access complexes of molecular boron nitride, LB-BN-LA (LA = Lewis acid), preliminary dehydrogenation chemistry involving the parent aminoborane adducts LB-H2BNH 2-BH3 was investigated using [Rh(COD)Cl]2, CuBr, and NiBr2 as dehydrogenation catalysts. In place of isolating the intended dehydrogenated BN donor-acceptor complexes, the formation of borazine was noted as a major product. Attempts to prepare the fluoroarylborane-capped aminoborane complexes, LB-H2BNH 2-B(C6F5)3, are also described.
