Used primarily as a building block in organic synthesis, especially in the development of pharmaceuticals and agrochemicals. Its strained cyclopropyl-ethynyl structure makes it valuable in cross-coupling reactions and cycloadditions, enabling the construction of complex molecular frameworks. It is also employed in the synthesis of bioactive compounds where the ethynylcyclopropane moiety contributes to metabolic stability and target binding. Additionally, it serves as an intermediate in the preparation of functionalized aromatic systems for materials science applications.