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.]
Preparation method of o-nitrobenzaldehyde
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, (2021/12/07)
The invention relates to the technical field of organic synthesis, in particular to a preparation method of o-nitrobenzaldehyde. The invention provides a preparation method of o-nitrobenzaldehyde, which comprises the following steps: (A) carrying out oxidation reaction on o-nitroethylbenzene to obtain 1-(2-nitrophenyl)ethanol; (B) carrying out oxidation reaction on the 1-(2-nitrophenyl)ethanol to obtain o-nitroacetophenone; (C) carrying out oxidation reaction on the o-nitroacetophenone to obtain the o-nitrobenzaldehyde. According to the preparation method, cheap o-nitroethylbenzene is taken as a raw material, and o-nitrobenzaldehyde is obtained through three steps of oxidation reactions under different conditions. The method is reasonable in route, few in side reaction, high in yield, simple to operate, mild in reaction condition, low in equipment requirement and suitable for large-scale industrial production.