Construction of copper(I) complex immobilized on magnetic Fe₃O₄ nanoparticles [Fe₃O₄@BBI-CuBr]: a green and highly efficient nanomagnetic catalyst for three-component preparation of diaryl sulfones

In order to prepare diaryl sulfones, in this paper, copper(I) complex immobilized on magnetic Fe3O4 nanoparticles [Fe3O4@BBI-CuBr] was constructed and used as a green and highly efficient nanomagnetic catalyst for the sulfonylative-Suzuki-Miyaura cross-coupling reaction of aryl iodides with arylboronic acids and DABSO (as SO2 source). The as-constructed Fe3O4@BBI-CuBr nanocatalyst were well identified by some spectroscopic techniques. Using this methodology, various diaryl sulfones were synthesized with good to excellent efficiency, the reactions were carried out in a green and mild environment, the Fe3O4@BBI-CuBr catalyst was easily separated from the reaction mixture by a magnet and reused several times. It is worth noting that the XRD, TEM and ICP-OES techniques showed that the reused catalyst still has high stability and catalytic activity after 7 times.