Catalysis by an ionic liquid: Highly efficient solvent-free synthesis of aryl-14H-dibenzo[a.j]xanthenes by molten tetrabutylammonium bromide under conventional and microwave heating

Tetra-n-butylammonium bromide (TBAB) in molten state has been found to be highly efficient and recyclable catalyst for the synthesis of aryl-14H-dibenzo[a.j]xanthenes under solvent-free conventional and microwave heating in excellent yields.