01786nas a2200217   4500008004100000022001400041245009300055210006900148260007300217300001000290490000800300520097900308653001801287653001701305653003401322653002401356100002001380700002401400700001701424856012701441       2011                        eng d  a1387-181100aSolvent-free mukaiyama-aldol condensation catalyzed by Ce-Al-MCM-41 mesoporous materials0 aSolventfree mukaiyamaaldol condensation catalyzed by CeAlMCM41 m  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a82-900 v1443 a<p>MCM-41 samples containing Ce4+ and Al3+ 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 beta-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 (similar to 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. Published by Elsevier Inc.</p>10aAcid catalyst10aCe-Al-MCM-4110aSilyl enol ether and aldehyde10aSilyl ketene acetal1 aKalita, Pranjal1 aGupta, Narendra, M.1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/solvent-free-mukaiyama-aldol-condensation-catalyzed-ce-al-mcm-41-mesoporous-materials-0