| Section2 = | Section3 = }} N-Bromosuccinimide or NBS's a chemical reagent which's used in radical substitution and electrophilic addition reactions in organic chemistry. NBS can be considered a convenient source of cationic bromine. Chemistry Addition to alkenes NBS will react with alkenes 1 in aqueous solvents to give bromohydrins 2. The preferred conditions are the portionwise addition of NBS to a solution of the alkene in 50% aqueous DMSO, DME, THF, or tert-butanol at 0°C. Formation… (More on N-bromosuccinimide)