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
Nitrolysis of 2,6,8,12-tetraacetyl-4,10-dibenzyl-2,4,6,8,10,12-hexaazatetracyclo[5.5.0.03,11.05,9]dodecane
Kalashnikov,Sysolyatin,Sakovich,Dubkov,Kulagina
, p. 531 - 536 (2017)
Nitrolysis of 2,6,8,12-tetraacetyl-4,10-dibenzyl-2,4,6,8,10,12-hexaazatetracyclo-[5.5.0.03,11.05,9]dodecane results in the substitution of benzyl groups by the nitro groups with the formation of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazatetracyclo[5.5.0.03,11.05,9]-dodecane. The reaction sequentially proceeds through the nitration of the benzyl groups predominantly at para-position, the substitution of one nitrobenzyl group with the nitro group, and the introduction of the second nitro group into the nitrobenzyl fragment. The replacement of the remaining dinitrobenzyl fragment is a more difficult process, which reaches completion only by the end of the nitration. Another reaction product is p-nitrobenzoic acid, which is formed in the secondary reactions. No substitution of a p-nitrobenzoyl group with the nitro group takes place in the nitration of 2,6,8,12-tetraacetyl-4,10-di(p-nitrobenzoyl)-2,4,6,8,10,12-hexaazatetracyclo[5.5.0.03,11.05,9]dodecane under similar conditions.
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.
Conversion of oximes into carbonyl compounds with thalium(III) nitrate supported onto HZSM-5 zeolite under microwave irradiation in solventless system
Heravi, Majid M.,Ghassemzadeh, Mitra
, p. 119 - 123 (2003)
Oximes are oxidatively deprotected by thalium(III) nitrate supported onto HZSM-5 zeolite to the parent carbonyl compounds in high yields upon exposure to microwave irradiation.
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.
Oxidation of benzyl alcohols under mild heterogeneous conditions
Shirini,Zolfigol,Azadbar
, p. 1600 - 1602 (2001)
A combination of iodic acid with ammonium dichromate in the presence of wet SiO2 was used as an efficient oxidizing agent for the transformation of benzyl alcohols to the corresponding aldehydes and ketones in n-hexane or without a solvent at r
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
Magneto-structural properties and reliability of (Mn/Ni/Zn) substituted cobalt-copper ferrite heterogeneous catalyst for selective and efficient oxidation of aryl alcohols
Dhabbe, Rohant,Gaikwad, Pratapsingh,Kakade, Bhalchandra,Kamble, Prakash,Kurane, Rajnikant,Parase, Haridas,Sabale, Sandip
, (2021/09/28)
Herein, M2+ substituted CoCuFe2O4 (M2+ = Mn, Zn, Ni) ferrites have been synthesized using the sol-gel auto combustion method. The structural, morphological and magnetic studies confirm the phase formation of pure magnetic cubic spinel MCoCuFe2O4 (M2+ = Mn, Zn, Ni) ferrites. The substitution with Mn, Ni and Zn does not show large variation in binding energies obtained from XPS of Cu (2p) that specifies identical copper concentration (Cu0.5) and substitution of only cobalt (Co2+) in Mn-F, Ni-F and Zn-F catalysts. Interestingly, MCoCuFe2O4 magnetic catalysts were explored for selective oxidation of a series of substituted benzyl alcohols. Catalyst Mn-F showed 93% conversion of benzyl alcohol while, Ni-F showed 95% conversion of 4-nitrobenzyl alcohol. Whereas, the catalyst Zn-F was showed 96% conversion for 4-methoxybenzyl alcohol. Additionally the results also indicate an efficient separation and recovery of the magnetic catalysts after four successive reuses without any considerable loss in its catalytic activity.
Cu-Mn Bimetallic Complex Immobilized on Magnetic NPs as an Efficient Catalyst for Domino One-Pot Preparation of Benzimidazole and Biginelli Reactions from Alcohols
Nasseri, Mohammad Ali,Rezazadeh, Zinat,Kazemnejadi, Milad,Allahresani, Ali
, p. 1049 - 1067 (2020/09/11)
An efficient magnetically recyclable bimetallic catalyst by anchoring copper and manganese complexes on the Fe3O4 NPs was prepared and named as Fe3O4@Cu-Mn. It was founded as a powerful catalyst for the domino one-pot oxidative benzimidazole and Biginelli reactions from benzyl alcohols as a green protocol in the presence of air, under solvent-free and mild conditions. Fe3O4@Cu-Mn NPs were well characterized by FT-IR, XRD, FE-SEM, TEM, VSM, TGA, EDX, DLS, and ICP analyses. The optimum range of parameters such as time, temperature, amount of catalyst, and solvent were investigated for the domino one-pot benzimidazole and Biginelli reactions to find the optimum reaction conditions. The catalyst was compatible with a variety of benzyl alcohols, which provides favorable products with good to high yields for all of derivatives. Hot filtration and Hg poisoning tests from the nanocatalyst revealed the stability, low metal leaching and heterogeneous nature of the catalyst. To prove the synergistic and cooperative effect of the catalytic system, the various homologues of the catalyst were prepared and then applied to a model reaction separately. Finally, the catalyst could be filtered from the reaction mixture simply, and reused for five consecutive cycles with a minimum loss in catalytic activity and performance. Graphic Abstract: A new magnetically recyclable Cu/Mn bimetallic catalyst has been developed for domino one-pot oxidation-condensation of benzimidazole and Biginelli reactions from alcohols. [Figure not available: see fulltext.]
Preparation method of O-nitrobenzaldehyde
-
Paragraph 0026; 0028-0039, (2021/07/11)
The invention discloses a preparation method of o-nitrobenzaldehyde, wherein the preparation method comprises the following steps: (1) adding o-nitrobenzyl alcohol, a catalyst, a bromide salt and a solvent into a reaction kettle, and uniformly stirring at
