4-(Dihydroxyboryl)phenylacetylene, with CAS number 263368-72-5, is an organic compound featuring a phenylacetylene core functionalized with a boronic acid group. Its molecular structure combines an alkyne moiety, which is a versatile handle for cross-coupling reactions like Sonogashira coupling, with a boronic acid group, a key functional group for Suzuki-Miyaura cross-coupling reactions. This compound serves as a crucial building block in materials science, particularly for the synthesis of organic semiconductors and optoelectronic materials. The conjugated system formed by the phenylacetylene unit is essential for charge transport, while the boronic acid group allows for efficient polymerization or extension of the π-conjugated framework. It is widely used in the development of organic light-emitting diodes (OLEDs), organic photovoltaics (OPVs), and other advanced electronic devices. As a bifunctional synthon, it is also a valuable reagent in synthetic organic chemistry for constructing complex molecules and conjugated polymers. Its dual reactivity makes it a versatile precursor for creating novel materials with tailored electronic and optical properties.