Dhar, Dwairath and Beadham, Ian and Chandrasekaran, Srinivasan (2003) Proline and benzylpenicillin derivatives grafted into mesoporous MCM-41: Novel organic–inorganic hybrid catalysts for direct aldol reaction. In: Journal of Chemical Sciences, 115 (5-6). pp. 365-372.
![]()
|
PDF
Proline_and_benzylpenicillin.pdf Download (181kB) |
Abstract
New organic–inorganic hybrid catalysts were synthesized by covalent grafting of proline and benzylpenicillin derivatives into mesoporous MCM-41. These catalysts were extensively characterized using FT-IR, $^{13}CCP MAS$ solid state NMR, XRD and TEM techniques. These were used as catalysts for direct, asymmetric aldol reaction between acetone and activated aromatic aldehydes. In the reaction of 4-nitro and 4-fluoro benzaldehyde, the aldol products were obtained in 36% and 59% ee respectively. The catalysts were reusable with neither significant drop in enantioselectivity nor loss of mesostructure. An attempt was made to substantiate the proposed ‘enamine’ mechanism for direct aldol reaction by trapping the intermediate between proline-MCM-41 and acetone.
Item Type: | Journal Article |
---|---|
Publication: | Journal of Chemical Sciences |
Publisher: | Indian Academy of Sciences |
Additional Information: | The Copyright belongs to Indian Academy of Sciences. |
Keywords: | Proline;MCM-41;Hybrid catalysts;Grafting;Aldol reaction;Enamine |
Department/Centre: | Division of Chemical Sciences > Organic Chemistry |
Date Deposited: | 13 Apr 2006 |
Last Modified: | 19 Sep 2010 04:25 |
URI: | http://eprints.iisc.ac.in/id/eprint/6267 |
Actions (login required)
![]() |
View Item |