Lewis Acidic Ionic Liquid Immobilized on Graphene Oxide: Synthesis, Characterization, and Application in the Ultrasound‐Assisted Condensation Reactions

The catalytic activity of a novel Lewis acidic Fe(III)/caffeine‐based ionic liquid immobilized on graphene oxide (Caff‐IL‐GO/Fe) was studied in three condensation reactions in water under sonication. This catalyst was characterized by Fourier‐transform infrared spectroscopy, proton nuclear magnetic resonance, thermal gravimetric analysis, energy‐dispersive X‐ray spectroscopy, field emission scanning electron microscopy, powder X‐ray diffraction,...