3-Hexyn-2-ol is an organic compound characterized by a terminal alkyne group and a secondary alcohol group separated by a methylene unit. It is a colorless to pale yellow liquid with a molecular formula of C6H10O. This bifunctional molecule serves as a versatile building block in organic synthesis. Its primary application is in research and development as a key intermediate for constructing more complex molecular architectures. The alkyne moiety is particularly valuable in metal-catalyzed cross-coupling reactions, such as Sonogashira couplings, to form conjugated systems. The hydroxyl group allows for further functionalization through esterification, etherification, or oxidation. It is commonly used in the synthesis of natural products, pharmaceuticals, and materials science precursors, where its structure enables the introduction of both rigidity and a handle for derivatization. As a specialized synthon, it is not a commodity chemical with broad industrial applications. Handling requires standard precautions for flammable liquids and potential irritants. Its utility lies in its role as a precise tool for synthetic chemists to access molecules containing conjugated enyne or diyne systems.