an efficient and green method for the synthesis of pyrano[3,2-c]chromene or pyrano[4,3-b]pyrone derivatives is described by using a three-component condensation process of malononitrile, aldehyde, and 4-hydroxycoumarine or 4-hydroxypyrone in [bmim]bf4-licl as an ionic liquid.

pure azo schiff bases were readily and conveniently accessible in high yields by mixing of the reagents either as aqueous slurry, or by grinding at room temperature. this method, unlike a classical method, needs neither harsh conditions nor organic solvents. the satisfactory results were obtained with excellent yields, short reaction time, and operational simplicity in the experimental procedur...

context: in recent years, nanotechnology has opened up several new avenues of extraordinary biomedical potential by modulating metals into their nanosize leading to significant improvement in their chemical, physical and optical properties. introduction: the advanced fabrication techniques have been exploited to modify nanostructured materials. the functionalized nanoscaled fibers display vario...

Maryam Mashhadinezhad was born in Rasht, Guilan, I. R. Iran. She received her B. Sc in chemistry in 2009 from the University of Guilan and her M.Sc. in organic chemistry in 2011 from the same University. She is studying under the supervision of Dr. Farhad Shirini for her Ph. D. Her research interests include the use of heterogeneous catalysts in organic reactions.

meysam yarie was born in 1987 in malayer, hamedan, iran. he received his b.sc. in applied chemistry (2010) from malek-ashtar university of technology and m.sc. in organic chemistry (2012) from kurdistan university under the supervision of dr. kamal amani. he is currently working towards his ph.d. under the supervision of professor mohammad ali zolfigol. his research interest is catalysis, inclu...

Maryam Mashhadinezhad was born in Rasht, Guilan, I. R. Iran. She received her B. Sc in chemistry in 2009 from the University of Guilan and her M.Sc. in organic chemistry in 2011 from the same University. She is studying under the supervision of Dr. Farhad Shirini for her Ph. D. Her research interests include the use of heterogeneous catalysts in organic reactions.

Ehsan Noroozizadeh was born in Dezful/Khoozestan, Iran. He received his B.S. in Pure Chemistry (2011) and M.S. in Organic Chemistry (2013) from Bu-Ali Sina University, Iran. He is currently working towards his Ph.D. under the supervision of Professor Mohammad Ali Zolfigol. His research interest is catalysis, including the application of homogeneous and heterogeneous catalysis in organic synthesis.