Allyldimethylsilane is primarily used in organic synthesis as a versatile reagent for introducing silicon-containing functional groups into molecules. Its allyl group makes it particularly useful in hydrosilylation reactions, where it can add across double or triple bonds in alkenes and alkynes, forming organosilicon compounds. These compounds are valuable intermediates in the production of silicone polymers, coatings, and adhesives. Additionally, allyldimethylsilane is employed in the modification of surfaces to impart hydrophobic properties, which is useful in water-repellent coatings and materials. Its reactivity also makes it a key component in the synthesis of specialty chemicals and pharmaceuticals, where silicon incorporation can enhance stability or alter biological activity.