Tetrabutylammonium bromide Tetrapropylammonium bromide Tetraethylammonium Chloride Benzyltriethylammonium chloride Tetraethylammonium hydroxide 4,4'-Bis(diethylamino) benzophenone Tetrabutylphosphonium bromide Tetraethylene glycol dimethyl ether Tetraethylammonium tetrafluoroborate Tetrabutylammonium azide