- Preparation method of 3 -methyl -4 - nitrobenzoic acid
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The preparation method of 3 -methyl -4 -nitrobenzoic acid takes 2, 4 -dimethylnitrobenzene as a starting raw material and selectively oxidizes 4-position methyl to generate 3 - methyl -4 - nitrobenzoic acid. The reaction 30 °C is carried out at 5 hours, the reaction is finished after the reaction is finished, the solvent acetonitrile is recovered by rotary evaporation of the filtrate, and the mixture is filtered to obtain 3 - methyl -4 - nitrobenzoic acid, 2, 4 -dimethylnitrobenzene conversion rate ≥ 98% and 3 - methyl -4 - nitrobenzoic acid yield of 65%. The method is mild in condition, stable in reaction, stable in quality, simple in process and convenient to operate.
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Paragraph 0013-0014
(2021/10/11)
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- Combined production method for substituted benzaldehyde, substituted benzyl alcohol and substituted benzoic acid
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The invention discloses a combined production method for substituted benzaldehyde, substituted benzyl alcohol and substituted benzoic acid. The method comprises the following steps: (1) oxidation: a step of continuously introducing substituted toluene, a catalyst and oxygen-contained gas into an oxidation reactor and carrying out reaction so as to obtain oxidation reaction liquid; (2) hydrolyzation: a step of allowing the oxidation reaction liquid to continuously enter a hydrolysis reactor, and continuously adding water into the hydrolysis reactor and carrying out reaction so as to obtain a hydrolysis reaction mixture; (3) liquid-liquid layering: a step of layering the hydrolysis reaction mixture so as to obtain an oil phase and an aqueous phase; and (4) separation of products: a step of subjecting the oil phase to distillation so as to respectively obtain incompletely-reacted substituted toluene, substituted benzyl alcohol and substituted benzaldehyde, and subjecting the aqueous phase to cooling, crystallizing and filtering so as to obtain filtrate and substituted benzoic acid. The combined production method provided by the invention has the advantages of high raw material conversion rate, few by-products, good selectivity of target products, greenness and environmental protection.
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Paragraph 0079; 0080
(2017/01/31)
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- Synthesis method for 3-formyl-4-methyl nitrobenzoate
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The invention relates to a synthesis method for a compound, in particular to a synthesis method for 3-formyl-4-methyl nitrobenzoate.According to synthesis method, a simple and cheap preparation method for 3-formyl-4-methyl nitrobenzoate is supplied, the reaction conditions in the preparation process are mild, and the yield is high.
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Paragraph 0003; 0006
(2016/10/27)
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- An "ortho effect" in electrophilic aromatic nitrations: Theoretical analysis and experimental validation
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Usually, a π-donor substituent acts as an ortho/para directing group in an electrophilic aromatic substitution reaction, and a π-acceptor substituent acts as a meta directing group. Interestingly, when a π-acceptor substituent is meta to a π-donor substituent, certain electrophilic aromatic nitration occurs ortho to the π-acceptor substituent rather than para . The "ortho effect", highlighted in various textbooks, has been tentatively analyzed here based on ab initio calculations. The reliability of the calculations was verified by the corresponding experimental data, including a newly-designed electrophilic aromatic nitration that also gave reasonable product distributions.
- Li, Hui-Jing,Wu, Yan-Chao,Dai, Jian-Hong,Song, Yan,Cheng, Runjiao,Qiao, Yuanyuan
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p. 1307 - 1312
(2015/02/05)
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- Regioselectivity nitration of aromatics with N2O5 in PEG-based dicationic ionic liquid
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Regioselective mononitration of simple aromatic compounds has been investigated with N2O5 as nitrating agent and a new PEG200-based dicationic acidic ionic liquid (PEG200-DAIL) as catalyst. The results of experiments show that this nitration system can significantly improve the para-selectivity of alkyl-benzenes and the ortho-selectivity of halogenated-benzenes. The PEG200-DAIL exhibits recyclable temperature-dependant phase behavior in CCl4 solvent, and it can be recycled without apparent loss of catalytic activity, and only 5% loss of weight is observed after six times recycling.
- Wang, Peng-Cheng,Lu, Ming
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supporting information; experimental part
p. 1452 - 1455
(2011/05/16)
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- Aromatic nitration using nitroguanidine and EGDN
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Acid catalyzed nitration has been examined using a variety of novel nitration agents: guanidine nitrate (GN) and nitroguanidine (NQ) as well as the simple nitrate ester, ethylene glycol dinitrate (EGDN). Reactions with either activated or deactivated aromatic substrates proceed rapidly and in high yield. Regioselectivity was similar for all nitrating agents examined. The synthetic advantages of liquid EGDN include high solubility in organic solvents, strong nitration activity and ease of preparation.
- Oxley, Jimmie C.,Smith, James L.,Moran, Jesse S.,Canino, Jonathan N.,Almog, Joseph
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p. 4449 - 4451
(2008/12/21)
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- Regio- and chemoselective enzymatic N-oxygenation in vivo, in vitro, and in flow
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(Chemical Equation Presented) Action by the para: Evaluation of the nitro-group-forming N-oxygenase AurF in vivo, in vitro, and immobilized as a fusion protein with simply H2O2 as oxidant (peroxide shunt) reveals para-regioselective oxygenation of aromatic amines (see scheme). This effect includes the selective oxygenation of diamino compounds.
- Winkler, Robert,Richter, Martin E. A.,Knuepfer, Uwe,Merten, Dirk,Hertweck, Christian
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p. 8016 - 8018
(2007/10/03)
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- Urea nitrate and nitrourea: powerful and regioselective aromatic nitration agents
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Urea nitrate (UN) and nitrourea (NU), easily prepared from urea and nitric acid, convert deactivated aromatic compounds to the corresponding nitrated derivatives with a high yield and a high regioselectivity under very mild conditions. The performance of the two reagents is quite similar indicating that NU is an intermediate in the UN nitration process.
- Almog, Joseph,Klein, Asne,Sokol, Anat,Sasson, Yoel,Sonenfeld, Dana,Tamiri, Tsippy
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p. 8651 - 8652
(2007/10/03)
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- A rapid synthesis of 2-aryl-5-substituted-2,3-dihydrobenzofurans
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(Chemical Equation Presented) An effective strategy has been developed for the rapid and efficient one-pot synthesis of 2-aryl-5-substituted-2,3- dihydrobenzofurans from readily available o-nitrotoluenes and aromatic aldehydes. This strategy allows access to a structurally diverse array of products for further manipulation.
- Kuethe, Jeffrey T.,Wong, Audrey,Journet, Michel,Davies, Ian W.
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p. 3727 - 3729
(2007/10/03)
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