Issue 23, 2021

Metal–ligand cooperative κ1-N-pyrazolate Cp*RhIII-catalysts for dehydrogenation of dimethylamine-borane at room temperature

Abstract

3,5-Dimethylpyrazole (Pz*H) in well-defined Cp*RhIII (Cp* = 1,2,3,4,5-pentamethylcyclopentadienyl) complexes, or as an additive to [Cp*RhCl2]2 enhances catalytic activity in the dehydrogenation of dimethylamine-borane (DMAB) at room-temperature. Mechanistic studies indicate that the Lewis acidic RhIII-centre and dangling N-atom of the Pz* fragment operate cooperatively in accepting a hydride and proton from DMAB, respectively, leading directly to dimethylamino-borane and a RhIII–H complex. The rate limiting step involves protonation of the RhIII–H by the proximal NH fragment of the Pz*H moiety.

Graphical abstract: Metal–ligand cooperative κ1-N-pyrazolate Cp*RhIII-catalysts for dehydrogenation of dimethylamine-borane at room temperature

Supplementary files

Article information

Article type
Communication
Submitted
25 May 2021
Accepted
27 May 2021
First published
03 Jun 2021

Dalton Trans., 2021,50, 7938-7943

Metal–ligand cooperative κ1-N-pyrazolate Cp*RhIII-catalysts for dehydrogenation of dimethylamine-borane at room temperature

S. Pal, T. Iwasaki and K. Nozaki, Dalton Trans., 2021, 50, 7938 DOI: 10.1039/D1DT01705E

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