An efficient protocol for the eliminative deoxygenation of aliphatic and aromatic epoxides to olefins with polyphosphoric acid as a promoter

An efficient eliminative deoxygenation reaction is reported for the conversion of aliphatic and aromatic epoxides to olefins. Polyphosphoric acid (PPA) is used in 30mol% as a promoter to afford the products in excellent yield (85–96%) at 50°C under neat condition. Our method has advantages such as inexpensive reagents, high yield, stereoselective product in short reaction time under eco-friendly reaction conditions.