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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.51A [2012] >
IJC-A Vol.51A(09-10) [September-October 2012] >
| Title: | Chitosan biohydrogel beads: A recyclable, biodegradable, heterogeneous catalyst for the regioselective synthesis of 5-aryl-2-oxazolidinones from carbon dioxide and aziridines at mild conditions |
| Authors: | Watile, Rahul A
Bhanage, Bhalchandra M |
| Keywords: | Catalysts
Heterogeneous catalysts
Aziridines
5-Aryl-2-oxazolidinones
Carbon dioxide
Chitosan biohydrogel beads |
| Issue Date: | Sep-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | In the search for efficient catalysts for a reaction
under mild conditions, cycloaddition reactions of carbon dioxide with various
aziridines catalyzed by chitosan biohydrogel beads without additional solvent
and metal co-catalyst to form
five-membered 5-aryl-2-oxazolidinones in high yields and selectivity has been
studied. Reaction rate, conversion and selectivity are studied as a function of
a series of input variables including catalyst loading, temperature, pressure
and solvent system. The catalyst is easily recovered and has been reused in
five consecutive cycles without any significant loss of its catalytic activity
and selectivity. The catalyst, chitosan biohydrogel beads, has been
characterized by a variety of techniques, namely, scanning electron microscopy and Fourier transform infrared
spectroscopy. A plausible reaction mechanism
for the hydrogen-bond assisted ring-opening of aziridine to five-membered
5-aryl-2-oxazolidinones is also proposed.
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| Page(s): | 1354-1360 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.51A(09-10) [September-October 2012]
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