Sodium triethylborohydride is an organoboron compound with the formula NaBH(C<sub>2</sub>H<sub>5</sub>)<sub>3</sub>. It is a colorless, pyrophoric solid that is commercially available in toluene solution, unlike the related LiBH(C<sub>2</sub>H<sub>5</sub>)<sub>3</sub> which is typically sold as a THF solution. It is commonly used for the reductive activation of homogeneous catalysts, converting metal halides to hydrides. Sodium triethylborohydride has been prepared by treating a hot toluene slurry of sodium hydride with triethylborane. The trimethylborohydride analogue, which is assumed to be structurally similar to the triethylborohydride, adopts a tetrameric structure in toluene solution. NaBHEt<sub>3</sub> forms a dimeric adduct with TMEDA.