Encapsulation of phosphotungstic acid in the nanostructure of metal-organic framework as a heterogonous catalyst used for Fries rearrangement of O-acyloxy benzenes in para-situation

Document Type : Original Article


Department of Chemistry, Payame Noor University, Tehran, Iran


In this study, the PTA @ MIL-53 (Fe) heterogeneous catalyst was synthesized to provide a suitable alternative to Lewis acids, including rare-earth metal triflates, AlCl3, and BF3, which have been used as catalysts for Fries rearrangements. This catalyst was synthesized using a mixture of FeCl3.6H2O, and 1, 4-benzenedicarboxylic acid (BDC) and PTA in DMF solvent in the ultrasonic bath. PTA encapsulation in MIL-53 (Fe) was confirmed using XRD, FT-IR, TGA, ICP and SEM techniques. The activity of PTA @ MIL-53 (Fe) catalytic in the Fries rearrangements of O-Acyloxy benzene reaction was investigated under ultrasound illumination and the effect of parameters such as reaction time, amount of catalyst and PTA percent in structure of catalyst on the yield was studied. The results show that increasing of all three parameters lead to increase yield upper than 98 percent.


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