104 results about "Nitrobenzoic acid" patented technology

The invention relates to the technical field of electroplating, in particular to a nickel stripping agent, a preparation method of the nickel stripping agent and a nickel plating layer stripping method. The nickel stripping agent comprises the following raw materials: an oxidizing agent, a complexing agent, a dissolution promoter, a surfactant and a corrosion inhibitor, wherein the mass ratio of the oxidizing agent to the complexing agent to the dissolution promoter to the surfactant to the corrosion inhibitor is (4-15): (3-25): (1-11): (0.01-1): (0.01-5); wherein the oxidizing agent is nitrobenzoic acid; the complexing agent is one or more of 2-amino-2-methyl-1-propyl alcohol, acetylacetone, nitrilotriacetic acid, nitrilotriacetic acid sodium salt, acrylate, sodium gluconate and ethylenediamine hydrochloride; the dissolution promoter is an alcohol ether solvent. According to the nickel stripping agent, the oxidizing agent with relatively low toxicity and a non-toxic or low-toxicity non-volatile complexing system are adopted, nickel can be completely removed, a base material cannot be eroded, and the threat to the health of operators can be remarkably reduced.

The present invention provides a paroxysmal hemoglobinuria indication drug ipropam key intermediate synthesis method, and relates to the technical field of ipropam, the method comprises: taking p-bromobenzaldehyde as an initial raw material, adopting an S-configuration catalyst to obtain an intermediate 03, carrying out protection group removal on the intermediate 03, carrying out automatic ring closing to obtain an intermediate 04, and carrying out post-treatment to obtain the paroxysmal hemoglobinuria indication drug ipropam key intermediate. Reducing the intermediate 04 with sodium borohydride to obtain a single cis-configuration intermediate 05, then carrying out a chiral flip reaction and hydrolysis to remove p-nitrobenzoic acid, then carrying out an etherification reaction with diethyl sulfate to obtain an intermediate 08, reducing amide of the intermediate 08 with sodium borohydride and boron trifluoride diethyl etherate to obtain an intermediate 09, then carrying out an acetylation reaction to protect amino, and finally carrying out a reaction to obtain the chiral cis-configuration intermediate 03. Cuprous cyanide is subjected to a cyanation reaction and a hydrolytic esterification reaction to obtain the ipropam key intermediate TM. The method is low in raw material price, high in chiral control selectivity, easy in reaction condition control and low in equipment requirement, avoids column chromatography and other operations, and is more suitable for industrial production.

The invention discloses a method for synthesizing L-γ-glutamyl-3-carboxyl-4-nitroaniline ammonium salt, and relates to the technical field of organic synthesis. According to the invention, Glupa-C is synthesized by using 5-amino-2-nitrobenzoic acid and 3-nitrophthaloyl-L-glutamic anhydride as starting materials through a condensation reaction and a hydrazinolysis reaction under the catalytic action of a Lewis acid. Compared with traditional alkaline preparation conditions, the use of highly toxic reagents and the safety hazard of explosion during the preparation process are avoided, production risks are reduced, and energy consumption is lowered. In addition, the synthesis method provided by the invention can achieve a total yield of 47.8% and a purity of 99.96% for the product Glupa-C, and is suitable for industrial production.

The invention discloses a micro-fluidic chip system for detecting staphylococcus aureus and escherichia coli and a detection method. The micro-fluidic chip system comprises a micro-fluidic chip, vancomycin modified iron oxide magnetic nano particles (Fe3O4-Van MNPs), silver (at) aure-4-mercaptobenzoic acid-staphylococcus aureus aptamer nano particles (Ag (at) Au-MBA-Apt NPs) and silver (at) aure-5 '5-dithiobis (2-nitrobenzoic acid)-escherichia coli aptamer nano particles (Ag (at) Au-DTNB-Apt NPs), and the micro-fluidic chip system comprises a micro-fluidic chip, a magnetic nano particle (Fe3O4-Van MNPs), a magnetic nano particle (Ag (at) Au-MBA-Apt NPs) and a magnetic nano particle (Ag (at) Au-MBA-Apt NPs), wherein the micro-fluidic chip integrates a magnetic capture unit, a composite structure construction unit and an SERS in-situ detection unit, and the micro-pipeline is provided with a plurality of necks and cylindrical baffles. When the micro-fluidic chip system is used for detecting the staphylococcus aureus and the escherichia coli in the blood, the sensitivity is high, and the limit of detection (LOD) of the staphylococcus aureus and the escherichia coli is as low as 2.01 FU / mL and 3.28 CFU / mL respectively.

A curcumin nanococrystal composition including curcumin, a coformer, and a stabilizer. The coformer may include at least one of 3,5-dinitrobenzoicacid, gentisic acid, phloroglucinol, 4,4-bipyridine, tartaric acid, citric acid, and gallic acid. The curcumin nanococrystal composition has a particle size less than 10 nm, and the curcumin has a water-solubility between 5 mg / ml and 20 mg / ml.

This invention provides a method for preparing and applying a highly insecticidal diamide compound, relating to the chemical and pesticide fields. The method includes: reacting 2-fluoro-3-nitrobenzoic acid with thionyl chloride (a chlorinating agent) and dimethylformamide (a catalyst) to obtain compound A; condensing compound A with 2-trifluoromethyl-4-heptafluoroisopropyl-6-bromoaniline amide to obtain compound B; reducing compound B to obtain compound C; and, during the reaction under a hydrogen atmosphere, determining the reaction temperature and hydrogen flow rate in each hydrogenation reaction zone based on the concentration of compound B; reacting compound C with paraformaldehyde to obtain compound D; chlorinating 3-chloro-4-fluorobenzoic acid with thionyl chloride (a chlorinating agent) and dimethylformamide (a catalyst) to obtain compound E; and amide condensing compound E with compound D to obtain the novel diamide compound of this invention. The diamide compound of this invention exhibits excellent insecticidal effects when used in pesticide compositions.

This invention belongs to the field of environmental chemistry and relates to a method for quantitatively analyzing the concentrations of cystine and cysteine ​​in a mixed solution. Based on the theoretical characteristics of the reaction between the disulfide bond in cystine, a representative amino acid, and the thiol group in cysteine, and persulfate, this invention expands the detection capability of the traditional 5,5-dithio-bis-(2-nitrobenzoic acid) (DTNB), providing support for the quantitative analysis of cystine and cysteine ​​concentrations and the study of their transformation processes.

The present invention relates to a method of adding an isocitrate lyase specific inhibitor to a lactic acid fermentation process to block the production of succinic acid as a byproduct of fermentation. The specific inhibitor includes a combination of one or more of glycolic acid methyl ester, malonic acid dimethyl ester, hydroxymalonic acid diethyl ester, 3-nitropropionic acid ethyl ester, mercuric chloride, or 5,5'-dithiobis(2-nitrobenzoic acid) to effectively reduce the amount of succinic acid in the lactic acid.

The application discloses 4-nitrobenzoic acid imidazole quaternary ammonium salt and a preparation method and application thereof. The 4-nitrobenzoic acid imidazole quaternary ammonium salt provided by the application has a structure as shown in formula (I), is in a single crystal form, is in a triclinic crystal system, and belongs to a P-1 space group. The 4-nitrobenzoic acid imidazole quaternary ammonium salt has a significant bacteriostatic effect, good thermal stability, and can be applied to preparation of antibacterial materials as an antibacterial agent.

This invention belongs to the field of insecticide technology, specifically relating to a diamide compound, its preparation method, intermediate preparation equipment, and applications. The preparation method includes: reacting 2-fluoro-3-nitrobenzoic acid with thionyl chloride in the presence of dimethylformamide to generate compound A; condensing compound A with 2-trifluoromethyl-4-heptafluoroisopropyl-6-bromoaniline amide to obtain compound B; reducing compound B to obtain compound C; substituting compound C with formaldehyde to obtain compound D; and condensing compound D with 3,5-dichloro-4-fluorobenzoyl chloride to obtain the diamide compound. The beneficial effects of this invention are: the diamide compound solves the problem of insecticide resistance and possesses high insecticidal activity, exhibiting good insecticidal effect at low doses. Furthermore, the preparation method uses mild reaction conditions, produces few byproducts, and has a high reaction yield, reducing raw material loss and thus lowering production costs.

The invention discloses a soybean meal quality evaluation method based on protein oxidation, which comprises the following steps: sampling a soybean meal sample, determining the protein carbonyl content of the soybean meal by adopting a 2, 4-dinitrophenylhydrazine (DNPH) method and / or determining the protein carbonyl content of the soybean meal by adopting 5, 4-dinitrophenylhydrazine (DNPH) method. According to the method, the content of free sulfydryl in the soybean meal protein is measured by a 5, 5 '-dithio-2-nitrobenzoic acid (DTNB) method, the oxidation degree of the soybean meal protein is evaluated, the quality of the soybean meal is graded and evaluated, and the evaluation result can be verified by adopting the in-vitro digestibility of the protein. The evaluation method disclosed by the invention is simple and convenient to operate and high in result repeatability, can effectively evaluate the quality of the soybean meal, and can be applied to quality control, storage management and feed formula optimization of the soybean meal.

This utility model relates to the field of nitrobenzoic acid storage technology, and more particularly to a p-nitrobenzoic acid storage tank, including a tank body and a tank cover detachably connected to the upper end of the tank body, as well as a screw and a drive mechanism. One end of the screw is rotatably connected to the inside of the tank body, and a scraping element for scraping the inner wall of the tank body is threadedly connected to the screw. The scraping element is slidably connected to the inner wall of the tank body. The drive mechanism is located on the tank cover and is used to drive the screw to rotate, thereby scraping the inner wall of the tank body by the scraping element. In this utility model, when the tank cover is connected to the tank body, the drive mechanism drives the screw to rotate, and the screw rotation simultaneously drives the scraping element to slide up and down on the inner wall of the tank body, dynamically scraping off the material adhering to the inner wall of the tank body. At this time, the cleaning process in the closed state of the tank body can reduce the damage caused by manual cleaning of the inner wall of the tank body.

The invention relates to the technical field of organic synthesis, in particular to a method for preparing 4-nitro-N-phenylbenzamide by a one-pot process, which comprises the following steps: under the protection of inert gas, adding an inert solvent, p-nitrobenzoic acid and a composite catalyst into a reactor, and heating to dissolve, the composite catalyst comprising NFM and TPPO; slowly adding thionyl chloride into a reaction system for acylation reaction; then slowly adding aniline into the reaction system to carry out condensation reaction; and after the reaction is finished, carrying out post-treatment to obtain the 4-nitro-N-phenylbenzamide. According to the method, one-pot reaction can be realized, and high-risk intermediates do not need to be separated. In the composite catalyst, NFM efficiently catalyzes acylating chlorination, and TPPO stabilizes an acyl chloride intermediate and promotes condensation, so that the reaction is performed efficiently, stably and highly selectively, and the product is high in yield and purity. And the catalyst is easy to recycle, and the process is green, safe, economical and suitable for industrial production.

The invention provides a black direct dye as well as a preparation method and application thereof. The preparation method of the black direct dye disclosed by the invention comprises the following steps: acquiring polyaniline: performing oxidative polymerization on aniline hydrochloride by using an oxidizing agent to obtain polyaniline; obtaining a condensation product: carrying out condensation reaction on polyaniline and p-nitrotoluene o-sulfonic acid and / or 2-methyl-5-nitrobenzoic acid to obtain the condensation product; and a post-treatment step: carrying out post-treatment on the condensation product to obtain the black direct dye. The preparation method of the black direct dye is simple and easy to implement, few in three wastes in the production process and environmentally friendly. The black direct dye prepared by the preparation method is bright in color, good in water solubility, high in dye-uptake and excellent in dyeing performance.

The utility model discloses continuous production equipment for p-nitrobenzoic acid, which belongs to the technical field of continuous production equipment for p-nitrobenzoic acid and comprises an equipment body and a stabilizing seat. Before the equipment body is opened, the threaded rod is promoted to extend into the upper base through the fixing block, the reinforcing plate extends into the clamping groove through continuous extension of the threaded rod, the clamping effect on the equipment body is achieved, and the equipment body is more stable in the operation period; the main gravity block is located in the center of the upper base and plays a basic main stabilizing role, the auxiliary weighting mechanism, the first auxiliary gravity block and the second auxiliary gravity block are arranged, four corners of the upper base and four corners of the lower base are further reinforced in an auxiliary mode, and therefore through a series of weighting, the stabilizing effect on the equipment body in the running period is achieved, and the stability of the equipment body is improved. And therefore, the production effect of the equipment body is improved, and the production efficiency of the equipment body is improved.

This invention relates to the field of lithium-ion battery technology, and in particular to a positive electrode lithium replenishment agent, its preparation method, and a positive electrode sheet, comprising lithium-rich lithium iron phosphate and lithium nitrobenzene. The positive electrode lithium replenishment agent provided by this invention uses LFO as the main lithium source and combines it with lithium nitrobenzene to form a protective layer in situ on the surface of lithium-rich lithium iron phosphate particles, reducing interfacial side reactions and gas generation, achieving efficient active lithium compensation, and thus improving the overall performance of the battery.

The application provides a preparation method of bumetanide, taking p-chlorobenzoic acid as a starting material, performing chlorosulfonation, nitration, and ammonolysis to obtain a key intermediate of 3-(N-(tert-butyl) sulfamoyl)-4-chloro-5-nitrobenzoic acid, then performing phenoxylation, nitro reduction, n-butylation, and tert-butyl removal, and finally obtaining the bumetanide. Compared with the synthesis process of the prior art, the method has less side reactions, low cost, high yield, high safety, and is beneficial to industrial production.

The invention belongs to the technical field of biological pharmacy, and particularly relates to olpicopone and a preparation method thereof.The preparation method comprises the following steps that 2, 5-dichloro-4, 6-dimethyl nicotinonitrile is oxidized and then subjected to an addition reaction with hydroxylamine, and a compound 2 is obtained; carrying out condensation reaction on the compound 2 and 3-methoxy-4-hydroxy-5-nitrobenzoic acid to obtain a compound 3; and the compound 3 is subjected to methoxy removal to obtain the final product opiapone. The method provided by the invention avoids the problem that excessive intermediate products are left and are not easy to remove in the oxidation step, and avoids yield loss caused by multiple refinement at the same time.

The invention provides a preparation method of 2, 6-diaminobenzene, and relates to the technical field of organic synthesis. The preparation method comprises the following steps: taking 2-amino-4-nitrobenzoic acid as an initial raw material, carrying out diazotization reaction on the initial raw material and nitrite ester under an acidic condition, then carrying out cyclization reaction, and reducing by using a reducing agent to obtain the 2, 6-diaminobenzene. The preparation method provided by the invention is short in reaction route, high in atom conversion rate, high in product yield, high in production efficiency, simple to operate, cheap and easily available in raw material 2-amino-4-nitrobenzoic acid, low in production cost, green and environment-friendly, and suitable for industrial production. The preparation method provided by the invention has important significance on organic synthesis, medicinal chemistry and material chemistry of the biphenyl alkene derivative. The test result of the embodiment shows that the total yield of the 2, 6-diaminobenzene prepared by the preparation method provided by the invention is more than 43.9%.

The invention discloses a strongly-bundled high-insulation glass fiber cloth and a preparation method thereof, and relates to the technical field of glass fiber cloth preparation, the glass fiber cloth is obtained by dipping a fiber cloth obtained by crushing, melting, drawing, yarn preparation, sizing and weaving of a glass raw material in a surface treating agent, after the yarn is subjected to sizing treatment, the strong bundling property meets the requirement, and the surface treating agent is obtained by mixing waterborne polyurethane emulsion prepared from functional diisocyanate and the like with a reinforcing agent and the like. The functional diisocyanate is obtained by carrying out a reaction on 1, 3-dihydroxyethyl adamantane, 3-amino-5-nitrobenzoic acid methyl ester, 4-amino-3-methyl benzonitrile, oleanolic acid and the like; the reinforcing agent is obtained by loading a product e containing aza-adamantane, phosphamide, cyano, hydroxyl and castor oil-based alkane long chains on halloysite nanotubes. The glass fiber cloth disclosed by the invention has relatively high insulativity, mechanical strength, high temperature resistance and flame retardance.

This invention belongs to the field of organic chemical synthesis technology, specifically relating to a method for synthesizing 2-fluoro-3-aminobenzoic acid, an important chemical intermediate. Specifically, o-nitroaniline is condensed with hydrated trichloroacetaldehyde and hydroxylamine hydrochloride to obtain 2-(hydroxyimino)-N-(2-nitrophenyl)acetamide; the resulting product undergoes an intramolecular Beckmann rearrangement to generate 7-nitroindigo; 7-nitroindigo undergoes Bayer-Villedge oxidation to generate 2-amino-3-nitrobenzoic acid; 2-amino-3-nitrobenzoic acid undergoes diazotization and halogenation reactions to generate 2-fluoro-3-nitrobenzoic acid or 2-chloro-3-nitrobenzoic acid; 2-fluoro-3-nitrobenzoic acid can be further reduced by nitro to obtain 2-fluoro-3-aminobenzoic acid; or, 2-chloro-3-nitrobenzoic acid can be esterified to obtain 2-chloro-3-nitrobenzoic acid ester, which can then be fluorinated, saponified, and reduced to obtain 2-fluoro-3-aminobenzoic acid. The raw materials of this invention are low in cost and readily available, and the entire reaction route has specific regioselectivity, making it suitable for industrial production.

The application relates to the technical field of organic synthesis, in particular to a method for preparing 4-nitro-N-phenyl benzamide through one-pot reaction, and the preparation method is as follows: under the protection of inert gas, inert solvent, p-nitrobenzoic acid and a composite catalyst are added into a reactor and heated and dissolved, wherein the composite catalyst comprises NFM and TPPO; a small amount of thionyl chloride is slowly added into the reaction system to perform acylation reaction; then, aniline is slowly added into the reaction system to perform condensation reaction; after the reaction is completed, 4-nitro-N-phenyl benzamide is obtained through post-treatment. The method can realize one-pot reaction, and a high-risk intermediate does not need to be separated. NFM in the composite catalyst can efficiently catalyze acyl chloride, TPPO can stabilize the acyl chloride intermediate and promote condensation, so that the reaction is efficiently, stably and highly selectively performed, the product has high yield and high purity. Moreover, the catalyst is easy to recycle and use, the process is green, safe and economical, and is suitable for industrial production.

The invention discloses a Cu substrate growing ZIF-8 material and a preparation method and application thereof.The preparation method includes the steps that the material is synthesized at the mild room temperature, a high-added-value chemical is obtained at a cathode, p-nitrobenzoic acid can be electrically reduced into p-aminobenzoic acid at the low potential, the Faraday efficiency reaches up to 996% or above, and the material can be recycled for 6 times or above; the stability is good, and large-scale preparation and the yield of gram level or above can be realized. The catalyst material disclosed by the invention is simple and feasible in preparation process, economical, environment-friendly and easy to treat, and has a wide market application prospect in the fields of industrial electro-catalytic organic synthesis and new energy.

The invention belongs to the technical field of nano materials, and discloses a preparation method of a high-stability strong-chlorine-resistance MOF-based seawater electrolysis catalyst. The preparation method comprises the following steps: (1) treating product substrate foamed nickel; (2) preparing a synthetic material from ferric salt, nickel salt, p-toluic acid, p-nitrobenzoic acid, water, ethanol and N, N-dimethylformamide; and (3) synthesizing the final nitro functionalized NiFe-MOF-PNBA (at) NF through a hydrothermal method. When the electrocatalytic material is applied to an alkaline real seawater oxygen evolution reaction, the catalytic performance is better, and higher operation stability can be kept under high current density. In addition, the prepared catalyst also shows excellent electrolytic stability, and the stability can be maintained for more than 4000 hours under the current density of 1.5 A / cm < 2 >.

The invention belongs to the field of high-frequency communication materials, and particularly discloses a Low-alpha ray spherical alumina / liquid crystal polymer 5G base station substrate material, which is characterized by comprising a liquid crystal copolymer matrix and a Ce < 3 + > doped spherical alumina filler, the liquid crystal copolymer matrix is prepared from three comonomers, namely 60 to 68 mol percent of p-hydroxybenzoic acid, 20 to 24 mol percent of 5, 5 '-dithiobis (2-nitrobenzoic acid) and 12 to 16 mol percent of 4-(5-amino-6-hydroxy-2-benzoxazole)-benzoic acid; the surface of the Ce < 3 + >-doped spherical alumina filler is sequentially coated with a Bi2Te3-xSex topological insulating layer and a phosphate silane grafting layer, wherein x is equal to 0.12-0.18. According to the Low-alpha ray spherical aluminum oxide / liquid crystal polymer 5G base station substrate material, the alpha ray shielding rate is larger than or equal to 99.95%, the heat conductivity is larger than or equal to 3.35 W / mK, the dielectric loss factor tan delta is smaller than 0.00014 under 28 GHz, and the strict requirements for high frequency, high reliability and the like of a substrate in 5G millimeter wave antenna application can be met.

The invention discloses a high and low temperature resistant coal-pitch-containing asphalt mixture and a preparation method thereof, and relates to the field of asphalt mixtures, the high and low temperature resistant coal-pitch-containing asphalt mixture comprises the following raw materials by weight: 20-25 parts of modified coal pitch, 40-45 parts of gravel, 10-15 parts of an auxiliary agent, and 8-10 parts of mineral powder. The modified coal pitch is obtained by modifying coal pitch through modified SBS (styrene butadiene styrene), and the modified SBS is obtained by grafting SBS and a reaction product of 5-amino-2-hydroxycycloheptyl-2, 4, 6-triene-1-ketone, 3-hydroxy-5-nitrothiophene-2-carboxylic acid methyl ester, 4-acetyl-3-nitrobenzoic acid methyl ester and the like. The auxiliary agent is an epoxy group-containing expanded graphite-glass fiber grafted product obtained by reaction of expanded graphite, glass fiber and the like. And the modified coal pitch and the auxiliary agent are combined for use, so that the interface bonding force between the modified coal pitch and the glass fibers and the expanded graphite is enhanced, and the asphalt mixture is endowed with relatively strong high and low temperature resistance, flame retardance, smoke suppression and aging resistance.

The application discloses a preparation method of 2-acetylamino-4-[(2-hydroxyethyl)sulfonyl]benzoic acid. The 2-acetylamino-4-[(2-hydroxyethyl)sulfonyl]benzoic acid is prepared from 4-fluoro-2-nitrobenzoic acid methyl ester as a starting material through aromatic nucleophilic substitution reaction, nitro reduction reaction, ester hydrolysis reaction, amino acylation reaction, thioether oxidation reaction and the like. The method has the advantages of mild reaction condition, high yield, low cost, easy availability of raw materials, and the like. The synthesis process meets the requirements of green chemistry, the synthesis route is innovative, the reaction post-treatment is simple, and the product is easy to purify.

The utility model relates to the technical field of p-nitrobenzoic acid production, in particular to a p-nitrobenzoic acid production filtering device which comprises a sealable suction filtration container, the interior of the suction filtration container is divided into a filtering cavity located on the upper portion and a liquid storage cavity located on the lower portion, and a filtering layer is arranged in the filtering cavity. The suction filtration container is further connected with a vacuum pump through an exhaust pipe, the vacuum pump is used for forming a negative pressure environment in the suction filtration container, the pulse type negative pressure adjusting assembly comprises a first electromagnetic valve, a controller and a timer, the first electromagnetic valve is arranged on the exhaust pipe, and the controller is electrically connected with the first electromagnetic valve. According to the utility model, the pulse type negative pressure adjusting component is used for exhausting air, and the air is fed when the air exhausting is stopped, so that periodic negative pressure and positive pressure alternately act on the filter cake, periodic strain is generated in the filter cake, a compact layer on the surface of the filter cake generates microcracks due to repeated stress, and the filtrate permeability is improved.

The present application relates to the technical field of p-nitrobenzoic acid production, and discloses an automatic feeding device for p-nitrobenzoic acid production, which comprises a storage tank, a quantitative discharging assembly and a material conveying assembly; the bottom of the storage tank is provided with a discharging port; the quantitative discharging assembly comprises a butterfly valve one, a butterfly valve two, a quantitative pipe and a weighing sensor, the upper and lower ends of the butterfly valve one are fixedly connected with the discharging port and the quantitative pipe respectively, the quantitative pipe is fixedly connected with the butterfly valve two, and the weighing sensor is arranged on the upper surface of the butterfly plate two in the butterfly valve two and used for weighing the material in the quantitative pipe; the material conveying assembly comprises a nitrogen source, a feeding pipe and a discharging pipe, the two ends of the feeding pipe are fixedly connected with the nitrogen source and the discharging pipe respectively, the top of the feeding pipe is provided with a feeding pipe, and the side of the discharging pipe is provided with an air flow disturbance assembly, which is used for blowing the material in the discharging pipe to adjust the discharging speed and state of the material. The present application can more accurately and stably quantitatively discharge the material, and improves the product quality.

The present invention relates to a process for preparing p-nitrobenzoic acid-2-ethyl hexylester comprising reacting p-nitrobenzoic acid, wherein an excess of 2-ethylhexanol acts as solvent and no additional solvent is added, or p-nitrobenzoic acid and 2-ethylhexanol are provided in equimolar amounts and no additional solvent is added, or 2-ethylhexanol is provided in substoichiometric amounts and no additional solvent is added. Further, the present invention relates to the p-nitrobenzoic acid-2-ethyl hexylester obtained by the process and having high purity and optimum product properties.