Allyltriethylsilane is an organosilicon compound primarily used in organic synthesis as a nucleophilic allylating agent. In the presence of Lewis acids, it undergoes the Sakurai allylation reaction to transfer the allyl group to electrophiles such as carbonyl compounds (aldehydes, ketones) and acetals, enabling efficient carbon-carbon bond formation. This reagent is particularly valuable in the total synthesis of natural products, pharmaceuticals, and other complex molecules where stereoselective allylation is required. Additionally, its silane moiety allows participation in hydrosilylation reactions for producing organosilicon intermediates. It also serves as a building block in the preparation of silicon-containing polymers and materials used in advanced coatings, adhesives, and functional materials.