529-23-7Relevant articles and documents
Regioselectivity of Friedlaender quinoline syntheses
Diedrich, Claas Lueder,Haase, Detlev,Saak, Wolfgang,Christoffers, Jens
, p. 1811 - 1816 (2008)
Optically active, bicyclic ketones were submitted to Friedlaender quinoline syntheses with 2-aminobenzaldehyde to yield regioisomeric linear or angular products. When starting from trans-configured ketones, the linear products are the major isomers (ratio
Tailored routes for home-made Bi-doped ZnO nanoparticles. Photocatalytic performances towards o-toluidine, a toxic water pollutant
Mostoni,Pifferi,Falciola,Meroni,Pargoletti,Davoli,Cappelletti
, p. 534 - 545 (2017)
Herein we report the photodegradation of highly toxic o-toluidine in aqueous media (under UV irradiation), by using home-made bare and bismuth-doped ZnO nanoparticles. The latter powder was prepared by both a traditional impregnation method and by an innovative sol-gel synthesis, obtained using bismuth nitrate as precursor. Moreover, synthetic conditions (such as zinc salts and medium acidity) were varied in order to obtain different semiconductor nanopowders with diverse physico-chemical properties and, hence, photocatalytic performances. Both the disappearance and the mineralization of the pollutant molecule were followed by Linear Sweep Voltammetry and Total Organic Carbon techniques, respectively. Photocatalysis by-products were then identified by HPLC–MS (on eluates, after 3 h and 6 h) and ATR-FTIR (on used nanopowders) analyses. Thus, a new photodegradation pathway (with azo dimer derivatives in the first step) has been proposed. Bi-impregnated samples show high degree of mineralization, reducing the stability of the intermediates.
Non-covalent aggregation of discrete metallo-supramolecular helicates into higher assemblies by aromatic pathways: Structural and chemical studies of new aniline-based neutral metal(II) dihelicates
Vazquez, Miguel,Bermejo, Manuel R.,Licchelli, Maurizio,Gonzalez-Noya, Ana M.,Pedrido, Rosa M.,Sangregorio, Claudio,Sorace, Lorenzo,Garcia-Deibe, Ana M.,Sanmartin
, p. 3479 - 3490 (2005)
Neutral manganese(II), iron(II), cobalt(II), nickel(II), zinc(II) and cadmium(II) complexes with an N-tosyl-substituted N4-donor Schiff base containing a 4,4′-methylenedianiline residue as spacer [H 2La: N,N′-bis(2-tosylaminobenzylidene)-4,4′- methylenedianiline], and the zinc(II) complex with an analogous ligand [H 2Lb: N,N′-bis(2-tosylaminobenzylidene)-4,4′- oxodianiline] have been prepared by an electrochemical procedure. FAB and ESI mass spectra of the complexes show peaks due to species corresponding to a general formula [M2(La,b)2 + H]+, thereby suggesting their dinuclear nature. A detailed study of the crystal packing in the unit cell of the zinc(II) complex with H2La shows that the helicates aggregate to form discrete prismatic moieties containing three molecules held together by π-π and σ-π interactions. Moreover, the ZnII neutral dihelicate with H 2Lb forms a 3D network in the solid state due to intermolecular π-stacking interactions. 1H NMR studies of the diamagnetic compounds reported herein have been performed. Finally, the ligand H2La and its ZnII and CdII complexes have been studied by spectrophotometric and spectrofluorimetric techniques in order to get a better understanding of the formation mechanisms of the complexes and of the nature of their fluorescence emission. Emission studies show that the ZnII and CdII dihelicates with H2L a display a green fluorescence in acetonitrile solution (λ = 473 nm, Φ = 0.03 and λ = 476 nm, Φ = 0.01, respectively). Wiley-VCH Verlag GmbH & Co. KGaA 2005.
Synthesis, characterization, and application of a manganese Schiff base complex containing salicylaldehyde-poly(vinylamine)/SBA-15 as a novel heterogeneous hybrid catalyst
Massah, Ahmad Reza,Kalbasi, Roozbeh Javad,Kaviyani, Somayeh
, p. 12816 - 12825 (2013)
A manganese Schiff base complex containing salicylaldehyde-poly(vinylamine) /SBA-15 (Mn-SA-PVAm/SBA-15) composite was prepared as a novel heterogeneous catalyst through in situ polymerization of vinylamine within the nano-channels of mesoporous silica SBA-15 without using any organo silica precursors. The catalyst was characterized well by elemental analysis, FT-IR, AAS, DRS UV-Vis, XRD, BET, SEM and TGA techniques. The catalytic activity of the supported metal complex was studied in the selective oxidation of benzyl alcohols using t-butyl hydroperoxide as an oxidant. The effects of reaction temperature, solvent and the amount of catalyst as well as the recyclability of the catalyst were investigated. The Royal Society of Chemistry 2013.
Fe3O(OAc)6(Py)3 Mediated Reduction of Aromatic Nitro Compounds with 2-Mercaptoethanol
Murata, Satoru,Miura, Masahiro,Nomura, Masakatsu
, p. 361 - 362 (1988)
Aromatic nitro compounds were selectively reduced by 2-mercaptoethanol in the presence of Fe3O(OAc)6(Py)3 to give the corresponding amines in good yields.
Iron(III) Nitrate/TEMPO-Catalyzed Aerobic Alcohol Oxidation: Distinguishing between Serial versus Integrated Redox Cooperativity
Mao, Kaining,Nutting, Jordan E.,Stahl, Shannon S.
supporting information, p. 10565 - 10570 (2021/07/28)
Aerobic alcohol oxidations catalyzed by transition metal salts and aminoxyls are prominent examples of cooperative catalysis. Cu/aminoxyl catalysts have been studied previously and feature "integrated cooperativity", in which CuII and the aminoxyl participate together to mediate alcohol oxidation. Here we investigate a complementary Fe/aminoxyl catalyst system and provide evidence for "serial cooperativity", involving a redox cascade wherein the alcohol is oxidized by an in situ-generated oxoammonium species, which is directly detected in the catalytic reaction mixture by cyclic step chronoamperometry. The mechanistic difference between the Cu- and Fe-based catalysts arises from the use iron(III) nitrate, which initiates a NOx-based redox cycle for oxidation of aminoxyl/hydroxylamine to oxoammonium. The different mechanisms for the Cu- and Fe-based catalyst systems are manifested in different alcohol oxidation chemoselectivity and functional group compatibility.
Mild and efficient copper-catalyzed oxidative cyclization of oximes with 2-aminobenzyl alcohols at room temperature: synthesis of polysubstituted quinolines
Liu, Yan-Yun,Wei, Yang,Huang, Zhi-Hui,Liu, Yilin
supporting information, p. 659 - 666 (2021/02/06)
A simple and efficient ligand-free Cu-catalyzed protocol for the synthesis of polysubstituted quinolinesviaoxidative cyclization of oxime acetates with 2-aminobenzyl alcohols at room temperature has been developed. The presented approach provides a new synthetic pathway leading to polysubstituted quinolines with good functional group tolerance under mild conditions. Moreover, this transformation can be applied for the preparation of quinolines on a gram scale. Oxime acetates serve as the internal oxidants in the reactions, thus making this method very attractive.
