Preparation of poly(vinylbenzyltriphenylphosphonium perbromide) and its application in the bromination of organic compounds

Abstract

Insoluble poly(vinylbenzyltriphenylphosphonium perbromide) was prepared by the chemical modification of 2% crosslinked poly( p-bromomethylstyrene) with triphenylphosphine followed by treatment of the obtained polymeric salt with bromine. The activity of the resulting polymeric brominating reagent was compared with that of the low molecular weight model reagent in the direct brominations of alkenes and carbonyl compounds. In addition to the excellent yields of the brominated products and the ease and simplicity of the method, the resulting polymeric by-product could be simply regenerated to give the reagent without loss of activity.