Zn2sno4 Nanostructure As An Efficient Catalyst For the Preparation of Pyrano[3,2-C]Chromene And Pyrano[4,3-B]Pyran Derivatives Under Ultrasonic Irradiation Conditions

We plan to study the synthesis of zn2sno4 nanoparticles via a sol-gel method and evaluate their catalytic activity in the three-component reaction including active enolates, active methylene, and aldehydes leading to the formation of the pyran derivatives. functionalized pyrano[3,2-c]chromenes and pyrano[4,3-b]pyran derivatives were synthesized via a one-pot, a three-component reaction under ultrasonic irradiation conditions in good to excellent yields. the catalyst was characterized by xrd, fesem and tem analyses.