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Spontaneous Metal‐Free Transfer Hydrogenation of Iminoboranes with Ammonia Borane and Amine Boranes
Authors:Lena Winner  Dr William C Ewing  Prof K Geetharani  Dr Theresa Dellermann  Brian Jouppi  Dr Thomas Kupfer  Dr Marius Schäfer  Prof Dr Holger Braunschweig
Institution:1. Institut for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universit?t Würzburg, Würzburg, Germany;2. Boron Specialties, LLC, Ambridge, PA, USA;3. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore-, India
Abstract:The first spontaneous, metal‐free, room‐temperature hydrogen transfer from ammonia borane to an iminoborane is reported. Mechanistic studies of the reaction indicate a concerted transfer of H+ and H? from donor to acceptor with an activation energy far below those of comparable concerted transfer hydrogenations. This reaction was employed in the syntheses and isolation of new B,N‐disubstituted aminoboranes, a comparatively rare subset within the aminoborane family. This successful transfer hydrogenation to a highly dehydrogenated BN system may serve as a starting point for the design of new systems capable of reversible dehydrogenation/rehydrogenation.
Keywords:amine boranes  boron  hydrogen transfer  hydrogenation  main-group elements
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