T:Toxic;
106-50-3Relevant articles and documents
Silver nanoparticles supported on P, Se-codoped g-C3N4 nanosheet as a novel heterogeneous catalyst for reduction of nitroaromatics to their corresponding amines
Elhampour, Ali,Heravi, Majid M.,Nemati, Firouzeh,Piri, Mohadese
, (2021)
P, Se-codoped g-C3N4 (PSeCN) nanosheet was in situ prepared by facile thermal polymerization of melamine, phosphonitrilic chloride trimer, and selenium black powder as the precursors. It was found as a suitable support for the immobilization of silver nanoparticles (Ag NPs). The prepared nanocatalyst was fully characterized via standard analysis methods including EDX, ICP-OES, XRD, FT-IR, SEM, TEM, and BET. This PSeCN/Ag nanocatalyst with a higher specific surface area compared with CN, showed excellent catalytic activity towards the reduction of several nitroaromatic compounds using sodium borohydride (NaBH4) in short reaction times with high efficiency and good selectivity in water as a green solvent. Significantly, the above-mentioned nanocomposite could be reused six times without appreciable loss of its catalytic activity.
Bakers' yeast-catalyzed ring opening of benzofuroxans: An efficient green synthesis of aryl-1,2-diamines
Borah, Harsha N.,Prajapati, Dipak,Boruah, Romesh C.
, p. 267 - 272 (2009)
A simple and inexpensive method for the reductive cleavage of N-O bond of benzofuroxans with bakers' yeast under nonfermenting condition in aqueous media was achieved. The procedure gives excellent yields of aryl-1,2-diamines. Copyright Taylor & Francis Group, LLC.
Radical reactions in aqueous medium using (Me3Si)3SiH
Postigo, Al,Kopsov, Sergey,Ferreri, Carla,Chatgilialoglu, Chryssostomos
, p. 5159 - 5162 (2007)
(Chemical Equation Presented) (Me3Si)3SiH was used as a successful reagent in a variety of radical-based transformations in water. The system comprising substrate, silane, and initiator (ACCN) mixed in aqueous medium at 100°C worked well for both hydrophilic and hydrophobic substrates, with the only variation that an amphiphilic thiol was also needed in case of the water-soluble compounds.
Efficient hydrogenation catalyst designing via preferential adsorption sites construction towards active copper
Dai, Xingchao,He, Dongcheng,Li, Teng,Shi, Feng,Wang, Hongli,Wang, Tao,Wang, Xinzhi
, p. 397 - 406 (2021)
Based on the experimental and DFT calculation results, here for the first time we built preferential adsorption sites for nitroarenes by modification of the supported Cu catalysts surface with 1,10-phenathroline (1,10-phen), by which the yield of aniline via reduction of nitroarene is enhanced three times. Moreover, a macromolecular layer was in-situ generated on supported Cu catalysts to form a stable macromolecule modified supported Cu catalyst, i.e., CuAlOx-M. By applying the CuAlOx-M, a wide variety of nitroarene substrates react smoothly to afford the desired products in up to > 99% yield with > 99% selectivity. The method tolerates a variety of functional groups, including halides, ketone, amide, and C = C bond moieties. The excellent catalytic performance of the CuAlOx-M can be attributed to that the 1,10-phen modification benefits the preferential adsorption of nitrobenzene and slightly weakens adsorption of aniline on the supported nano-Cu surface.
The Solvent Effect on the Electro-oxidation of 1,4-Phenylenediamine. The Influence of the Solvent Reorientation Dynamics on the One-electron Transfer Rate
Opallo, Marcin
, p. 339 - 348 (1986)
The one-electron electro-oxidation of 1,4-phenylenediamine to the corresponding radical cation has been studied by cyclic voltammetry at a Pt electrode in perchlorate solutions in a wide range of aprotic and hydrogenbonded solvents.A linear relationship between the redox potential of this system and the donor number of a given solvent has been found.It has been shown that the dynamics of solvent reorientation strongly affects the heterogeneous electron transfer rate in the studied case: an almost linear relationship between the standard rate constant and the reciprocal of the longitudinal dielectric relaxation time of a given solvent has been found.It has been suggested that the solvent dynamics affects the rate of the analogous homogeneous electron-transfer reaction.
Visible-light-induced photocatalytic hydrogenation of 4-nitroaniline over In2S3 photocatalyst in water
Wu, Weiming,Lin, Rui,Shen, Lijuan,Liang, Ruowen,Yuan, Rusheng,Wu, Ling
, p. 1 - 4 (2013)
Photocatalytic hydrogenation of 4-nitroaniline over the In 2S3 photocatalyst was investigated in water under visible light irradiation (λ ≥ 420 nm). After 90 min of visible light irradiation, 100% of 4-nitroaniline could be reduced t
Application of silica-supported Fe–Cu nanoparticles in the selective hydrogenation of p-dinitrobenzene to p-phenylenediamine
Shesterkina,Shuvalova,Kirichenko,Strelkova,Nissenbaum,Kapustin,Kustov
, p. 201 - 204 (2017)
Supported bimetallic Fe–Cu/SiO2 materials are synthesized, and their catalytic activity in hydrogenation of dinitrobenzene to phenylenediamine at 145–180°С and 1.3 MPa hydrogen pressure is studied for the first time. The best results (89% selectivity toward p-phenylenediamine at complete conversion of p-dinitrobenzene) are obtained for the sample synthesized via co-deposition with subsequent calcination at 300°С. The sample contains 7% iron and 3% copper. The formation of separate phases of metal oxides (for the catalysts prepared by impregnation) and mixed bimetallic oxide phases (in case of co-deposition procedure) in calcined samples is revealed via thermoprogrammed reduction with hydrogen.
Preparation and characterization of Ni/mZSM-5 zeolite with a hierarchical pore structure by using KIT-6 as silica template: An efficient bi-functional catalyst for the reduction of nitro aromatic compounds
Mazaheri, Omid,Kalbasi, Roozbeh Javad
, p. 34398 - 34414 (2015)
Ni/mZSM-5 and Ni/H-mZSM-5 were synthesized as hierarchical (micro/meso porous) ZSM-5 zeolites by an indirect template method for the first time. The resulting zeolite materials exhibited significantly enhanced diffusional properties in comparison to purely microporous zeolite materials. The structural and morphological characterization of the prepared catalysts was investigated using XRD, BET, atomic absorption spectroscopy, FT-IR, 27Al-MAS NMR, SEM, TEM, XPS and DRS-UV techniques. These hierarchical zeolites were used as acid-metal bi-functional heterogeneous catalysts for hydride transfer in the reduction of nitro aromatic compounds. In these reactions, NaBH4 was used as a reducing agent. Excellent yields at room temperature and very short reaction times in aqueous media conditions were obtained. Reusability experiments showed the excellent stability of Ni/mZSM-5 and Ni/H-mMZSM-5 and the catalysts could be reused 7 times without much loss of activity in reduction of nitro aromatic compounds. Surprisingly, the acid form of Ni/H-mZSM-5 showed much higher activity than that of Ni/mZSM-5. High yield, short reaction time, green solvent (water), room temperature, no by-product, the easy reusability of catalysts and the low amounts of catalyst required are some of the advantages of these catalysts.
A simple and convenient method for the reduction of nitroarenes
Ravi Kanth,Venkat Reddy,Rama Rao,Maitraie,Narsaiah,Shanthan Rao
, p. 2849 - 2853 (2002)
A variety of nitroarenes such as simple, electron rich and electron poor were reduced on A12O3 support in presence of sodium hydrogen sulphide under microwave condition to give the corresponding aromatic amines in high yields. It is found that the substituents at different positions on nitrobenzene have no influence except 2d on the rate of reaction and yields of product.
Supported polymer magnets with high catalytic performance in the green reduction of nitroaromatic compounds
Safari,Gandomi-Ravandi,Haghighi
, p. 31514 - 31525 (2016)
Magnetic Fe3O4 nanoparticles (MNPs) were prepared by a simple co-precipitation method using molar ratios of Fe2+:Fe3+ = 1:2 in ammonia solution, and subsequently were modified with tetraethyl orthosilicate (TEOS
