02068nas a2200253   4500008004100000022001400041245006600055210006600121260009500187300001200282490000800294520115700302653004301459653002401502653002901526653005201555653001601607653001401623100001901637700002201656700002101678700001801699856009701717       2007                        eng d  a0021-951700aActivation and reactivity of epoxides on solid acid catalysts0 aActivation and reactivity of epoxides on solid acid catalysts  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcDEC  a148-1600 v2523 a<p>The aminolysis of epoxides over novel solid catalysts (Bronsted-acidic SBA-15 functionalized with propylsulfonic acid and Lewis-acidic Ti-MCM-41) is reported. The acidic properties of these catalysts were determined by FTIR spectroscopy and temperature-programmed desorption of pyridine and NH3, respectively. The mesoporous solid acids of the present study are reusable and exhibit significantly higher catalytic activities than known catalysts for opening of the oxirane ring with nitrogen (aromatic and aliphatic amines)-containing and oxygen (alcohols)-containing nucleophiles. A range of beta-amino, alcohols with high regioselectivity and stereoselectivity were synthesized. Adsorption studies as well as the sigmoid shape of the conversion- versus-time plots show that the epoxide and amine compete for adsorption on the acidic sites (-SO3H or Ti4+) on the catalyst surface. Epoxide adsorption and activation on acid sites are the more critical processes. Catalytic activity decreases with increasing basicity of the amines and/or the alcohol, as well as the dielectric constant of the solvent. (C) 2007 Elsevier Inc. All rights reserved.</p>10aaminolysis and alcoholysis of epoxides10abeta-Amino alcohols10aring opening of epoxides10aSBA-15 functionalized with propylsulfortic acid10aSolid acids10aTi-MCM-411 aSaikia, Lakshi1 aSatyarthi, J., K.1 aSrinivas, Darbha1 aRatnasamy, P.  uhttps://library.ncl.res.in/content/activation-and-reactivity-epoxides-solid-acid-catalysts-0