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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.
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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