Bahareh Abbas khakiani - Department of Chemistry, College of Science, University of Guilan, Rasht, Iran
Nader Daneshvar - Department of Chemistry, University campus ۲, University of Guilan, Rasht, Iran
Hasan Tajik - Department of Chemistry, University campus ۲, University of Guilan, Rasht, Iran
Farhad Shirini - Department of Chemistry, College of Science, University of Guilan, Rasht, Iran,Department of Chemistry, University campus ۲, University of Guilan, Rasht, Iran

Xanthenes are biologically important drug intermediates for the synthesis of compounds having antibacterial, anti-inflammatory and antiviral activities [1]. Also,they were used as dyes in laser technologies, and in fluorescent materials for visualization of biomolecules. Because of these significant features there has been a continuous interest in the synthesis of these types of compounds and consequently numerous approaches have been reported for their synthesis [2]. Ionic liquids have received considerable interest as eco-friendly solvents, catalysts and reagents in organic synthesis because of their unique properties, such as low volatility, non-flammability, high thermal stability, negligible vapor pressure and ability to dissolve a wide range of materials [3]. In this work, a dicationic ionic liquid based on benzimidazole is simply prepared andafter is used for the promotion of the synthesis of 1,8-dioxoxanthene derivatives. The main advantage for using this catalyst are ease of separation of the catalyst, highyields of achived products during low reaction times.