RETRACTED ARTICLE: Construction of palladium complex supported on magnetic nanoparticles as an efficient recoverable nanocatalyst for synthesis of flavones through carbonylative annulation

Flavones and their derivatives are biologically and medicinally valuable compounds and have attracted the attention of many chemists. In this research project, we first synthesized the Fe₃O₄@AMBA-BiPy-Pd(0) nanocomposite through a simple method from the available materials, then we evaluated the application of its catalyst in the three-step synthesis of flavone derivatives. The structure of the synthesized nanocatalyst was well confirmed by several identification methods such as FT-IR, SEM, TEM, EDX, TGA, VSM, XRD and ICP-OES; it should be noted that the stability of the recovered Fe₃O₄@AMBA-BiPy-Pd(0) catalyst was also confirmed by VSM and ICP-OES techniques. The results confirmed that Fe₃O₄@AMBA-BiPy-Pd(0) nanocomposite is a highly efficient nanomagnetic catalyst because all flavone products were synthesized with very good yields under mild conditions. Based on the recycling experiments, the Fe₃O₄@AMBA-BiPy-Pd(0) catalyst was simply separated from the reaction mixture with an external magnet and could be reused 8 times without significantly reducing its efficiency.