- Palladated composite of Cu-BDC MOF and perlite as an efficient catalyst for hydrogenation of nitroarenes
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A novel composite of metal-organic framework and perlite is prepared through hydrothermal treatment of terephthalic acid and Cu(NO3)2·3H2O in the presence of perlite. The resulting composite was then utilized as a support for the immobilization of Pd nanoparticles. The obtained compound was characterized via XRD, TGA, ICP, FTIR, TEM, FE-SEM/EDS and elemental mapping analysis and applied as a catalyst for the hydrogenation of nitroarenes under mild reaction condition. The results approved that the catalyst could efficiently promote hydrogenation of various nitroarenes with different electronic densities and steric properties. Moreover, the catalyst showed high selectivity towards hydrogenation of nitro groups. Hot filtration test affirmed heterogeneous nature of catalysis. Furthermore, the present catalytic composite was highly recyclable with low Pd leaching. A comparative study also approved superior activity of the composite compared to palladated perlite and metal-organic framework.
- Koohestani, Fatemeh,Sadjadi, Samahe
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- Continuous flow hydrogenation of nitroarenes, azides and alkenes using maghemite-Pd nanocomposites
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Maghemite-supported ultra-fine Pd (1-3 nm) nanoparticles, prepared by a simple co-precipitation method, find application in the catalytic continuous flow hydrogenation of nitroarenes, azides, and alkenes wherein they play an important role in the reduction of various functional groups on the surface of maghemite with catalyst loading (~6 wt% Pd). The salient features of the protocol include expeditious formation of reduced products in high yields under near ambient conditions with recycling of the catalyst (up to 12 cycles) without any decrease in selectivity and yield.
- Rathi, Anuj K.,Gawande, Manoj B.,Ranc, Vaclav,Pechousek, Jiri,Petr, Martin,Cepe, Klara,Varma, Rajender S.,Zboril, Radek
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p. 152 - 160
(2015/12/31)
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- An abnormal N-heterocyclic carbene based nickel complex for catalytic reduction of nitroarenes
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Herein we report the synthesis of a nickel(ii) dichloro complex bearing an abnormal N-heterocyclic carbene (aNHC). The NiCl2(aNHC)2 complex has been used as an efficient catalyst for the reduction of nitroarenes with hydrosilanes to give aromatic amines in good to excellent yields. This catalytic protocol can tolerate functional groups such as halides, alkenes or nitriles. Furthermore, the longevity of the catalyst was tested in successive catalytic cycles, which indicates a sustained catalytic activity over multiple catalytic cycles.
- Vijaykumar, Gonela,Mandal, Swadhin K.
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p. 7421 - 7426
(2016/06/01)
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- Benzodioxane group containing hole-transport material, preparation method therefor and application of hole-transport material
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The invention discloses a benzodioxane group containing hole-transport material, a preparation method therefor and an application of the hole-transport material and belongs to the technical field of perovskite solar cells. The hole-transport material has a molecular structure represented by a formula shown in the description. The invention also discloses the preparation method for the hole-transport material and the application of the hole-transport material in perovskite solar cell devices. Simultaneously, the invention also discloses a perovskite solar cell device. According to the hole-transport material disclosed by the invention, different alkyl chains are introduced to a parent nucleus or side chain so as to improve solubility; by introducing diarylamine with a spatial three-dimensional form or a carbazole group, the crystallization of the material can be avoided, and then, the stability of the material is improved; and meanwhile, due to a spatial three-dimensional structure, the solubility of the material can be improved, and then, the film forming property is improved.
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Paragraph 0078; 0079
(2016/10/10)
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- Highly selective transfer hydrogenation of functionalised nitroarenes using cobalt-based nanocatalysts
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Anilines are important feedstock for the synthesis of a variety of chemicals such as dyes, pigments, pharmaceuticals and agrochemicals. The chemoselective catalytic reduction of nitro compounds represents the most important and prevalent process for the manufacture of functionalized anilines. Consequently, the development of selective catalysts for the reduction of nitro compounds in the presence of other reducible groups is a major challenge and is crucial. In this regard, herein we show that the cobalt oxide (Co3O4-NGr@C) based nano-materials, prepared by the pyrolysis of cobalt-phenanthroline complexes on carbon constitute highly selective catalysts for the transfer hydrogenation of nitroarenes to anilines using formic acid as a hydrogen source. Applying these catalysts, a series of structurally diverse and functionalized nitroarenes have been reduced to anilines with unprecedented chemo-selectivity tolerating halides, olefins, aldehyde, ketone, ester, amide and nitrile functionalities.
- Jagadeesh, Rajenahally V.,Banerjee, Debasis,Arockiam, Percia Beatrice,Junge, Henrik,Junge, Kathrin,Pohl, Marga-Martina,Radnik, J?rg,Brückner, Angelika,Beller, Matthias
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supporting information
p. 898 - 902
(2015/03/04)
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- AMIDS SUBSTITUTED INDAZOLE DERIVATIVEES AS PLOY (ADP-RIBOSE) POLYMERASE INHIBITORS
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The present invention relates to amide substituted indazoles and benzotriazoles which are inhibitors of the enzyme poly (ADP-ribose) polymerase (PARP), previously known as poly (ADP-ribose) synthase and poly (ADP-ribosyl) transferase. The compounds of the present invention are useful as mono-therapies in tumors with specific defects in DNA-repair pathways, as enhancers of certain DNA-damaging agents such as anticancer agents and radiotherapy, for reducing cell necrosis (in stroke and myocardial infarction), regulating inflammation and tissue injury, treating retroviral infections, and protecting against the toxicity of chemotherapy.
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Page/Page column 55
(2015/04/28)
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- Direct metal-free synthesis of diarylamines from 2-nitropropane via the twofold C-H functionalization of arenes
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Synthesis of symmetric diarylamines via a twofold intermolecular electrophilic C-H functionalization of electron-rich arenes by umpolung-activated nitroalkane in polyphosphoric acid is demonstrated.
- Aksenov, Alexander V.,Aksenov, Nicolai A.,Orazova, Naila A.,Aksenov, Dmitrii A.,Dmitriev, Maksim V.,Rubin, Michael
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p. 84849 - 84855
(2015/10/28)
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- Highly selective reduction of nitroarenes by iron(0) nanoparticles in water
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Highly selective reduction of nitroarenes has been achieved using iron metal nanoparticles in water at room temperature. A wide spectrum of reducible functionalities remained inert under the reaction conditions. During the reaction a change in shape of Fe nanoparticles was observed.
- Dey, Raju,Mukherjee, Nirmalya,Ahammed, Sabir,Ranu, Brindaban C.
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supporting information; experimental part
p. 7982 - 7984
(2012/09/08)
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- Synthesis and spectral properties of 4-amino-and 4-acetylamino-N- arylnaphthalimides containing electron-donating groups in the N-aryl substituent
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A method for the synthesis of N-aryl-substituted 4-amino-and 4-acetylaminonaphthalimide derivatives with mono-and dialkoxy groups or a 15-crown-5 moiety in the N-aryl substituent is described. The introduction of electron-donating alkoxy groups into the benzene ring of the N-aryl fragment results in fluorescence quenching of the naphthalimide chromophore, which is most pronounced in the spectra of N-acetyl derivatives. The photophysical properties of the synthesized 4-amino-and 4-acetylaminonaphthalimides depend on the solvent polarity and its specific solvating ability due to H-bonding. The crown-containing compounds are promising fluorescent chemosensors for metal cations. ; 2009 Springer Science+Business Media, Inc.
- Panchenko,Fedorova,Perevalov,Jonusauskas,Fedorov
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scheme or table
p. 1233 - 1240
(2010/10/04)
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- Direct synthesis of primary arylamines via C-N cross-coupling of aryl bromides and triflates with amides
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Aryl halides and triflates are coupled with primary amides to give the corresponding arylamines in the presence of a palladium catalyst, a suitable ligand, and a base. The catalyst system performs well for a large number of different substrates at 100-150 °C without solvent, and with low catalyst levels (0.12 mol % Pd). Nicotinamide might be useful as a nitrogen source in the Pd-catalyzed amination reaction.
- Romero,Harrak,Basset,Orúe,Pujol
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experimental part
p. 1951 - 1956
(2009/07/11)
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- Synthesis of 6,7-ethylenedioxyquinoxalines and pyrido[2,3-b]pyrazines as intermediates in the preparation of antineoplastic agents
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A convenient procedure for the synthesis of quinoxalines and pyridopyrazines has been developed from aryldiamines. The condensation of aminocarbamates such as 12 with ethyl 2,3-dibromopropionate provide the quinoxaline 14 directly, in a one-step operation. The methodology reported herein represents an alternative to condensation of o-phenylenediamines with α-dicarbonyl compounds for the quinoxalines formation. The same procedure was applied to the 2,3-diaminopyridine to obtain the corresponding pyridopyrazines.
- Mateu,Capilla,Harrak,Pujol
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p. 5241 - 5250
(2007/10/03)
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- HOMOLYTIC AMINATION OF BENZO-1,4-DIOXANE
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When 5,6-benzo-1,4-dioxane was reacted with N,N-dialkylchloramines in the presence of FeSO4 at 10-20 deg C in a solution of acetic and sulfuric acids, 6-(N,N-dialkylamino)benzo-1,4-dioxanes and 6-chloro- and 6,7-dichlorobenzo-1,4-dioxanes were obtained.Under the conditions used in the study mainly chlorination products were synthesized.Reaction of 5,6-benzo-1,4-dioxane with the system (NH3OH)2SO4-TiCl3 resulted in the formation of 6-aminobenzo-1,4-dioxane.
- Zorina, L.N.,Safiev, O.G.,Rakhmankulov, D.L.
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p. 261 - 263
(2007/10/02)
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