Potassium 3-hydroxyphenyltrifluoroborate is an organoboron reagent, specifically an aryltrifluoroborate salt. It features a phenyl ring substituted with a hydroxyl group at the meta position and a potassium trifluoroborate group. This compound is a stable, air- and moisture-tolerant solid, making it a practical alternative to traditional boronic acids in many synthetic applications. Its primary utility lies in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. The trifluoroborate moiety serves as a protected form of the boronic acid, offering enhanced stability while remaining reactive under standard palladium-catalyzed coupling conditions. The presence of the phenolic hydroxyl group makes it a versatile building block for constructing biaryl structures containing a phenol functionality, which are common motifs in pharmaceuticals, agrochemicals, and advanced materials. It is frequently employed in the synthesis of complex molecules, including potential drug candidates and their intermediates. As a bifunctional reagent (bearing both a coupling handle and a reactive hydroxyl group), it allows for sequential functionalization, streamlining the synthesis of diversely substituted aromatic compounds. Its stability simplifies handling and storage compared to its boronic acid counterpart.