02201nas a2200265   4500008004100000022001400041245010700055210006900162260009500231300001000326490000600336520126700342653001701609653001201626653001101638653000901649653002301658653001801681100001701699700002501716700002601741700001701767700001901784856013201803       2005                        eng d  a1550-703300aExtra-/intracellular biosynthesis of gold nanoparticles by an alkalotolerant fungus, trichothecium sp.0 aExtraintracellular biosynthesis of gold nanoparticles by an alka  a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScMAR  a47-530 v13 a<p>The development of reliable, eco-friendly processes for the synthesis of nanoscale materials is an important aspect of nanotechnology. As part of our ongoing investigation into the use of fungi for nanoparticle synthesis, we report herein that depending on the reaction conditions of the fungus Trichothecium sp. with aqueous gold ions, gold nanoparticle synthesis can be controlled to occur either within the biomass or extracellularly. Moreover, we have found that reaction of gold ions with the Trichothecium sp. fungal biomass under stationary conditions results in the rapid extracellular formation of gold nanoparticles of spherical, rod-like and triangular morphology whereas reaction of the biomass under shaking conditions resulted in intracellular growth of the nanoparticles. It is believed that on changing the reaction conditions of the fungus with gold ions, the enzymes and proteins which are being released into the medium under stationary conditions do not get released under shaking conditions resulting in the formation of extracellular or intracellular gold nanoparticles respectively. The gold nanoparticles are not toxic to the cells and the cells continued to grow after the biosynthesis of the gold nanoparticles in both the cases.</p>10aBiosynthesis10aenzymes10aFungus10aGold10aMorphology Control10aNanoparticles1 aAhmad, Absar1 aSenapati, Satyajyoti1 aKhan, Mohammad, Islam1 aKumar, Rajiv1 aSastry, Murali  uhttps://library.ncl.res.in/content/extra-intracellular-biosynthesis-gold-nanoparticles-alkalotolerant-fungus-trichothecium-sp-001377nas a2200217   4500008004100000020002200041022001400063245007100077210006600148260009900214300001400313490000800327520064200335100002000977700001700997700001001014700001201024700001201036700001101048856010001059       2007                        eng d  a978-0-444-53068-4  a0167-299100aCe-Al-MCM-41: an efficient catalyst for Mukaiyama-Michael reaction0 aCeAlMCM41 an efficient catalyst for MukaiyamaMichael reaction  aSara Burgerhartstraat 25, Po Box 211, 1000 AE Amsterdam, NetherlandsbElsevier Science BVcAUG  a1161-11660 v1703 a<p>The activity of cerium containing Al-MCM-41 mesoporous materials has been studied for carbon-carbon bond formation reaction like Mukaiyama-Michael reaction under mild liquid phase conditions. The catalysts were synthesized by hydrothermal method at 383 K for 24-36 h in Teflon-lined autoclave and characterized thoroughly by XRD, UV-VIS, TEM, EPR, XPS, (27)Al NMR, NH(3)-TPD, pyridine-IR and AAS in order to obtain well-ordered M41S type materials. The Mukiayama-Michael reactions between silyl enol ether and alpha,beta-unsaturated ketones give Michael product in very good yields (100% selectivity). The catalysts were reusable.</p>1 aKalita, Pranjal1 aKumar, Rajiv1 aXu, R1 aGao, Z.1 aChen, J1 aYan, W  uhttps://library.ncl.res.in/content/ce-al-mcm-41-efficient-catalyst-mukaiyama-michael-reaction-002135nas a2200169   4500008004100000022001400041245016200055210006900217260007100286300001400357490000700371520140700378100001801785700001801803700001701821856012701838       2007                        eng d  a0888-588500aEco-friendly, selective hydroxylation of C-7 aromatic compounds catalyzed by TS-1/H2O2 system under solvent-free solid-liquid-liquid-type triphase conditions0 aEcofriendly selective hydroxylation of C7 aromatic compounds cat  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcDEC  a8657-86640 v463 a<p>Direct ring hydroxylation of aromatics, namely, anisole, toluene, and benzylchloride, using TS-1 catalyst, a MFI-type titanium silicate molecular sieve, dilute H2O2 as oxidizing agent, and water as reaction medium, was investigated under solid-liquid-liquid (SLL)-type triphase conditions. The aim was to study the relative influence of commonly used organic solvents, under solid-liquid (SL)-type biphase reaction conditions, as compared to that of water, on the conversion and product selectivity. Under solvent-free triphase conditions, the ring hydroxylation of anisole, toluene, and benzylchloride leads to significant enhancement in the conversion, turn-over frequency, and para-selectivity. However, in the case of benzyl chloride, no ring hydroxylation took place under biphase conditions (using acetone as solvent) contrary to significant ring hydroxylation (ca. 60% H2O2 efficiency) under triphase aqueous medium conditions. The simple product recovery (phase separation of organic and aqueous layers) and use of water as reaction medium are other advantages. Since TS-1 is relatively hydrophobic, the reaction is hindered in the presence of organic solvents as they compete favorably with the substrate for diffusion inside the TS-1 channels. However, in the presence of water, the organic substrate competes favorably with water, leading to increased conversion and para-selectivity.</p>1 aMukherjee, P.1 aBhaumik, Asim1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/eco-friendly-selective-hydroxylation-c-7-aromatic-compounds-catalyzed-ts-1h2o2-system-001212nas a2200229   4500008004100000022001400041245012200055210006900177260007300246300001200319490000600331520034600337653001900683653002000702653001600722653002800738653001600766653002600782100002600808700001700834856013100851       2007                        eng d  a1566-736700aEco-friendly synthesis of epichlorohydrin catalyzed by titanium silicate (TS-1) molecular sieve and hydrogen peroxide0 aEcofriendly synthesis of epichlorohydrin catalyzed by titanium s  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a379-3820 v83 a<p>In a mixed solvent system of acetonitrile and methanol, titanium silicate molecular sieve, TS-1, having MFI topology, efficiently catalyses the epoxidation of allyl chloride to the corresponding epichlorohydrin in excellent yields using dilute hydrogen peroxide (45%) as an oxidizing agent. (c) 2006 Elsevier B.V. All rights reserved.</p>10aallyl chloride10aepichlorohydrin10aepoxidation10aheterogeneous catalysis10aselectivity10atitanium silicalite-11 aPandey, Rajesh, Kumar1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/eco-friendly-synthesis-epichlorohydrin-catalyzed-titanium-silicate-ts-1-molecular-sieve-and01985nas a2200277   4500008004100000022001400041245011000055210006900165260007400234300001200308490000800320520103100328653001601359653001101375653001301386653002401399653001401423653001701437100002701454700002401481700002001505700002501525700002001550700001701570856012001587       2007                        eng d  a1520-610600aNCL-7, a novel all silica analog of polymorph B rich member of BEA family: synthesis and characterization0 aNCL7 a novel all silica analog of polymorph B rich member of BEA  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbJapan Assoc ZeolitescAPR  a108-1140 v1013 a<p>{Polymorph B-rich BEA type structure, NCL-7, was synthesized using hydrothermal method in fluoride medium using perchloric acid as promoter. The samples were characterized using XRD, low temperature N-2-adsorption and Si-29 MASNMR. As the structure of beta is highly disordered Rietveld refinement of powder XRD patterns is precluded. Phase composition is derived using the simulated patterns for the random intergrowths of polymorph A and B by DIFFaX. The stacking direction c' is perpendicular to the a'b' plane of the layer. The composition of polymorph B is found to be ca. 60-65%. Two other structures namely NCL-5 and NCL-6 with varying degree of polymorph B enrichment were also synthesized. Synthesis parameters such as effect of H2O/SiO2, TEAOH/SiO2, HClO4/SiO2 and crystallization temperature were studied thoroughly. The present article explains for the first time the synthesis and characterization of NCL-7, an analog of BEA type family with enrichment of polymorph B and its comparison with normal beta (*</p>10aB-polymorph10aDIFFaX10aPromoter10aReitveld refinement10asynthesis10azeolite beta1 aKadgaonkar, Mahesh, D.1 aKasture, Mahesh, W.1 aBhange, Deu, S.1 aJoshi, Praphulla, N.1 aRamaswamy, Veda1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/ncl-7-novel-all-silica-analog-polymorph-b-rich-member-bea-family-synthesis-and-001919nas a2200229   4500008004100000022001400041245015400055210006900209260009500278300001200373490000800385520100700393653001601400653002501416653001701441653003001458653001801488100002001506700002401526700001701550856012201567       2007                        eng d  a0021-951700aSynergistic role of acid sites in the Ce-enhanced activity of mesoporous Ce-Al-MCM-41 catalysts in alkylation reactions: FTIR and TPD-ammonia studies0 aSynergistic role of acid sites in the Ceenhanced activity of mes  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcJAN  a338-3470 v2453 a<p>The acidic properties of Ce-x-Al-y-MCM-41 with different Ce/Al/Si atomic ratios were examined by pyridine-FTIR and ammonia-TPD methods. Both the density and the strength of the acid sites were considerably higher in the samples containing both Ce and Al than in the samples with only one of these substituents. The IR spectra of chemisorbed pyridine revealed that the Ce-Al-MCM-41 samples contained at least two distinct Lewis acid sites, L-2 (1595-1444 cm(-1)) and L-1 (1613-1452 cm(-1)), where the L-2/L-1 ratio increased progressively with increasing Ce/Al atomic ratio in a series of samples with similar Si/Al ratios. In addition, the density of the Bronsted acid sites (B) as well as the B/L-1 ratio increased with increasing Ce/Al molar ratio in these samples. The findings of this study help us understand the synergistic role played by Lewis and Bronsted acid sites in the catalytic activity of these catalysts for the benzylation of toluene. (c) 2006 Elsevier Inc. All rights reserved.</p>10aammonia-TPD10abenzylation reaction10aCe-Al-MCM-4110aFriedel-Crafts alkylation10apyridine-FrIR1 aKalita, Pranjal1 aGupta, Narendra, M.1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/synergistic-role-acid-sites-ce-enhanced-activity-mesoporous-ce-al-mcm-41-catalysts02437nas a2200301   4500008004100000022001400041245011900055210006900174260007300243300001000316490000800326520141300334653001501747653001001762653001001772653001001782653002701792653001401819653001301833100002701846700002401873700002001897700002501917700002001942700002401962700001701986856013202003       2007                        eng d  a1387-181100aSynthesis and characterization of NCL-5, NCL-6 and NCL-7: new zeolites enriched with polymorph B of the BEA family0 aSynthesis and characterization of NCL5 NCL6 and NCL7 new zeolite  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcSEP  a82-880 v1053 a<p>The synthesis of all-silica analogs of polymorph B-enriched zeolites of the BEA family denoted as NCL-5, NCL-6 and NCL-7 was realized hydrothermally at lower water content in fluoride medium using perchloric acid as promoter and terraethylammonium hydroxide as template. The present article explains the effect of different synthesis parameters on NCL-5, NCL-6 and NCL-7. The samples were characterized using XRD, low temperature N-2-adsorption, Si-29 MAS NMR and FTIR spectroscopy. The phase composition of the structures was derived using simulated patterns for the random intergrowths of polymorphs A and B using DIFFaX Code. The stacking direction c' is perpendicular to the a'b' plane of the layer. The phase composition of polymorph B derived using DIFFaX code was found to be 90-95%. 70-75% and 60-65% in NCL-5, NCL-6 and NCL-7, respectively. The gradual decrease of polymorph B concentration in these samples showed a correlation with the decrease in water/SiO2 molar ratio in gel. The framework FTIR spectral analysis of NCL-5 and all-silica-beta supported the postulation that significant enrichment of polymorph B in NCL-5 compared to that in all-silica-beta, as indicated by the relative intensities of pair of bands at 1097 and 1018 cm(-1) and 460 and 423 cm(-1) vibrations, leads to more tortuous channel structure associated with polymorph B. (C) 2007 Elsevier Inc. All riahts reserved.</p>10aBEA family10aNCL-510aNCL-610aNCL-710apolymorph B enrichment10asynthesis10azeolites1 aKadgaonkar, Mahesh, D.1 aKasture, Mahesh, W.1 aBhange, Deu, S.1 aJoshi, Praphulla, N.1 aRamaswamy, Veda1 aGupta, Narendra, M.1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/synthesis-and-characterization-ncl-5-ncl-6-and-ncl-7-new-zeolites-enriched-polymorph-b-bea-001174nas a2200241   4500008004100000022001400041245012200055210006900177260006100246300001200307490000800319520032100327653001900648653001000667653001800677653001000695653002900705653001000734100002300744700002100767700001700788856012700805       2008                        eng d  a1011-372X00aHighly chemoselective catalytic system for hydrogenation of diketones to ketols: an environmentally benevolent system0 aHighly chemoselective catalytic system for hydrogenation of dike  a233 SPRING STREET, NEW YORK, NY 10013 USAbSPRINGERcJAN  a257-2600 v1203 a<p>Ru(Phen)(2)Cl-2 [Phen = Phenanthroline] anchored in organo-functionalized MCM-41 [Ru(Phen)(2)Cl-NH-MCM-41] efficiently catalyzes highly chemoselective hydrogenation of diketones to ketols (Sel. similar to 99%) under environmentally benign tri-phasic (solid-liquid-liquid) reaction condition in aqueous medium.</p>10aChemoselective10adione10aHydrogenation10aketol10aruthenium phenanthroline10aWater1 aDeshmukh, Amit, A.1 aKinage, Anil, K.1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/highly-chemoselective-catalytic-system-hydrogenation-diketones-ketols-environmentally-001512nas a2200181   4500008004100000022001400041245014700055210006900202260011000271300001400381490000700395520072000402100002201122700002501144700001701169700001801186856012601204       2008                        eng d  a0959-942800aIn situ synthesis of Pt nanoparticles in SBA-15 by encapsulating in modified template micelles: size restricted growth within the mesochannels0 aIn situ synthesis of Pt nanoparticles in SBA15 by encapsulating   aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB  a1765-17700 v183 a<p>A truly in situ and simple method is developed for nanoparticle incorporation within the mesochannels of SBA-15 involving dispersion of metal precursors in surfactant-modified polymer micelles. The diffusion of the precursor within the micellar structure is aided by interaction with the cationic head group of the surfactant leading to a unique method to facilitate the formation of highly disperse, uniform nanoparticles molded by the walls of the mesochannels. The nanoparticle incorporated mesoporous material has a highly enhanced surface area and adsorption capabilities in comparison to its parent materials without any pore blockage which makes this method ideal for the preparation of nanocatalysts.</p>1 aPrashar, Atul, K.1 aHodgkins, Robert, P.1 aKumar, Rajiv1 aDevi, Nandini  uhttps://library.ncl.res.in/content/situ-synthesis-pt-nanoparticles-sba-15-encapsulating-modified-template-micelles-size-001633nas a2200229   4500008004100000022001400041245013100055210006900186260006100255300001200316490000800328520074100336653003701077653001901114653003601133653002301169653002601192100002201218700001701240700002401257856012201281       2008                        eng d  a1011-372X00aStructure sensitivity of nano-structured CdS/SBA-15 containing Au and PtCo-catalysts for the photocatalytic splitting of water0 aStructure sensitivity of nanostructured CdSSBA15 containing Au a  a233 SPRING STREET, NEW YORK, NY 10013 USAbSPRINGERcMAR  a226-2330 v1213 a<p>Photocatalysts containing nanocrystallites of cadmium sulphide dispersed in the channels of mesoporous silicate SBA-15 exhibited enhanced activity for visible-light mediated splitting of water, as compared to bulk CdS. Whereas the incorporation of 1 wt.% Pt co-catalyst in CdS/SBA-15 led to a substantial increase in H-2 yield, Au at similar loading resulted in marginally decreased activity. The results indicate that the photocatalytic activity of CdS crystallites is structure sensitive. Similarly, the role of a noble metal may be associated with the particle size dependent micro-structural features, rather than its electronic properties such as the work function or the heat of adsorption of reactant or product molecules.</p>10anano-structured cadmium sulphide10aPhotocatalysis10arole of noble metal co-catalyst10aSplitting of water10astructure sensitivity1 aLunawat, Puja, S.1 aKumar, Rajiv1 aGupta, Narendra, M.  uhttps://library.ncl.res.in/content/structure-sensitivity-nano-structured-cdssba-15-containing-au-and-ptco-catalysts-001532nas a2200253   4500008004100000022001400041245013100055210006900186260007300255300001000328490000800338520056900346653002100915653002800936653002700964653003200991653003301023653001401056100002101070700002001091700001701111700001801128856013201146       2009                        eng d  a0926-860X00aSynthesis, characterization and catalytic performance of Sn-MCM-48 in solvent-free Mukaiyama-type aldol condensation reactions0 aSynthesis characterization and catalytic performance of SnMCM48   aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a88-940 v3583 a<p>The influence of various synthesis variables on the physico-chemical properties of mesoporous stannosilicate molecular sieves with MCM-48 structure (Sn-MCM-48) has been investigated. Sn-MCM48 has been used as a new heterogeneous catalyst in solvent-free Mukaiyama-type aldol reactions. Invariably, the beta-hydroxy ester selectivity was found to be 100% irrespective of the conversion level. The product yield was found to increase, to reach a maximum (70%), and then to decrease with the increase in tin content. (C) 2009 Elsevier B.V. All rights reserved.</p>10aCharacterization10aheterogeneous catalysis10aHydrothermal synthesis10aMesoporous molecular sieves10aMukaiyama-aldol condensation10aSn-MCM-481 aTaralkar, U., S.1 aKalita, Pranjal1 aKumar, Rajiv1 aJoshi, P., N.  uhttps://library.ncl.res.in/content/synthesis-characterization-and-catalytic-performance-sn-mcm-48-solvent-free-mukaiyama-type-002025nas a2200241   4500008004100000022001400041245011900055210006900174260010600243300001400349490000700363520106900370653002401439653003401463653003301497653002501530653001401555100002301569700002101592700001701613700002201630856013101652       2010                        eng d  a0277-538700aEfficient heterogeneous catalytic system for chemoselective hydrogenation of unsaturated ketones in aqueous medium0 aEfficient heterogeneous catalytic system for chemoselective hydr  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcNOV  a3262-32680 v293 a<p>A highly chemoselective and green heterogeneous catalytic system of immobilized Ru(II)-phenanthroline complexes on amino functionalised MCM-41 material for the chemoselective hydrogenation of unsaturated ketones to unsaturated alcohols is demonstrated using water as a solvent The XRD and FTIR spectra show the highly ordered hexagonal nature of the MCM-41 even after encapsulation of the ruthenium complex The complex retains its configuration after anchoring as was confirmed by FTIR and UV-Vis analysis The detailed reaction parametric effect was studied for the hydrogenation of 3 methylpent-3-en-2-one to achieve complete conversion up to &gt;99% chemoselectivity of 3-methylpent-3-en-2 ol The anchored heterogeneous catalysts were recycled effectively and reused five times with marginal changes in activity and selectivity The use of water as a solvent not only afforded high activity for the hydroge nation reaction compared to organic solvents but also afforded a green process Crown Copyright (C) 2010 Published by Elsevier Ltd All rights reserved</p>10a1 10 Phenanthroline10aalpha beta Unsaturated ketone10aChemoselective hydrogenation10amesoporous materials10aruthenium1 aDeshmukh, Amit, A.1 aKinage, Anil, K.1 aKumar, Rajiv1 aMeijboom, Reinout  uhttps://library.ncl.res.in/content/efficient-heterogeneous-catalytic-system-chemoselective-hydrogenation-unsaturated-ketones-002066nas a2200277   4500008004100000022001400041245012400055210006900179260007300248300001200321490000800333520109900341653002601440653001801466653001901484653001301503653001801516653001901534653001401553653001001567100002301577700002101600700001701621700002201638856012801660       2010                        eng d  a1381-116900aHeterogenized Ru(II) phenanthroline complex for chemoselective hydrogenation of diketones under biphasic aqueous medium0 aHeterogenized RuII phenanthroline complex for chemoselective hyd  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC  a114-1200 v3333 a<p>The chemoselective hydrogenation of acetylacetone to 4-hydroxypentan-2-one over immobilized ruthenium phenanthroline metal complexes in amino functionalized MCM-41 in biphasic aqueous reaction medium was investigated. The catalyst was characterized by XRD, TEM, surface analysis, FT-IR and UV-vis to understand the morphology, complex geometry, and XPS such that the oxidation state of the metal complex inside the MCM-41 framework could be understood. The use of water as a solvent, not only gives high activity and selectivity for hydrogenation of acetylacetone, but also gives a path for an environmentally safer process. The optimizations of ligand, metal to ligand ratio, the choice of solvent and other reaction parameters were studied in detail. The heterogeneous catalytic system gave a higher degree of chemoselectivity (99%) towards 4-hydroxypentan-2-one as compared to homogeneous catalyst when hydrogenation was carried out using water as a solvent. The immobilized ruthenium-phenanthroline complex was easily separated and reused. (C) 2010 Elsevier B.V. All rights reserved.</p>10a4-Hydroxypentan-2-one10aacetylacetone10aChemoselective10aDiketone10aHydrogenation10aPhenanthroline10aruthenium10aWater1 aDeshmukh, Amit, A.1 aKinage, Anil, K.1 aKumar, Rajiv1 aMeijboom, Reinout  uhttps://library.ncl.res.in/content/heterogenized-ruii-phenanthroline-complex-chemoselective-hydrogenation-diketones-under-001503nas a2200193   4500008004100000022001400041245011300055210006900168260007100237300001600308490000700324520074800331100002301079700002201102700002101124700001701145700002201162856012501184       2010                        eng d  a0888-588500aRu(II) phenanthroline complex as catalyst for chemoselective hydrogenation of nitro-aryls in a green process0 aRuII phenanthroline complex as catalyst for chemoselective hydro  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcDEC  a12180-121840 v493 a<p>Ru(II) Phenanthroline [Ru(II)(Phen)(n) where n = 1,2,3] complexes were used as highly chemoselective catalysts for hydrogenation of nitro aryls using molecular hydrogen in an aqueous media. Water, universal solvent, was used as a reaction mixture for hydrogenation of nitro-aryls to make the process green. The chemoselectivity in hydrogenation of substituted nitrobenzene to substituted aniline was obtained as high as &gt;99% at about complete conversion of substituted nitrobenzene. The parametric effects, including effect of solvent, effect of ligand, effect of metal to ligand ratio, effect of temperature and pressure, were studied in detail to obtain the best results. The Ru(Phen)(n) was characterized by FTIR, UV-vis, and XPS.</p>1 aDeshmukh, Amit, A.1 aPrashar, Atul, K.1 aKinage, Anil, K.1 aKumar, Rajiv1 aMeijboom, Reinout  uhttps://library.ncl.res.in/content/ruii-phenanthroline-complex-catalyst-chemoselective-hydrogenation-nitro-aryls-green-001453nas a2200229   4500008004100000022001400041245016900055210006900224260007300293300001200366490000800378520054500386653000600931653000600937653003700943653003600980653002501016653002101041100002001062700001701082856012401099       2011                        eng d  a0926-860X00aImmobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene over mesoporous materials: an efficient catalyst for michael-addition reactions under solvent-free condition0 aImmobilization of 157triazabicyclo 440 dec5ene over mesoporous m  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a250-2580 v3973 a<p>Immobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene (TBD, a bicylic guanidine base) over mesoporous material like SBA-15 has been found to be an excellent catalyst for Michael-addition of beta-nitro styrene with malonate. The reactions were performed under solvent-free condition at 373 K for 9 h. A wide variety of Michael donors and acceptors were investigated. Among them, high yield of Michael product was obtained for the reaction between p-Cl-nitrostyrene with dimethyl malonate. (C) 2011 Elsevier B.V. All rights reserved.</p>10a110a510a7-triazabicyclo[4.4.0] dec-5-ene10abeta-nitro styrene and malonate10amesoporous materials10aMichael-addition1 aKalita, Pranjal1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/immobilization-157-triazabicyclo-440-dec-5-ene-over-mesoporous-materials-efficient-001786nas a2200217   4500008004100000022001400041245009300055210006900148260007300217300001000290490000800300520097900308653001801287653001701305653003401322653002401356100002001380700002401400700001701424856012701441       2011                        eng d  a1387-181100aSolvent-free mukaiyama-aldol condensation catalyzed by Ce-Al-MCM-41 mesoporous materials0 aSolventfree mukaiyamaaldol condensation catalyzed by CeAlMCM41 m  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a82-900 v1443 a<p>MCM-41 samples containing Ce4+ and Al3+ in the network, designated as Ce-x-Al-MCM-41 (x = 0.0-0.04), were synthesized and characterized systematically. These samples exhibited higher catalytic activity for Mukaiyama-aldol condensations to produce beta-hydroxy carbonyl compounds under the solvent free conditions, compared to the samples containing either of the two cations. The product yield was found to depend on the electron donating/withdrawing characteristics of reactant molecules being responsible for the observed trend. Series of solvents were also investigated but considerably high yield of aldol products (similar to 95%) could be achieved without using any solvents. In all the cases, the selectivity was found to be 100%, typical of such Mukaiyama-aldol condensations. The higher catalytic activity of Ce-x-Al-MCM-41 is explained on the basis of certain new acid sites generated due to co-incorporation of Ce and Al cations. Published by Elsevier Inc.</p>10aAcid catalyst10aCe-Al-MCM-4110aSilyl enol ether and aldehyde10aSilyl ketene acetal1 aKalita, Pranjal1 aGupta, Narendra, M.1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/solvent-free-mukaiyama-aldol-condensation-catalyzed-ce-al-mcm-41-mesoporous-materials-001443nas a2200229   4500008004100000022001400041245008000055210006900135260007300204300000800277490000800285520066400293653001300957653002300970653002200993653002201015653001501037653001101052100002001063700001701083856011301100       2012                        eng d  a1387-181100aSolvent-free coumarin synthesis via pechmann reaction using solid catalysts0 aSolventfree coumarin synthesis via pechmann reaction using solid  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB  a1-90 v1493 a<p>A solvent-free versatile and efficient methodology, reported here, allows the synthesis of coumarin by hydroxyalkylation of phenols with ethyl or methyl acetoacetate (via Pechmann reaction) using trifluoromethanesulfonic acid (trifle acid) functionalised Zr-TMS (Zr-TMS, zirconia based transition metal oxide mesoporous molecular sieves) catalysts with different loadings of triflic acid over Zr-TMS (5-25 wt.%) where the total acid strength of acid functionalised Zr-TMS material is increased as increasing loading of triflic acid from 5 to 25 wt.% leading to correspond increased higher catalytic activity. (C) 2011 Elsevier Inc. All rights reserved.</p>10aCoumarin10aEthyl acetoacetate10aFunctionalization10aPechmann reaction10aResorcinol10aZr-TMS1 aKalita, Pranjal1 aKumar, Rajiv  uhttps://library.ncl.res.in/content/solvent-free-coumarin-synthesis-pechmann-reaction-using-solid-catalysts-002305nas a2200277   4500008004100000022001400041245009800055210006900153260011100222300001200333490000700345520133600352653001701688653001201705653001001717653001801727653001801745100002501763700001501788700001701803700001901820700002601839700001701865700001701882856012801899       2014                        eng d  a1573-413700aExtracellular biosynthesis of metal sulfide nanoparticles using the fungus fusarium oxysporum0 aExtracellular biosynthesis of metal sulfide nanoparticles using   aEXECUTIVE STE Y-2, PO BOX 7917, SAIF ZONE, 1200 BR SHARJAH, U ARAB EMIRATESbBENTHAM SCIENCE PUBL LTDcJUL  a588-5950 v103 a<p>The development of reliable, eco-friendly processes for the synthesis of nanomaterials is an important aspect of nanotechnology. One approach that shows immense potential is based on the biosynthesis of nanoparticles using microorganisms such as bacteria. In this report, we demonstrate the extracellular biosynthesis and complete characterization of metal sulfide (PbS, ZnS, MnS and NiS) nanoparticles using fungus, Fusarium oxysporum. We observed that the exposure of aqueous solution of 1 mM metal sulfate to fungus Fusarium oxysporum resulted in the formation of highly stable technologically important metal sulfide semiconductor nanoparticles. Fusarium oxysporum synthesizes lead sulfide and zinc sulfide nanoparticles of fractal type structure whereas manganese sulfide and nickel sulfide nanoparticles are of variable polydispersed morphology. The variable morphology may be due to the dissimilar interaction of metal sulfide nanoparticles with capping proteins secreted by the fungus in solution. The nanoparticles solution is found to be extremely stable with little evidence of aggregation even after a month of storage. The long term stability of the nanoparticles is due to the proteins secreted by fungus in the nanoparticle solution which bind to the surface of the nanoparticles and thus prevent aggregation.</p>10aBiosynthesis10aenzymes10afungi10ametal sulfide10aNanoparticles1 aSenapati, Satyajyoti1 aSyed, Asad1 aKhan, Shadab1 aPasricha, Renu1 aKhan, Mohammad, Islam1 aKumar, Rajiv1 aAhmad, Absar  uhttps://library.ncl.res.in/content/extracellular-biosynthesis-metal-sulfide-nanoparticles-using-fungus-fusarium-oxysporum-0