(Trimethylsilyl)methyl chloride is the organosilicon compound with the formula (CH<sub>3</sub>)<sub>3</sub>SiCH<sub>2</sub>Cl. A colorless, volatile liquid, it is an alkylating agent that is employed in organic synthesis, especially as a precursor to (trimethylsilyl)methyllithium. In the presence of triphenylphosphine, it olefinates benzophenones: