Trimethylsilyl chloride
= Trimethylsilyl chloride
<Trimethylsilyl chloride> is $\mathrm{Me_3SiCl}$. Reaction of an <oxygen> <nucleophile> at <silicon> can replace <chloride> and form a trimethylsilyl <ether>.
Trapping an <enolate> on <oxygen> forms a <silyl enol ether>. This preserves an enol-derived carbon-carbon <double bond> while changing the species' charge and handling properties.
<Organic Chemistry by John McMurry>[Alcohol protecting groups and silyl enol ethers]{ref}