NHI- and NHC-supported Al(III) hydrides for amine–borane dehydrocoupling catalysis

Weetman, Catherine and Ito, Nozomi and Unno, Masafumi and Hanusch, Franziska and Inoue, Shigeyoshi (2019) NHI- and NHC-supported Al(III) hydrides for amine–borane dehydrocoupling catalysis. Inorganics, 7 (8). 92. ISSN 2304-6740 (https://doi.org/10.3390/inorganics7080092)

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The catalytic dehydrocoupling of amine–boranes has recently received a great deal of attention due to its potential in hydrogen storage applications. The use of aluminum catalysts for this transformation would provide an additional cost-effective and sustainable approach towards the hydrogen economy. Herein, we report the use of both N-heterocyclic imine (NHI)- and carbene (NHC)-supported Al(III) hydrides and their role in the catalytic dehydrocoupling of Me2NHBH3. Differences in the σ-donating ability of the ligand class resulted in a more stable catalyst for NHI-Al(III) hydrides, whereas a deactivation pathway was found in the case of NHC-Al(III) hydrides.