L-Pyrrolidine-2-carboxylic acid sulfate (LPCAS): A new ionic liquid for the synthesis of 1,8-dioxooctahydroxanthenes

A clean, simple, highly efficient and eco-friendly benign method for the synthesis of 1, 8-dioxo-octahydroxanthene derivatives utilizing novel bronsted acidic ionic liquid; L-Pyrrolidine-2-carboxylic acid sulfate (LPCAS) as reagent been reported.   Distinguishing features of the methodology are excellent yield of products in shorter reaction time, cleaner reaction profile, environmentally friendly nature and the use of inexpensive reagent.