The N-octylquinolinium tribromide has been synthesized and explored as a new efficient brominating agent. It has high active bromine content per molecule and shows a remarkable reactivity towards various substrates. No organic solvent has been used during any stage of the reaction. The N-octylquinolinium tribromide is stable for months and acts as a safe source of bromine for complete bromination of phenols, aromatic amines, alkenes and alkynes.