552-89-6Relevant articles and documents
Synthesis of bimagnetic ionic liquid and application for selective aerobic oxidation of aromatic alcohols under mild conditions
Miao, Cheng-Xia,Wang, Jin-Quan,Yu, Bing,Cheng, Wei-Guo,Sun, Jian,Chanfreau, Sebastien,He, Liang-Nian,Zhang, Suo-Jiang
, p. 2697 - 2699 (2011)
The first bimagnetic ionic liquid based on Fe and TEMPO with cooperative functionalities not only exhibited strong paramagnetic behaviour at room temperature under an applied magnetic field of 5000 Oe but also proved to be an effective catalyst for select
Continuous flow nitration of benzaldehyde
Kulkarni, Amol A.,Kalyani, Vishwanath S.,Joshi, Ramesh A.,Joshi, Rohini R.
, p. 999 - 1002 (2009)
The nitration of benzaldehyde can be carried out in a safe manner in continuous mode using a microreactor system. Choice of a micromixer was seen to affect the performance of this two-phase reaction significantly. The reaction time could be brought down to 2 min by increasing the reaction temperature and thereby taking advantage of higher heat transfer area. The simple T-micromixer is seen to be inefficient for two-phase reactions. Further scope of process intensification is also discussed.
Kinetics and Thermodynamics of Restricted Rotation of the Formyl Group in Nitrobenzaldehyde Anion Radicals
Branca, Mario,Gamba, Aldo,Barzaghi, Mario,Simonetta, Massimo
, p. 6506 - 6515 (1982)
The barrier to rotation about the carbonyl carbon-phenyl carbon bond of 3-nitrobenzaldehyde anion radical in N,N-dimethylformamide solution has been determined by a detailed line-shape analysis of the corresponding electron paramagnetic resonance (EPR) spectra at different temperatures.At 25 deg C the cis conformation is favored by 0.98 kcal mol-1 in free energy, and the free-energy barrier to the cis-trans conversion amounts to 9.35 kcal mol-1.Both enthalpy and entropy contributions to the free-energy profile are accurately evaluated (ΔH = 3.91, ΔH0 = -1.13 kcal mol-1; ΔS = -18.2, ΔS0 = -7.1 cal mol-1 K-1).The effects of ionic association and solvation on the barrier are discussed.The EPR spectra of 4-nitrobenzaldehyde and 2-nitrobenzaldehyde anion radicals are also reported as a function of temperature.In these cases, the barriers to internal rotation are too high to be surmounted on the EPR time scale.STO-3G ab initio MO calculations are given for benzaldehyde, 3-nitrobenzaldehyde, 4-nitrobenzaldehyde, and the corresponding anion radicals.The spin distribution in the anion radicals is calculated by McLachlan and INDO methods.
Facile open air oxidation of benzylic alcohols in distilled water by in situ made copper(II) complexes
Ahmad, Jahir Uddin,R?is?nen, Minna T.,Kemell, Marianna,Heikkil?, Mikko J.,Leskel?, Markku,Repo, Timo
, p. 153 - 162 (2012)
A highly efficient, selective and green catalytic protocol for open air oxidation of primary benzylic alcohols into aldehydes by in situ made N-isopropyl-3,5-di-tert-butylsalicylaldimine (HL3)-Cu(II) complexes and TEMPO (2,2,6,6-tetramethyl-piperidinyloxy
SBA-15 Supported Silver Catalyst for the Efficient Aerobic Oxidation of Toluene Under Solvent-Free Conditions
Chen, Lei,Chen, Yanjiao,Dai, Xuan,Guo, Jiaming,Peng, Xinhua
, (2021/12/09)
The efficient SBA-15 supported silver catalysts(Ag/SBA-15) were prepared and characterized by ICP-OES, XRD, TEM, SEM, XPS and N2 adsorption–desorption techniques. The catalysts exhibited an excellent catalytic activity for the aerobic oxidation of toluene to benzaldehyde under solvent-free conditions. Conversion of toluene and selectivity of benzaldehyde were 50% and 89% respectively over catalyst with 9.1 wt% Ag loading (10Ag/SBA-15). A wide range of substrates were tolerated under the selected reaction conditions. The kinetic study shows that the oxidation of toluene over 10Ag/SBA-15 is pseudo-first-order reaction and the activation energy Ea is 45.1?kJ/mol. A plausible mechanism involving oxygen free radicals was proposed for the aerobic oxidation reaction. Compared with the traditional method, the newly designed heterogeneous catalytic system shows better economic applicability, environmental friendliness and broader application prospects. Graphical abstract: [Figure not available: see fulltext.]
The: In situ fabrication of ZIF-67 on titania-coated magnetic nanoparticles: A new platform for the immobilization of Pd(ii) with enhanced catalytic activity for organic transformations
Kaur, Manpreet,Paul, Satya,Sharma, Chandan,Sharma, Sukanya
, p. 20309 - 20322 (2021/11/22)
Considering the outstanding characteristics of metal organic frameworks (MOFs) and magnetic nanoparticles, herein we report a facile approach for the synthesis of a magnetic zeolitic-imidazolate-framework-supported palladium(ii) catalyst. In brief, zeolitic imidazolate framework-67 (ZIF-67) was successfully incorporated onto the surface of titania-coated magnetic nanoparticles using ethane-1,2-diamine as a linker, and then Pd(ii) was immobilized onto this. The resulting Pd@ZIF-67-Fe3O4-TiO2 catalyst possesses a high surface area (205 m2 g-1), a large pore volume (0.10 cm3 g-1), good magnetic responsivity (10.71 emu g-1), and high stability. A comparative analysis of Pd@ZIF-67-Fe3O4-TiO2 and Pd@Fe3O4-TiO2 catalysts for the oxidation, reduction, and oxidative deprotection of oximes was done to investigate the effects of ZIF-67 on the catalytic performance of Pd species. Substantial differences in activity and stability were observed in the presence of ZIF-67, suggesting that ZIF-67 plays an important role in enhancing the activity of Pd(ii). This superior catalytic activity and stability arises due to a synergistic effect between well-dispersed palladium species and highly porous ZIF-67, which was confirmed via XPS analysis. Moreover, the catalyst retains its structure, chemical environment, and good magnetic response even after five catalytic runs, as confirmed via FTIR, XRD, XPS, and VSM studies of reused catalyst samples.