شماره ركورد كنفرانس :
5536
عنوان مقاله :
Various co-polymers of MBA-poly(N-vinyl-2-pyrrolidone) macromolecular coordination complex as a novel and recyclable Lewis acid catalyst: synthesis, characterization, and performance towards well-know organic reaction
پديدآورندگان :
mirkani Ahmad Polymer Chemistry Research Laboratory, Shahid Beheshti University , Sajjadinezhad Seyed Mehrzad Polymer Chemistry Research Laboratory, Shahid Beheshti University , alijani Naser Polymer Chemistry Research Laboratory, Shahid Beheshti University , Rahmatpour Ali Polymer Chemistry Research Laboratory, Shahid Beheshti University
كليدواژه :
Polymer Synthesis and Polymerization , Polymer , supported catalysts , reusable catalyst , poly(N , vinyl , 2 , pyrrolidone)
عنوان كنفرانس :
پانزدهمين همايش بين المللي علوم و فناوري پليمر
چكيده فارسي :
A novel macromolecular-metal coordination complex, MBA-cross-linked PNVP/Lewis acid material was fabricated by Ferric chloride/Titanium chloride/Zirconium chloride onto the porous cross-linked poly(N-vinyl-2-pyrrolidone) carrier beads as a macromolecular ligand or carrier which was prepared by suspension free-radical copolymerization of N-vinyl-2-pyrrolidone (NVP) and various percent of N, N’-methylene bis-acrylamide (MBA) as a crosslinking agent in water. The obtained MBA-cross-linked PNVP/Lewis acid w:as char:acterized by UV/vis and FT-IR spectroscopies, TGA, FE-SEM, EDX, and ICP techniques. Comparison to select the optimum percentage of a crosslinking agent as the purpose of this study and the amount of Lewis acids loading has been done by a EDX , ICP, and Mohr titration method. This heterogenized version of ferric chloride/Titanium chloride/Zirconium chloride is a convenient and safe alternative to highly water intolerant proportion of homogeneous the same lewis acid. The catalytic performance of PNVP/(FeCl3, TiCl4, ZrCl4) as an efficient and recyclable polymeric Lewis acid catalyst was appropriately probed in the regio-and stereoselective nucleophilic ring-opening of various epoxides with various alcohols in excellent yields without generating any waste and the Biginelli reaction. The experimental outcome revealed that using the copolymer beads as carriers with a high percentage of crosslinking and the high mesh size leads had an adverse effect on the reaction rate, the optimum crosslinking agent is 4% of MBA with 4.38 mmol/gr, 5.09 mmol/gr and 0.53 mmol/gr for FeCl3, TiCl4, ZrCl4, respectively. Also data shows that heterogeneous catalyst is very active and could be easily recovered, and reused at least 6 times without appreciable loss of activity indicating its stability under experimental conditions.
