02106nas a2200253   4500008004100000022001400041245019400055210006900249260007300318300001200391490000800403520111100411653002601522653002201548653001701570653001401587100001601601700002501617700002101642700002401663700001901687700001801706856012801724       2009                        eng d  a1381-116900aCatalytic meerwein-ponndorf-verley reductions over mesoporous silica supports: rational design of hydrophobic mesoporous silica for enhanced stability of aluminum doped mesoporous catalysts0 aCatalytic meerweinponndorfverley reductions over mesoporous sili  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a118-1260 v3013 a<p>A series of aluminum isopropoxide-grafted mesoporous organosilica having ethane (-CH(2)-CH(2)-) and ethene (-CH=CH-) groups in the frame wall positions (ethane-silica, ethene-silica) as well as mesoporous silicas (MCM-41, MCM-48. SBA-15) through siloxide linkages were fabricated. The samples were used as catalysts in the Meerwein-Ponndorf-Verley reduction of ketones and aldehydes of different nature and size using secondary alcohols as the hydrogen transfer agents. Aluminum isopropoxide supported mesoporous silica samples show higher catalytic conversion and among them, the one-dimensionally channel oriented Si-MCM-41 supported aluminum isopropoxide shows better results than the three-dimensional Si-MCM-48 and the large pore Si-SBA-15. Compared to aluminum isopropoxide-grafted mesoporous silica samples, aluminum alkoxide-grafted organosilica samples shows better catalytic activity even in the presence of 10% of water and the better stability is attributed to the presence of integrated hydrophobic organic groups in the frame wall positions. (C) 2008 Elsevier B.V. All rights reserved.</p>10aAluminum isopropoxide10aMesoporous silica10aOrganosilica10areduction1 aShylesh, S.1 aKapoor, Mahendra, P.1 aJuneja, Lekh, R.1 aSamuel, Prinson, R.1 aSrilakshmi, Ch1 aSingh, A., R.  uhttps://library.ncl.res.in/content/catalytic-meerwein-ponndorf-verley-reductions-over-mesoporous-silica-supports-rational-0