02033nas a2200253   4500008004100000022001400041245009700055210006900152260007300221300001200294490000800306520115300314653001201467653001301479653002701492653002501519653001101544100001301555700002201568700002801590700001701618700002101635856012301656       2005                        eng d  a0926-860X00aHighly active and selective AlSBA-15 catalysts for the vapor phase tert-butylation of phenol0 aHighly active and selective AlSBA15 catalysts for the vapor phas  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a207-2130 v2813 a<p>Hexagonally ordered mesoporous AISBA-15 catalysts having n(Si)/(nA]) ratios from 7 to 215 have been synthesized hydrothermally using a cheap non-ionic block copolymer as the structure-directing agent. The obtained materials were analyzed by XRD and nitrogen adsorption to determine the structural order and the textural properties. It has been observed by Al-27 MAS NMR spectroscopy that aluminum atoms are exclusively in tetrahedral coordination for all samples except AISBA-15(7), where octahedral aluminum has been detected to some extent. Temperature-programmed desorption of pyridine showed that AISBA-15(45) has a higher number of strong acid sites as compared to other mesoporous materials such as FeMCM-41, AIMCM-41 and FcAlMCM-41. The catalyst AlSBA-15(45)showed superior performance in the acid-catalyzed tertiary butylation of phenol employing tert-butanol as the alkylation agent. A high phenol conversion of 86.3% is observed for this catalyst at a reaction temperature of 150 degrees C. Over AISBA-15(45), the 4-TBP yield amounts to 40.5% and the 2,4-DTBP yield corresponds to 37.9%. (c) 2004 Elsevier B.V. All rights reserved.</p>10aAcidity10aAlSBA-1510aaluminum incorporation10abutylation of phenol10aSBA-151 aVinu, A.1 aDevassy, Biju, M.1 aHalligudi, Shivaraj, B.1 aBohlmann, W.1 aHartmann, Martin  uhttps://library.ncl.res.in/content/highly-active-and-selective-alsba-15-catalysts-vapor-phase-tert-butylation-phenol-002095nas a2200289   4500008004100000022001400041245016000055210006900215260007300284300001000357490000800367520107900375653001301454653002101467653001301488653001301501653001301514653001001527653002001537653001301557653001901570653001501589100002701604700001901631700002801650856012701678       2008                        eng d  a1381-116900aChemoselective synthesis of beta-amino acid derivatives by hydroamination of activated olefins using AISBA-15 catalyst prepared by post-synthetic treatment0 aChemoselective synthesis of betaamino acid derivatives by hydroa  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a16-230 v2843 a<p>beta-Amino acid derivatives have a wide variety of applications viz. in the synthesis of peptide analogues, precursor for amino alcohols, optically active amino acids, lactums and diamines. Chemoselective anti-Markovnikov hydroamination reaction of activated olefins was effectively used to synthesize beta-amino acid derivatives using AlSBA-15 and AlMCM-41 catalysts. These catalysts with different Si/Al ratios were synthesized by isomorphous substitution of aluminium into the framework of SBA-15, which induces the Bronsted and Lewis acid sites. The structural integrity of the catalysts was established by characterizing with XRD, N-2-sorption, TEM, NH3-TPD Al-27 MAS NMR and Si-29 MAS NMR techniques. Hydroamination of ethyl acrylate with aniline was used as a test reaction, which gave N-[2-(ethoxycarbonyl)ethyl] aniline with high selectivity. The performance of AlSBA-15 catalyst was also determined with different acrylates and amines to know the general applicability of the catalyst in hydroamination reactions. (C) 2008 Elsevier B.V. All rights reserved.</p>10aacrylate10aactivated olefin10aaddition10aAlMCM-4110aAlSBA-1510aAmine10abeta-amino acid10aCatalyst10ahydroamination10aMesoporous1 aShanbhag, Ganapati, V.1 aKumbar, S., M.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/chemoselective-synthesis-beta-amino-acid-derivatives-hydroamination-activated-olefins-0