N-Chloro Succinimide CAS No. 128-09-6

N-Chloro Succinimide CAS No. 128-09-6 About

N-Chlorosuccinimide (NCS), also known as 1-chloropyrrolidine-2,5-dione, is a white crystalline organic compound with the formula CHClNO widely used as a mild and selective chlorinating and oxidizing agent in organic synthesis. It is particularly valued for its ability to generate low, controlled concentrations of chlorine, making it useful for allylic and benzylic chlorination reactions, as well as for electrophilic addition to alkenes and aromatic substitution under controlled conditions. N-Chlorosuccinimide is more stable and easier to handle than molecular chlorine, which enhances laboratory safety and reaction selectivity. Beyond synthetic chemistry, it is also applied in pharmaceuticals, fine chemical production, and as a reagent in analytical and industrial processes requiring controlled halogenation.