OICC Press Iranian Journal of Catalysis 2345-4865 5 4 2024 02 03 An efficient synthesis of α,α’-benzylidene bis(4-hydroxycoumarin) derivatives catalyzed by Tl2O3 nanoparticles EN Mohammad Reza Nazarifar Department of Chemistry, Lamerd Branch, Islamic Azad University, Lamerd, Iran. Journal Article 2024 02 03 In this work, we attempted to synthesize thallium (III) oxide nano structures by direct thermal decomposition using thallium I phenylsuccinic acid coordination polymer [Tl(PsucH)]n as a precursor. Also, Tl2O3 nanoparticles have been characterized by scanning electron microscopy (SEM), X-Ray powder diffraction (XRD) and IR spectroscopy and then we report a simple and efficient method for the synthesis of α,α'-benzylidene bis(4-hydroxycoumarin) derivatives by aromatic aldehyde and 4-hydroxycoumarin by using Tl2O3 nanoparticles in H2O/EtOH at room temperature. A wide spectrum of functional groups, were tolerated in the developed protocol. The target molecules were obtained in good to excellent yield applying the current method. The catalyst can be recover for the subsequent reactions and reused without loss of activity.