Bis(trimethylsilyl)acetamide
Bis(trimethylsilyl)acetamide (BSA) is an organosilicon compound with the formula  (Me = CH3). It is a colorless liquid that is soluble in diverse organic solvents, but reacts rapidly with moisture and solvents  containing OH and NH groups. It is used in analytical chemistry to increase the volatility of analytes, e.g., for gas chromatography. It is also used to introduce the trimethylsilyl protecting group in organic synthesis. A related reagent is N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA). Synthesis and reactions
BSA is prepared by treating acetamide with trimethylsilyl chloride in the presence of a base (Me = CH3, Et = C2H5):

The reaction of BSA with alcohols gives the corresponding trimethylsilyl ether, together with acetamide as a byproduct (Me = CH3):

References 

Reagents for organic chemistry
Trimethylsilyl compounds