4-(2-Hydroxypropan-2-yl)phenylboronic acid is an aromatic boronic acid derivative characterized by a tert-butyl alcohol substituent on the phenyl ring. This bifunctional structure combines a boronic acid group, a key handle for Suzuki-Miyaura cross-coupling reactions, with a bulky, polar hydroxyl-containing group. Its primary and significant application is in the field of organic electronics, particularly as a crucial building block (monomer) for the synthesis of organic light-emitting diode (OLED) materials. The boronic acid group enables the construction of conjugated molecular frameworks, while the 2-hydroxypropan-2-yl group can serve as a solubilizing moiety or influence the material's thermal properties, film-forming ability, and ultimately the device performance. It is used in the preparation of host materials, emitters, and charge-transporting layers for OLED displays and lighting. As a specialized boronic acid, it also falls under the category of organic synthesis building blocks. However, its design and use are highly targeted towards advanced material synthesis rather than general-purpose chemical synthesis, distinguishing it from more common arylboronic acids.