Electrochemical Reduction of Homo– and Hetero–tri(aryl)borohydrides

16 October 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Authentic terminal homo– and hetero–tri(aryl)borohydrides of the form [HB(C6F5)x{m,m–(CF3)2C6H3}y(C6Cl5)z] have been synthesised by reaction of their parent borane with a hydride source; their electrochemical properties have been studied, together with a computational investigation using density functional theory (DFT). The three of these compounds incorporating at least two pentachlorophenyl rings have been identified as, upon electrochemical oxidation, regenerating their parent borane, one of the essential steps (together with rapid cleavage under mild conditions of H2 together with an appropriate Lewis base), in implementing the electrochemically coupled – frustrated Lewis pair concept. The resulting mechanism upon oxidation is supported by modelling the cyclic voltammetry data obtained. The DFT studies have allowed for the structures of these compounds to be assessed, along with quantifying their hydride ion affinities (HIAs).


Borohydride Oxidation
Cyclic Voltammetry

Supplementary materials

Supplementary Information (ChemRxiv)


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