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The first stable copper borohydride complex (CAAC)CuBH4 CAAC = cyclic(alkyl)(amino)carbene bearing a single monodentate ligand was prepared by addition of NaBH4 or BH3NH3 to the corresponding (CAAC)CuCl complex. Both complexes are air-stable and promote the catalytic hydrolytic dehydrogenation of ammonia borane. The amount of hydrogen released reaches 2.8 H2/BH3 NH3 with a turnover frequency of 8400 mol H2 molcat(-1) h(-1) at 25 °C. In a fifteen-cycle experiment, the catalyst was reused without any loss of efficiency.
Hu et al. (Fri,) studied this question.