is commercially available, but can be prepared by the reaction between tetraethylammonium hydroxide and hydrobromic acid:

:Et₄N⁺HO^- + HBr -> Et₄N⁺Br^- + H₂O

Evaporation of the water and recrystallization from acetonitrile yields a crystalline sample of TEAB.

Structure

The crystal structure of TEAB has been determined and found to exhibit a