01755nas a2200217   4500008004100000022001400041245013600055210006900191260007300260300001200333490000800345520092800353653001401281653002201295653001901317653001601336100001901352700002401371700001801395856012401413       2010                        eng d  a0926-860X00aNature of the acid sites in the metal triflates immobilized in SBA-15 and their role in the friedel-crafts acylation of naphthalene0 aNature of the acid sites in the metal triflates immobilized in S  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN  a130-1370 v3723 a<p>The Zn-triflate molecules loaded (5-30 mol%) in mesoporous SBA-15 silicate exhibited considerably higher catalytic activity for liquid-phase Friedel-Crafts (FC) acylation of naphthalene with p-toluoyl chloride, as compared to the corresponding triflates of La, Ce and Y. In situ FTIR studies revealed that the triflate molecules occluded in the channels of SBA-15 may cause severe perturbation of surface hydroxyl groups, without undergoing an electronic binding. The metal cations of the triflate molecules, on the other hand, participated in direct bonding of the reactant molecules and also helped in the formation of some Bronsted type surface acid sites. This article discusses the role of the acid sites generated on occlusion of metal triflates in SBA-15, as monitored by using NH(3)-TPD and pyridine-IR spectroscopy, in the Friedel-Crafts acylation of naphthalene. (C) 2009 Elsevier B.V. All rights reserved.</p>10aAcylation10aMesoporous silica10aMetal triflate10aNaphthalene1 aSelvakumar, S.1 aGupta, Narendra, M.1 aSingh, A., P.  uhttps://library.ncl.res.in/content/nature-acid-sites-metal-triflates-immobilized-sba-15-and-their-role-friedel-crafts-0