A facile, convenient, green and environmentally benign one-pot three-component synthesis of poly-functionalized 4H-pyrans and 4H-chromenes is described. A basic ionic liquid 2-(2-hydroxyethoxy)ethaneammonium formate was found to be an efficient catalyst or catalytically active solvent for the synthesis of those important classes of heterocyclic compounds.

The chemical waste generated in today’s microelectronic fabrication processes has driven the need to develop a more environmentally benign process. Silicone fluids are linear methyl siloxanes that are non-toxic, not ozonedepleting and can be easily recycled. They are used as environmentally friendly alternatives in this study to develop conventional photoresists. After silylation, two conventio...