02326nas a2200241 4500008004100000022001400041245018300055210006900238260007300307300001200380490000800392520131100400653001801711653002901729653005701758653003301815653002301848100002301871700001701894700001901911700002801930856012601958 2005 eng d a1381-116900aBis(2-[alpha-hydroxyethyl]benzimidazolato)copper(II) anchored onto chloromethylated polystyrene for the biomimetic oxidative coupling of 2-aminophenol to 2-aminophenoxazine-3-one0 aBis2alphahydroxyethylbenzimidazolatocopperII anchored onto chlor aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL a132-1380 v2363 a

2-(alpha-Hydroxyethyl)benzimidazole (Hhebmz) has been covalently anchored to chloromethylated polystyrene cross-linked with 5% divinylbenzene. This polymer-anchored chelating resin reacts with cupric acetate in presence of Hhebmz to give polymer-anchored copper(II) complex PS-[Cu(hebmz)(2)]. Elemental analyses, FT-IR, electronic, scanning electron micrographs (SEM) and TGA-DTA pattern have been used to characterize the complex. Oxidative coupling of 2-aminophenol (OAP) to 2-aminophenoxazine-3-one (APX) catalyzed by PS-[Cu(hebmz)(2)] in presence of air at 70 degrees C in DMF gave 62% substrate conversion over a period of 8 h. Kinetics of the above reaction indicated that the rate of oxidative coupling of OAP has a first order dependence with respect to substrate, catalyst and air pressure (dissolved O-2) concentrations in the range of conditions evaluated. Based on these observations, a plausible mechanism for the above reaction has been proposed. From, the study on the effect of temperature on the rates of oxidative coupling, an activation energy 34.2 kcal/degree mole was evaluated from Arrhenius plot of -ln rate versus 1/T. Enthalpy, entropy and free energy were calculated using standard thermodynamic equations for the above reaction. (c) 2005 Elsevier B.V. All rights reserved.

10a2-aminophenol10a2-aminophenoxazine-3-one10abis(2-[alpha-hydroxyethyl]benzimidazolato)copper(II)10achloromethylated polystyrene10aoxidative coupling1 aMaurya, Mannar, R.1 aSikarwar, S.1 aJoseph, Trissa1 aHalligudi, Shivappa, B. uhttps://library.ncl.res.in/content/bis2-alpha-hydroxyethylbenzimidazolatocopperii-anchored-chloromethylated-polystyrene-101799nas a2200217 4500008004100000022001400041245013000055210006900185260007300254300001200327490000800339520095800347653001001305653003201315653002701347653001701374100001901391700001401410700002801424856012901452 2005 eng d a1381-116900aBronsted acidic ionic liquids: a green, efficient and reusable catalyst system and reaction medium for fischer esterification0 aBronsted acidic ionic liquids a green efficient and reusable cat aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN a107-1100 v2343 a

Bronsted acidic ionic liquid containing nitrogen-based organic cations 1-methylimidazole and 1-butyl-3-methylimidazolium and inorganic anions of the type BF4-, PF6- and PTSA(-) has been synthesized in good yields and used as a catalysts and reaction medium for Fischer esterification of alcohols with acids. These were characterized using FTIR and NMR spectroscopy. Ionic liquids as catalyst afforded good alcohol conversion and excellent ester selectivity. Fischer esterification of acetic acid with benzyl alcohol with different Bronsted acidic ionic liquids was carried out. Maximum substrate conversion 100 % and product selectivity 100 % was observed on using [BMIM](+)PTSAas catalyst over a period of 2 h. The ester was easily separated from the reaction mixture and the ionic liquid was reused four times after removing water. No significant loss in catalytic activity was observed on recycling. (c) 2005 Elsevier B.V. All rights reserved.

10aacids10aalcohol and reaction medium10aFischer esterification10aIonic liquid1 aJoseph, Trissa1 aSahoo, S.1 aHalligudi, Shivappa, B. uhttps://library.ncl.res.in/content/bronsted-acidic-ionic-liquids-green-efficient-and-reusable-catalyst-system-and-reaction-101890nas a2200241 4500008004100000022001400041245011100055210006900166260007300235300001200308490000800320520101700328653001101345653001201356653001301368653001901381653003001400653002101430100001901451700002101470700002801491856012901519 2005 eng d a1381-116900aCopper(II) ion-exchanged montmorillonite as catalyst for the direct addition of N-H bond to CC triple bond0 aCopperII ionexchanged montmorillonite as catalyst for the direct aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL a139-1440 v2363 a

An efficient synthesis of phenyl-(1-phenylethylidene)amine using copper-exchanged montmorillonite clay (Cu K-10) is demonstrated. The catalyst was characterized using UV-vis, XRD, BET surface area measurements, pyridine adsorption etc. The XRD and surface area measurement show that the structural characteristics of the support montmorillonite K-10 (K-10) are preserved after Cu exchange. The hydroamination of phenyl acetylene with aniline was carried out in toluene under reflux condition in N-2 atmosphere at 393 K. The reaction is highly regio-selective for only Markovnikoff's addition of an-tine to CC multiple bond and proceeded smoothly to completion. The reaction conditions were optimized to obtain complete conversion with respect to phenyl acetylene. Reaction data showed that the activity of the catalyst in hydroamination reaction is greater at higher reaction temperatures and nonpolar solvents and NZ pressure promotes the reaction drastically. (c) 2005 Elsevier B.V. All rights reserved.

10aalkyne10aAniline10aCatalyst10ahydroamination10aK-10 montmorillonite clay10aphenyl acetylene1 aJoseph, Trissa1 aShanbhag, G., V.1 aHalligudi, Shivappa, B. uhttps://library.ncl.res.in/content/copperii-ion-exchanged-montmorillonite-catalyst-direct-addition-n-h-bond-cc-triple-bond-001726nas a2200217 4500008004100000022001400041245009400055210006900149260007300218300001200291490000800303520090900311653004101220653002901261653001301290653002501303653000801328100001901336700002801355856012501383 2005 eng d a1381-116900aOxyfunctionalization of limonene using vanadium complex anchored on functionalized SBA-150 aOxyfunctionalization of limonene using vanadium complex anchored aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR a241-2470 v2293 a

VO(Salten) complexes, where Salten = 3-[N,N'-bis-3(salicylidenamino)ethyltriamine], have been covalently anchored on to functionalized SBA-15. The formation and integrity of the complex have been confirmed by elemental analysis, Fr-IR, X-ray diffraction (XRD) and BET measurements and the complex was used for the oxyfunctionalization of limonene in presence of urea hydroperoxide (UHP) as the oxidizing agent. The oxyfunctionalization of limonene resulted in limonene oxide, carvone, carvacrol and carveol. Anchored complex showed better catalytic activity than the neat complex, while the neat complexes has deactivated in the reaction due to formation of inactive alpha-oxo-bridged dimers, the covalently anchored complexes remained stable throughout the reaction. The anchored complex could be easily separated from the products and could be reused. (C) 2004 Elsevier B.V. All rights reserved.

10acovalently anchored vanadium complex10afunctionalized Si-SBA-1510alimonene10aoxofunctionalization10aUHP1 aJoseph, Trissa1 aHalligudi, Shivappa, B. uhttps://library.ncl.res.in/content/oxyfunctionalization-limonene-using-vanadium-complex-anchored-functionalized-sba-15-101408nas a2200241 4500008004100000022001400041245017900055210006900234260007300303300001000376490000700386520037900393653004100772653004300813653004500856653003100901100002300932700001700955700001900972700002800991700002801019856011901047 2005 eng d a1381-514800aSynthesis, characterization and catalytic potentials of polymer anchored copper(II), oxovanadium(IV) and dioxomolybdenum(VI) complexes of 2-(alpha-hydroxymethyl)benzimidazole0 aSynthesis characterization and catalytic potentials of polymer a aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR a71-830 v633 a

{2-(alpha-Hydroxymethyl)benzimidazole (Hhmbmz) has been covalently anchored to chloromethylated polystyrene cross-linked with 5% divinylbenzene. This chelating resin reacts with cupric acetate, vanadyl sulphate and [MoO(2)-(acac)(2)] (Hacac = acetylacetone) in presence of Hhmbmz to give complexes PS-[Cu(hmbmz)(2)], PS-[VO(hmbmz)(2)] and PS-[MoO(2)(hmbmz)(2)] (where

10a2-(alpha-hydroxymethyl)benzimidazole10aoxidation of styrene and ethyl benzene10aoxidative bromination of salicylaldehyde10apolymer anchored-complexes1 aMaurya, Mannar, R.1 aSikarwar, S.1 aJoseph, Trissa1 aManikandan, Palanichamy1 aHalligudi, Shivappa, B. uhttps://library.ncl.res.in/content/synthesis-characterization-and-catalytic-potentials-polymer-anchored-copperii-102744nas a2200265 4500008004100000022001400041245012400055210006900179260007300248300001200321490000800333520176200341653001002103653001102113653003802124653002902162653002002191653001902211653003002230100001902260700002102279700001902300700002802319856013102347 2006 eng d a1381-116900aChemoselective anti-Markovnikov hydroamination of alpha,beta-ethylenic compounds with amines using montmorillonite clay0 aChemoselective antiMarkovnikov hydroamination of alphabetaethyle aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY a210-2170 v2503 a

The catalytic activity of montmorillonite clays as a catalyst for the hydroamination of alpha,beta-ethylenic compounds with amines was tested. Aniline and substituted amines reacted with alpha,beta-ethylenic compounds in the presence of catalytic amount of commercially available clay to afford exclusively anti-Markovnikov adduct in excellent yields. Aniline reacted with ethyl acrylate to yield only anti-Markovnikov adduct N-[2-(ethoxycarbonyl)ethyl] aniline (mono-addition product). No Markovnikov adduct (N-[1-(ethoxycarbonyl)ethyl]aniline and double addition product N,N-bis[2-(ethoxycarbonyl)ethyl]aniline were formed under selected reaction conditions. For a better exploitation of the catalytic activity in terms of increased activity and improved selectivity for the mono-addition product, the reaction parameters were optimized in terms of temperature, solvent, reactant mole ratio. Under optimized reaction conditions, montmorillonite clay K-10 showed a superior catalytic performance in the hydroamination of ethyl acrylate with aniline with a conversion of aniline to mono-addition product (almost 100% chemoselectivity) with a high rate constant 0.3414 min(-1) compared to the reported protocols. The dependence of conversion of aniline over different types of montmorillonite clays (K-10, K-20, K-30, Al-Pillared clay and untreated clay) has also been discussed. The activities of clay for the hydroamination of different aromatic and aliphatic amines have also been investigated. Under harsh reaction conditions (increased temperature and long reaction time) small amounts of di-addition products were observed. The kinetics data has been interpreted using the initial rate approach model. (c) 2006 Elsevier B.V. All rights reserved.

10aalpha10aamines10aanti-Markovnikov addition product10abeta-ethylenic compounds10achemo-selective10ahydroamination10aK-10 montmorillonite clay1 aJoseph, Trissa1 aShanbhag, G., V.1 aSawant, D., P.1 aHalligudi, Shivappa, B. uhttps://library.ncl.res.in/content/chemoselective-anti-markovnikov-hydroamination-alphabeta-ethylenic-compounds-amines-using-101534nas a2200217 4500008004100000022001400041245010400055210006900159260007300228300001200301490000600313520069500319653003201014653002401046653002801070100001901098700001701117700002201134700002801156856013201184 2007 eng d a1566-736700aAu-Pt nanoparticles in amine functionalized MCM-41: catalytic evaluation in hydrogenation reactions0 aAuPt nanoparticles in amine functionalized MCM41 catalytic evalu aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR a629-6340 v83 a

Nano-sized Au-Pt nanoparticles (Au-Pt-bi-MNPs) have been synthesized by the simultaneous reduction of HAuCl4 and HPtCl6 by NaBH4 inside the channels of amine functionalized Si-MCM-41 (NH2-Si-MCM-41) at ambient conditions. These materials were characterized using chemical analysis, UV-vis, XPS, XRD, FT-IR, Surface area and TEM analysis. The size of these alloyed nanoparticles (bi-MNPs) were found in the range of 2-4 nm. These nanoparticles were evaluated to study their catalytic activities towards hydrogenation of aromatic nitro compounds. The catalytic activity of the Au-Pt bi-MNPs was found to be superior to monometallic An nanoparticles. (c) 2006 Published by Elsevier B.V.

10aamine-functionalized MCM-4110aAu-Pt nanoparticles10aCatalytic hydrogenation1 aJoseph, Trissa1 aKumar, Vijay1 aRamaswamy, A., V.1 aHalligudi, Shivaraj, B. uhttps://library.ncl.res.in/content/au-pt-nanoparticles-amine-functionalized-mcm-41-catalytic-evaluation-hydrogenation-reactions02108nas a2200277 4500008004100000022001400041245013500055210006900190260009500259300001200354490000800366520111500374653001301489653001301502653001101515653001001526653002001536653001801556653001901574653001701593653001501610100002701625700001901652700002801671856013101699 2007 eng d a0021-951700aCopper(II) ion exchanged A1SBA-15: a versatile catalyst for intermolecular hydroamination of terminal alkynes with aromatic amines0 aCopperII ion exchanged A1SBA15 a versatile catalyst for intermol a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcSEP a274-2820 v2503 a

The hydroarnination reaction offers a very attractive route for the synthesis of alkylated amines and their derivatives with no byproduct formation. AISBA-15 was synthesized by isomorphous substitution of aluminum into the framework of SBA-15, which induces the Bronsted acid sites, and these were exchanged with metal ions such as Cu2+, Zn2+, and Pd2+. The catalysts were characterized by XRD, N-2-sOrption, SEM, TEM, acidity measurements by FT-IR pyridine adsorption, H-2-TPR, (27)AI MAS NMR, and Si-29 MAS NMR. Hydroamination of phenylacetylene (PhAc) with 2,4-xylidine has been used as a test reaction, which gave N-(1-phenylethylidene)-2,4-dimethylaniline with no byproduct formation. CuAlSBA-15 and CuAIMCM-41 showed around three times greater activity in hydroamination of PhAc compared with Cu-clay and Cu-beta, due to the moderate Lewis acidity of Cu2+ present in mesoporous supports. The performance of the CuAlSBA-15 was also determined with different alkynes and amines to evaluate the catalyst's general applicability in hydroamination reactions. (c) 2007 Elsevier Inc. All rights reserved.

10aA1SBA-1510aaddition10aalkyne10aAmine10aCopper catalyst10aheterogeneous10ahydroamination10aion exchange10aMesoporous1 aShanbhag, Ganapati, V.1 aJoseph, Trissa1 aHalligudi, Shivaraj, B. uhttps://library.ncl.res.in/content/copperii-ion-exchanged-a1sba-15-versatile-catalyst-intermolecular-hydroamination-terminal-0