Chitosan-silica Sulfate Nano Hybrid: An Efficient Biopolymer Based-heterogeneous Nano Catalyst for Solvent-free Synthesis of 3,4-Dihydropyrimidine-2(1H)-one/thiones

Gazunfor Ali, 1 Nisar A Dangroo, 1,2,* Shabnam Raheem, 2 Tahira Naqvi, 3 Tabassum Ara, 1 Masood Ahmad Rizvi, 2,*.. 1 Department of Chemistry, National Institute of

Faculty of Chemistry and Chemical Technology, University of Ljubljana (retired) Večna pot 113, 1000 Ljubljana, Slovenia. *Corresponding author:

1 Department of Organic Chemistry, Faculty of Chemistry and Chemical Technology, Večna pot 113, 1000 Ljubljana, Slovenia.. 2 Present address:

1 Department of Organic Chemistry, Faculty of Chemistry and Chemical Technology, Večna pot 113, 1000 Ljubljana, Slovenia. 2 Present address:

a Department of Chemistry, Malaviya National Institute of Technology, Jawaharlal Nehru Marg, Jaipur- 302017, India.. b Department of Biochemistry, All India Institute of

4 Department of Nanotechnology and Advance Materials, Materials and Energy Research Center, Karaj, Alborz, Iran.. *Corresponding author: Tel: 00989372059283;

Thus, in this research we have introduced a novel nano-sized Rb 2 HPW 12 O 40 of the Keggin series which is stable and efficient heterogeneous catalyst in organic synthesis, for

A novel multiwalled carbon nanotube catalyst with –SO 3 H functional groups was easily prepared from its starting ma- terials and used as an efficient heterogeneous catalyst for