Abstract Ethylenebis (N-methylimidazolium) ditribromide, a stable crystalline solid, is easily prepared by reaction of the corresponding dibromide salt with bromine in n-hexane. 1, 3- Diketones and β-ketoesters can be brominated chemoselectively to the corresponding α- monobrominated products by using this reagent at 0–5° C. Under the same reaction conditions, diethyl malonate, ethyl cyanoacetate, and malonitrile were monobrominated at ...
