Abstract
MCM-41 samples containing Ce 4+ and Al 3+ in the network, designated as Ce x –Al–MCM-41 ( x = 0.0–0.04), were synthesized and characterized systematically. These samples exhibited higher catalytic activity for Mukaiyama-aldol condensations to produce β-hydroxy carbonyl compounds under the solvent free conditions, compared to the samples containing either of the two cations. The product yield was found to depend on the electron donating/withdrawing characteristics of reactant molecules being responsible for the observed trend. Series of solvents were also investigated but considerably high yield of aldol products (∼95%) could be achieved without using any solvents. In all the cases, the selectivity was found to be 100%, typical of such Mukaiyama-aldol condensations. The higher catalytic activity of Ce x –Al–MCM-41 is explained on the basis of certain new acid sites generated due to co-incorporation of Ce and Al cations.
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