An Efficient Microwave-Assisted Synthesis Method of Novel Bi2O3 Nanostructure and Its Application As a High-Performance Nanocatalyst in Preparing Benzylidene Barbituric Acid Derivatives

Abstract

In this study, controllable and optimal microwave irradiation has been used to synthesize the novel nanostructures of Bi2O3 under environmental conditions. The final products had a thermal stability of 210 °C, an average particle size distribution of 85 nm, and surface area of 783 m2/g. The high thermodynamic stability of Bi2O3 nanostructures were confirmed by TG and DSC analyses. The nanostructure nature of compounds, most importantly, the use of effective, cost effective and rapid synthesis route of microwave have created significant physiochemical properties in the Bi2O3 products. These unexpected properties have made the possibility of potentials application of these products in various fields, especially in nanocatalyst applications. It is well-documented that, as Lewis acid, bismuth nanocatalyst exhibits a great catalytic activity for the green synthesis of some bio-active barbituric acid derivatives using precursors with electron-donating or –withdrawing nature in high yields (80-98%). After incorporating this catalyst into the aqueous media, all the reactions were completed within 2-3 min at room temperature. The main advantages of this method are practical facility, the availability of starting materials, and low costs besides the catalyst reusability. Additionally, the catalyst synthesis process may be carried in the aqueous media during a short period with medium to high yields. The obtained results have opened a new window for development of a novel nanocatalyst with practical application.

Synthesis and characterization of an Fe-MOF@Fe3O4 nanocatalyst and its application as an organic nanocatalyst for one-pot synthesis of dihydropyrano[2,3-c]chromenes

“…Novel techniques have to be developed to overcome the disadvantages of previous approaches. Based on our previous experience in the synthesis of organic nanocatalysts for use in inorganic reactions (Yahyazadehfar et al, 2019;Yahyazadehfar et al, 2020;Moghaddam-Manesh et al, 2020), this study examined the application of the organic nanocatalyst, CB Fe-MOF@Fe 3 O 4 NFC, to synthesize the heterocyclic dihydropyrano[3, 2-c] chromene derivative via a threecomponent reaction involving malononitrile, aromatic aldehydes, and 4-hydroxycoumarin.…”

Fe3O4@iron-based metal–organic framework nanocomposite [Fe3O4@MOF (Fe) NC] as a recyclable magnetic nano-organocatalyst for the environment-friendly synthesis of pyrano[2,3-d]pyrimidine derivatives

“…In continuation of our attempts to the synthesis of heterocyclic compounds via MCR methodologies (Yahyazadehfar et al, 2019;Moghaddam-Manesh et al, 2020a;, 2 Experimental section…”