Microwave Assisted Multi-component Synthesis of 4Hchromene Derivatives by Nano-coconut Shell-BF3 as a New Heterogeneous Catalyst

Document Type: Research Paper

Authors

Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran

Abstract

Microwave assisted reactions have gained considerable attention, due to versatility and reduction of
solvent and reaction time. The reaction of a nano-coconut shell and boron tri-fluoride in diethyl
ether solvent resulted in preparation of nano-coconut shell-BF3 as a catalyst. The nano-coconut
shell-BF3 catalyst has been characterized by fourier transform infrared spectroscopy (FT-IR), field
emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM).
Nano-coconut shell-BF3 has been applied as a new heterogeneous catalyst for synthesis of 4Hchromene
derivatives from the simple one-pot reaction between aryl aldehydes, cyclic 1,3-diketone
and, malononitrile under microwave reaction. Cleanliness, simple methodology, short time, and
excellent yields of products are some advantages of this method.

Keywords