<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Saikia, Lakshi</style></author><author><style face="normal" font="default" size="100%">Satyarthi, J. K.</style></author><author><style face="normal" font="default" size="100%">Srinivas, Darbha</style></author><author><style face="normal" font="default" size="100%">Ratnasamy, P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Activation and reactivity of epoxides on solid acid catalysts</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Catalysis</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">aminolysis and alcoholysis of epoxides</style></keyword><keyword><style  face="normal" font="default" size="100%">beta-Amino alcohols</style></keyword><keyword><style  face="normal" font="default" size="100%">ring opening of epoxides</style></keyword><keyword><style  face="normal" font="default" size="100%">SBA-15 functionalized with propylsulfortic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Solid acids</style></keyword><keyword><style  face="normal" font="default" size="100%">Ti-MCM-41</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">DEC</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">2</style></number><publisher><style face="normal" font="default" size="100%">ACADEMIC PRESS INC ELSEVIER SCIENCE</style></publisher><pub-location><style face="normal" font="default" size="100%">525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA</style></pub-location><volume><style face="normal" font="default" size="100%">252</style></volume><pages><style face="normal" font="default" size="100%">148-160</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;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.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">&lt;p&gt;Foreign&lt;/p&gt;</style></custom3><custom4><style face="normal" font="default" size="100%">7.354</style></custom4></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Srinivas, Darbha</style></author><author><style face="normal" font="default" size="100%">Hoelderich, Wolfgang F.</style></author><author><style face="normal" font="default" size="100%">Kujath, Steffen</style></author><author><style face="normal" font="default" size="100%">Valkenberg, Michael H.</style></author><author><style face="normal" font="default" size="100%">Raja, Thirumalaiswamy</style></author><author><style face="normal" font="default" size="100%">Saikia, Lakshi</style></author><author><style face="normal" font="default" size="100%">Hinze, Ramona</style></author><author><style face="normal" font="default" size="100%">Ramaswamy, Veda</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Active sites in vanadia/titania catalysts for selective aerial oxidation of beta-picoline to nicotinic acid</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Catalysis</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Active vanadium species</style></keyword><keyword><style  face="normal" font="default" size="100%">Nicotinic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Oxidation of beta-picoline</style></keyword><keyword><style  face="normal" font="default" size="100%">Selective aerial oxidation</style></keyword><keyword><style  face="normal" font="default" size="100%">Spectroscopic investigations</style></keyword><keyword><style  face="normal" font="default" size="100%">Vanadia/titania</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2008</style></year><pub-dates><date><style  face="normal" font="default" size="100%">OCT</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">2</style></number><publisher><style face="normal" font="default" size="100%">ACADEMIC PRESS INC ELSEVIER SCIENCE</style></publisher><pub-location><style face="normal" font="default" size="100%">525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA</style></pub-location><volume><style face="normal" font="default" size="100%">259</style></volume><pages><style face="normal" font="default" size="100%">165-173</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Vanadia/titania catalysts with varying vanadium content were prepared by impregnation using three different titania carrier materials of varying surface area, The structure of active vanadium species for beta-picoline oxidation was investigated. Vanadium is mainly in the +5 oxidation state as revealed by electron paramagnetic resonance (EPR) and V-51 magic-angle spinning nuclear magnetic resonance (V-51 MAS NMR) spectroscopy techniques. Diffuse reflectance UV-visible (DRUV-vis) spectroscopy and spectral deconvolution enabled identification of at least five different types of vanadium oxide species in these catalysts: monomeric tetrahedral VO43-, polymeric distorted tetrahedral VO3-, square pyramidal V2O5, octahedral V2O62- and V4+ oxide species. While both VO43- and VO3- species are active in beta-picoline oxidation, the latter having a distorted tetrahedral geometry yielded the desired products-picolinaldehyde and nicotinic acid. High surface area, anatase structure for the support and dispersed, distorted tetrahedral vanadium oxide species are the key parameters determining the activity and selectivity of these oxidation catalysts. (C) 2008 Elsevier Inc. All rights reserved.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">Foreign</style></custom3><custom4><style face="normal" font="default" size="100%">7.354</style></custom4></record></records></xml>