A clean, simple, highly efficient and eco-friendly benign method for the synthesis of 1, 8-dioxooctahydroxanthene 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. *Corresponding Authors

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Abstract.A simple, solvent free, highly efficient and eco-friendly protocol for the synthesis of tetrahydrobenzo[c] xanthene-8-ones derivatives using novel ionic liquid; L-pyrrolidine-2-carboxylic acid sulfate (LPCAS) as a catalyst has been reported. Important features of this methodology are excellent yield of products, cleaner reaction profile, environmentally friendly and the inexpensive catalyst.

A new Bronsted acidic ionic liquid, L-Pyrrolidine-2-carboxylic acid sulfate (LPCAS) was employed to promote one-pot synthesis of 14-aryl-14H-dibenzo [a,j] xanthenes via condensation reaction of aldehydes and 2-naphthol under solvent free condition. Distinguishing features of the methodology are excellent yield of products in shorter reaction time, cleaner reaction profile, ecofriendly nature and the use of inexpensive catalyst.

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