Triethylsilane Hexamethyldisilane (TMS2) is the organosilicon compound with the formula Si2(CH3)6, abbreviated Si2Me6.

It is a colourless liquid, soluble in organic solvents.

[1] Hexamethyldisilane can be produced by Wurtz-like coupling of trimethylsilyl chloride in the presence of a reducing agent such as potassium graphite: With an excess of the reductant, the alkali metal silyl derivative is produced:[2] The Si-Si bond in hexamethyldisilane is cleaved by strong nucleophiles and electrophiles.

Alkyl lithium compounds react as follows: Iodine gives trimethylsilyl iodide.

[3]