Ionic Liquid–Mediated Synthesis of Coumarin-3-carboxylic Acids via Knoevenagel Condensation of Meldrum's Acid with ortho-Hydroxyaryl Aldehydes

Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

“…529 A representative example is shown in Figure 21. Of the ILs used, HMIm TFA had superior properties, leading to yields between 65% and 90 %, and conversions between 75% and 99% in 45−60 min.…”

The synthesis of coumarin derivatives using choline chloride/zinc chloride as a deep eutectic solvent

“…It should be mentioned that using another ionic liquids and basic DES in the synthesis of coumarin derivatives has been previously reported [11,[33][34][35][36][37] and we have only focused on acidic DESs in this synthesis. When ChCl.…”

Recent developments of task-specific ionic liquids in organic synthesis

“…Recently, Redel and co-workers (35) have synthesized stable cobalt, rhodium, and iridium nanoparticles by thermal decomposition under argon from Co 2 (CO) 8 , Rh 6 (CO) 16 and Ir 4 (CO) 12 Cal et al (36) reported the use of palladium nanoparticle for Ullmann reactions in tetrabutyl ammonium salt ILs as a reservoir of catalyst with aldehydes as the reductant (Scheme 13). This type of ''ligand-free'' catalysis is gaining considerable importance because it avoids the use of toxic or expensive phosphine ligands and allows catalyst recycling.…”