Iranian Research Organization for Science and Technology Journal of Particle Science and Technology 2423-4087 5 1 2019 06 30 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 61 69 831 10.22104/jpst.2019.831 EN Nabi Nemat-Bakhsh Department of Chemistry, Faculty of Sciences, Najafabad Branch, Islamic Azad University, Najafabad, Iran Majid Ghashang Department of Chemistry, Faculty of Sciences, Najafabad Branch, Islamic Azad University, Najafabad, Iran Journal Article 2019 01 05 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. https://jpst.irost.ir/article_831_e0ec453e28e061cc58ac43f91dc2f3f0.pdf