Tri-vanadium Substituted Dawson-type Heteropolytungstate Nanocomposite (g-C ₃ N ₄ /Fe ₃ O ₄ @P ₂ W ₁₅ V ₃ ) as a Novel, Green, and Recyclable Nanomagnetic Catalyst in the Synthesis of Tetrahydrobenzo[b]Pyrans

Abstract

Among the important needs of human societies are the reduction of biological pollution and the use of environmentally friendly and inexpensive solvents. For the synthesis of medicinally important heterocycles, there is a need for an easy, efficient, and environmentally friendly catalytic protocol through multicomponent reaction (MCR). In this regard, the construction of multi-functional composites has been considered. A novel magnetic graphite carbon nitride decorated by tri-vanadium substituted Dawson-type heteropolytungstate nanocomposite (C3N4/Fe3O4@P2W15V3) effectively synthesized and characterized by prevalent functional analysis. This heterogeneous catalyst produced various tetrahydrobenzo[b]pyran derivatives in the presence of ethanol as a green solvent. Among the advantages observed for this method is the presence of a heterogeneous and reusable catalyst that is easily isolated and provides a high yield of products in a very short reaction time with high purity.