a new approach for the synthesis of 3,4-dihydropyrano[c]chromenes and biscoumarins using {[2,2’-bpyh][c(cn)3]2} as a bifunctional nanostructured ionic liquid catalyst

[2,2’-bipyridine]-1,1’-diium tricyanomethanide {[2,2’-bpyh][c(cn)3]2} as a bifunctional nanostructured ionic liquid catalyst (0.5 mol%) was used for the synthesis of 3,4-dihydropyrano[c]chromenes (14 examples) under solvent-free condition at room temperature in high yield (82-91%) and short reaction time. in addition, the described ionic liquid catalyst was also applied for the synthesis of biscoumarins (8 examples) under the same reaction condition in good yield (87-91%) and short reaction time. the {[2,2’-bpyh][c(cn)3]2} as a catalyst was attained by the reaction of 2,2’-bipyridine (5 mmol) and 5 ml of an aqueous solution of tricyanomethane (5 mmol) at room temperature for 3 hours. the {[2,2’-bpyh][c(cn)3]2} as a catalyst was obtained with high purity approved by ftir, 1h nmr, 13c nmr, mass, tg, dta, xrd, sem, tem analyses and melting-point determination. the catalyst was recovered in excellent yield and was used in the revealed reaction 5 times without the need of additional catalyst. the major advantages of the presented procedure are efficient catalysis and good cost efficiency.