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General Information:


CAS Number: 128-08-5

Molecular Weight: 177.98 g/mol

Appearance: White solid

Melting Point: 175-180 C

N-Bromosuccinimide (NBS) is a reagent typically used in radical substitution and electrophilic addition reactions. In pure form it exists as a white solid but over time it will decompose to give off bromine which will give it a slight yellow/brown color.

Common Uses:

Reagent in SEAr (Electrophilic Aromatic Substitution) brominations

Reagent in brominations at benzylic positions

Reagent in Appel reactions


1) WO2015144799, page 84

2) WO2012112946, page 165

3) WO2016014463, page 117

4) Wikipedia: N-Bromosuccinimide (link)

5) N-Bromosuccinimide (link)