3-Carboxy-5-nitrophenylboronic acid can be used as a reactant to prepare: Biaryl derivatives via Suzuki-Miyaura cross-coupling with aryl and heteroaryl halides via the formation of a C-C bond ; 3-Chloro-5-nitrobenzoic acid via copper-catalyzed chlorination reaction; Aryl-clonazepam derivatives by palladium-catalyzed Suzuki Cross-coupling reaction with clonazepam in the presence of Pd as a catalyst. Reactant for: Copper-catalyzed chlorination ; Parallel solid-phase synthesis of azabicyclooctylidenemethylbenzamides as μ- and d-opioid agonists. Used for: Immobilization of glucose oxidase and acetylcholinesterase on boronic acid-activated silica surfaces.