Synthesis of a novel bifunctional oxyammonium‐based ionic liquid: Application for the synthesis of pyrano[4,3‐b]pyrans and tetrahydrobenzo[b]pyrans

Abstract

AbstractIn the present investigation, a novel bifunctional oxyammonium‐based ionic liquid, namely, 2,2′‐(ethane‐1,2‐diylbis[oxy])bis(ethan‐1‐aminium)‐2,2,2‐trifluoroacetate, was designed and synthesized. The structure of the titled ionic liquid was characterized using Fourier‐transform infrared spectroscopy (FT‐IR), proton nuclear magnetic resonance (1HNMR), carbon nuclear magnetic resonance (13CNMR), fluorine nuclear magnetic resonance (19FNMR), homonuclear COSY nuclear magnetic resonance (NMR), thermogravimetry (TG), derivative thermogravimetry (DTG) analysis, X‐ray diffraction patterns (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The described ionic liquid demonstrated robust catalytic performance in the synthesis of pyrano[4,3‐b]pyrans and tetrahydrobenzo[b]pyran derivatives. The ionic liquid presents a high potential of recycling and reusing capability in both types of model reactions.