(3-Bromopropyl)trimethylammonium Bromide (CAS# 3779-42-8) is a compound used to prepare novel hydrophilic-hydrophobic block copolymer based on cardo poly(arylene ether sulfone)s with bis-quaternary ammonium moieties for anion exchange membranes.

(3-Bromopropyl)triphenylphosphonium Bromide (CAS# 3607-17-8) is used in rearrangement reactions of cyclic organic molecules and in organic synthesis.