Tetrabutylammonium chloride

Tetrabutylammonium chloride is the organic compound with the formula [(CH3CH2CH2CH2)4N]+Cl−, often abbreviated as [Bu4N]Cl, where Bu stands for n-butyl. A white water-soluble solid, it is a quaternary ammonium salt of chloride. It is a precursor to other tetrabutylammonium salts. Often tetrabutylammonium bromide is preferred as a source of tetrabutylammonium because it is less hygroscopic than the chloride.