Wikipedia
Hexamethyldisiloxane
Hexamethyldisiloxane (HMDSO) is an organosilicon compound with the formula O[Si(CH)]. This volatile colourless liquid is used as a solvent and as a reagent in organic synthesis. It is prepared by the hydrolysis of trimethylsilyl chloride. The molecule is the protypical di siloxane and resembles a subunit of polydimethylsiloxane.