Synthesis of Fe3O4@SiO2-Au/Cu magnetic nanoparticles and its efficient catalytic performance for the Ullmann coupling reaction of bromamine acid

Over bimetallic Au/Cu catalyst supported on magnetic Fe3O4 nanoparticles, water-mediated bromamine acid could be selectively converted into 4,4′-diamino-1,1′-dianthraquinonyl-3,3′-disulfonic acid (DAS) with a yield of 88.67%. The magnetic catalyst could be readily separated and reused.