02420nas a2200289   4500008004100000022001400041245011000055210006900165260007700234300001400311490000600325520138300331653002101714653001901735653002501754653001801779100002801797700003501825700002101860700001901881700001701900700001901917700002401936700002801960700001701988856012502005       2014                        eng d  a1867-388000aTitania nanoparticles stabilized HPA in SBA-15 for the intermolecular hydroamination of activated olefins0 aTitania nanoparticles stabilized HPA in SBA15 for the intermolec  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcDEC  a3347-33540 v63 a<p>A liquid phase hydroamination (HA) of alpha,beta-ethylenic compounds with amines was investigated with TiO2 nanoparticles stabilized 12-tungstophosphoric acid (TPA) in SBA-15. The catalysts were prepared by wet impregnation of TPA/TiO2 nanoparticles into the SBA-15 and calcined at different temperatures. The characterization results reveal that the textural properties and the acidity of the prepared catalysts can be finely controlled with the simple adjustment of the calcination temperature and the structure of the support, decorated with the TiO2 and TPA nanoparticles, was intact even after the modification. The prepared catalysts were investigated for HA of ethyl acrylate with different aromatic and aliphatic amines over a wide range of reaction conditions to optimize the yield and the selectivity of product. It was found that this process is 100% atom efficient and the catalytic performance depended significantly on the loading of TPA over the catalyst and the calcination temperature. Under optimized reaction conditions, the best catalyst, 15 wt% TPA/22.4 wt% TiO2/SBA-15 calcined at 1123 K, offered the highest conversion of p-ethylaniline (70%) with 100% chemo-selectivity to the anti-Markovnikov product, i.e., the mono-addition product. The reaction was heterogeneously catalyzed and no contribution from leached TPA into the reaction was observed.</p>10aheteropoly acids10ahydroamination10amesoporous materials10ananocatalysts1 aSawant-Dhuri, Dhanashri1 aBalasubramanian, Veerappan, V.1 aAriga, Katsuhiko1 aPark, Dae-Hwan1 aChoy, Jin-Ho1 aCha, Wang, Soo1 aAl-deyab, Salem, S.1 aHalligudi, Shivappa, B.1 aVinu, Ajayan  uhttps://library.ncl.res.in/content/titania-nanoparticles-stabilized-hpa-sba-15-intermolecular-hydroamination-activated-0