Magnetic-Nanoparticle-Supported 2,2′-Bis[3-(triethoxysilyl)propyl]imidazolium-Substituted Diethyl Ether Bis(tribromide): A Convenient Recyclable Reagent for Bromination

A new magnetic‐nanoparticle‐supported bromination reagent was synthesized by anchoring a 2,2′‐bis[3‐(triethoxysilyl)propyl]imidazolium‐substituted diethyl ether bis(tribromide) onto the surface of γ‐Fe2O3 nanoparticles and subsequently treating this new ionic liquid with bromine. The nanoparticle reagent was obtained with good loading levels and has been successfully used for the efficient bromination of a wide range of alkenes, alkynes, ketones, and aromatic substrates. More importantly, the reagent could be easily recovered by an external magnet and reused six times without significant loss of activity. A new maghemite nanoparticle bromination reagent has been prepared. The nanoparticle reagent was obtained with good loading levels and has been successfully used for the efficient bromination of a wide range of alkenes, alkynes, ketones, and aromatic substrates.