Potassium trifluoro(4-nitrophenyl)borate is a specialty organoboron reagent widely used in organic synthesis, particularly as a nucleophilic partner in Suzuki-Miyaura cross-coupling reactions to form biaryl compounds. The electron-withdrawing nitro group activates the aryl moiety for efficient transfer in palladium-catalyzed processes. Its high stability in air and water makes it superior to boronic acids for applications in pharmaceutical, agrochemical, and materials synthesis, enabling the preparation of fluorinated or nitro-functionalized intermediates under mild conditions.