Tetraethylsilane is an organosilicon compound with the chemical formula . It is a colorless liquid. Under standard coditions, it does not react with water, air, nitric acid or concentrated potassium hydroxide. Its vapor density is 4.98, relative to air (air = 1).
The synthesis of tetraethylsilane by reacting silicon tetrachloride with diethylmercury or diethylzinc in an ampoule at was first reported in 1863 by Charles Friedel and James Mason Crafts.
Tetraethylsilane reacts with halides of the boron group elements, such as boron tribromide or gallium trichloride with high yield and purity to form the corresponding dihaloethyl compound.