Trimethylsilyl trifluoromethanesulfonate
Trimethylsilyl trifluoromethanesulfonate (TMSOTf) is an organosilicon compound with the formula . It is a colorless moisture-sensitive liquid. It is the trifluoromethanesulfonate derivative of trimethylsilyl. It is mainly used to activate ketones and aldehydes in organic synthesis. Reactions 
TMSOTf is quite sensitive toward hydrolysis:

It is far more electrophilic than trimethylsilyl chloride. Related to its tendency to hydrolyze, tmsOTf is effective for silylation of alcohols:

A common use of  is for the preparation of silyl enol ethers. One example involves the synthesis of the silyl enol ether of camphor:

It was also used in Takahashi Taxol total synthesis and in chemical glycosylation reactions. Trimethylsilyl trifluoromethanesulfonate has a variety of other specialized uses. I has been use to install tert-alkyl groups on phosphine (R = alkyl):
PH3  +  R3C–OAc  +  Me3SiOTf  →  [(R3C)2PH2]OTf

Deprotection of Boc-protected amines can be achieved using trimethylsilyl trifluoromethanesulfonate and triethylamine or 2,6-lutidine. References 

Trimethylsilyl compounds
Triflate esters