Preparation and characterization of chiral oxazaborolidine complex immobilized SBA-15 and its application in the asymmetric reduction of prochiral ketones
Date
2010
Authors
Balakrishnan, U.
Ananthi, N.
Selvan, S.T.
Pal, R.
Ariga, K.
Velmathi, S.
Vinu, A.
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Journal article
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Chemistry - An Asian Journal, 2010; 5(4):897-903
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Abstract
The immobilization of chiral oxazaborolidine complex in the wellordered mesochannels of SBA-15 is demonstrated by a postsynthetic approach using 3-aminopropyltriethoxysilane as a reactive surface modifier. The immobilized catalysts are characterized by various techniques, such as XRD, nitrogen adsorption, HRSEM, UV/Vis diffuse reflectance spectroscopy, and FTIR spectroscopy. The catalysts are used for the enantioselective reduction of aromatic prochiral ketones. The activity of the chiral oxazaborolidine complex immobilized SBA-15 catalysts is also compared with that of the pure chiral oxazaborolidine complex, which is a homogeneous catalyst. It is found that the activity of the chiral complex immobilized SBA-15 heterogeneous catalyst is comparable with that of the homogeneous catalyst.
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Copyright 2010 Wiley-VCH Verlag GmbH & Co.