N-bromosuccinimide, also known as N-bromosuccinimide, English name: N-bromosucciinimide, abbreviated as NBS, is an important brominating agent in organic synthesis, bromination reaction has the advantages of mild reaction conditions, good selectivity, high yield, easy separation of products Chemicalbook, etc., is used in allyl, benzyl free radical bromination reaction; electrophilic bromination of ketones, aromatic compounds or heterocyclic compounds and addition reactions of olefins; It is also widely used as a catalyst and oxidant, and is a commonly used bromination reagent in the chemical and pharmaceutical industries.