ChTAPSO As an Efficient Ionic Liquid Catalyst for One-Pot Synthesis ofTetrahydro-4 H -chromenes and 3,4-Dihydropyrano c chromenes

摘要

Cholinium N-Tris(hydroxymethyl)methyl-3-amino-2-hydroxypropanesulfonate ChTAPSO has been found as an efficient ionic liquid catalyst for the synthesis of tetrahydro-4H-chromenes and 3,4-dihydropyranocchromenes in water and EtOH : Water (3 : 2) respectively. ChTAPSO being a basic IL has also been observed to extract acidic compounds such as rhodamine B from IL- immiscible organic solvent such as acetone through acid-base interaction. The extraction process of fluorescent dye rhodamine B was determined by ultraviolet-visible (UV-Vis) spectroscopy. The observed percentage extraction rate is 100 upto 6 mM solution of rhodamine in acetone. This method results in faster reaction with operational simplicity and excellent yields of the products. Furthermore, the catalyst has a great capacity for reutilisation.