57 results about "Ortho-aminophenol" patented technology

The invention relates to a dibenzoxazine containing an oxazole ring and a preparation method thereof. The preparation method comprises the following two steps of: 1: mixing ortho-aminophenol hydrochloride and para-hydroxybenzoic acid, adding polyphosphoric acid as a solvent, reacting at 60-180 DEG C for 24-60 hours, and washing by using deionized water, filtering and drying to obtain diphenol containing an oxazole ring structure; and 2: mixing the diphenol containing the oxazole ring structure, phenylamine and paraformaldehyde, reacting at 80-110 DEG C for 40-80 minutes, then filtering and precipitating, washing 4-8 times by using alkali liquor, and then washing, filtering and drying to obtain the product. The dibenzoxazine disclosed by the invention has the advantages of very good mechanical property because the high temperature resistant oxazole ring structure is introduced to a benzoxazine molecule structure, dielectric constant of only 1.6-2.3, simple process, lower equipment requirement and suitability for large-scale production.

The invention relates to a process for preparing monoazo 2:1 chrome complex dye comprising, reacting one or more categories of aromatic ortho-aminophenol with sodium nitrite in water solution of hydrochloric acid or sulfuric acid, subjecting the reacted mixture to coupling reaction with B-naphthol queous alkali, filtering and drying the coupling product, reacting with trivalent chromium salt in organic solvent at the presence of acid-binding agent. The process according to the invention can be applied in particular to the preparation of color-developing agent for ink-ejecting ink, as well as the coloring charge modifier during the photoelectric image formation process.

The invention discloses an aluminium ion fluorescent probe, which is a Schiff base compound made from 2-hydroxyl-1-naphthaldehyde and ortho-aminophenol through a condensation reaction. The fluorescent probe itself is good in chemical and optical stability, has fluorescence-enhanced specific response to aluminium ions, has the detection limit reach a nanomole level, is not interfered by other ions, and can fast response. The aluminium ion concentration in a range of 0.05-0.25 [mu]M and the fluorescence intensity of the prove show a good linear relation, and the probe is not interfered by other anions.

The invention relates to an ortho-aminophenol wastewater treatment method which effectively solves the problems of treatment for ortho-aminophenol wastewater and implementation of wastewater recovery. The method comprises the following steps: filtering the ortho-aminophenol wastewater, and regulating the pH value to 6-8; preparing a composite extractant from bis(2-ethylhexyl) phosphate, tri(octyl-deca)alkyl tertiary amine and a diluter, sending the composite extractant and ortho-aminophenol wastewater into a cyclone floatation extraction apparatus, introducing air or nitrogen, reacting for 0.3-1.5 hours, transferring the ortho-aminophenol from the wastewater phase into the oil phase, sending the wastewater into an ozone reaction tower, and adding H2SO4 or HCl into the cyclone floatation extraction apparatus, wherein the composite extractant in the cyclone floatation extraction apparatus is regenerated and recovered by utilizing the H2SO4 or HCl; and introducing ozone from the bottom of the ozone reaction tower, adding a catalyst into the wastewater to remove the residual micromolecule organic pollutants, and directly recovering the wastewater. The method is simple to operate, has the advantages of low cost, favorable effect and high recovery rate of ortho-aminophenol (up to 99% above), improves the environment and saves the resources.

The invention discloses an ortho-aminophenol Schiff base, and a synthesis method and application thereof, and relates to an ortho-aminophenol Schiff base compound, and a synthesis method and application thereof. The invention aims to solve the problem of poor organic phase solubility of a conventional salicylaldehyde ortho-aminophenol Schiff base zinc complex. The invention relates to a structural formula of an ortho-aminophenol Schiff base fluorescent probe compound. The synthesis method comprises: 1, FriedelCrafts alkylation; 2, formylation reaction; 3, condensation reaction. The ortho-aminophenol Schiff base serving as a fluorescent probe is applied to qualitative and quantitative analysis for a trace metal ion Zn2+. After a lipophilic group is introduced to a benzene ring of salicylaldehyde, the condensation reaction with ortho-aminophenol is performed to generate the ortho-aminophenol Schiff base, and a complex generated by coordination between the ortho-aminophenol Schiff base and a zinc ion presents good solubility in an organic phase, and a fluorescence detection signal is obviously enhanced. The invention can be applied to the field of fluorescent probes.

The invention relates to a preparation method of 2,2'-(4,4'-distylyl) dibenzoxazole by adopting a new sulphur method. The preparation method is characterized in that methyl benzoic acid and ortho-aminophenol are dissolved in solvent oil, and boric acid is taken as a catalyst, so as to generate 4-methyl benzoxazole taken as a raw material; in an oxidation condensation reaction process of 4-methyl benzoxazole, an aprotic organic solvent is adopted for replacing sulphur as a reaction medium, wherein the aprotic organic solvent is diphenyl ether, hexamethylphosphoric triamide or formamide, a reaction temperature is 190-230 DEG C, reaction time is controlled to be 3-4 hours, energy consumption is reduced, and reaction yield and product quality are improved as the salvation effect and using amount of sulphur are reduced; and besides, equipment investment is reduced, and solid waste is greatly reduced, so that the preparation method is a clean production technology. A fluorescent brightener OB-1 provided by the invention can be used in ingredients of plastics, chemical fibers and the like for whitening and brightening.

This invention describes the coding gene and applications of a nitrobenzene nitro-reducing enzyme, comprising a protein from the following amino acid residue sequences: 1) SEQ ID No. 1 in the sequence table; 2) the amino acid residue sequence in SEQ ID No. 1 is a protein substituted, deleted or added with 1-10 amino acid residues and having the nitrobenzene nitro-reducing enzyme function. The nitrobenzene nitro-reducing enzyme and its coding gene in this invention play an important role in the production of ortho-aminophenols and their derivatives.

The present invention relates to a fluorescent molecular probe and particularly to preparation and application of a rhodamine B derivative. A preparation method comprises the following steps of enabling a rhodamine B hydrazinolysis product to react with glyoxal in anhydrous ethanol at the room temperature for 6-8 hours, and precipitating a solid to obtain an intermediate compound; and enabling the intermediate to react with ortho-aminophenol in the anhydrous ethanol at the temperature of 70-80 DEG C for 4-6 hours, cooling down the reaction product, then carrying out suction filtration on the precipitated solid, and performing washing, drying and separating to obtain a yellow solid P as shown in a formula 1. The rhodamine B derivative P can be used as a fluorescent probe to implement identification and detection on aluminum ions. According to the present invention, the rhodamine B derivative P obtained by an effective combination means shows good selectivity for Al<3+>, and on the basis of optimizing an experimental condition, detection on the aluminum ions can be implemented. The formula 1 is shown as the specification.

The invention discloses a synthesis method of 8-hydroxyquinoline. On the basis of Skraup reaction, reaction conditions are optimized, and 8-hydroxyquinoline is obtained through cyclization reaction of glycerinum and ortho-aminophenol; by adding anhydrous cupric sulfate and calcium oxide, water in a system can be absorbed, and concentrated sulfuric acid efficiency can be improved; meanwhile, dehydration cyclization of an addition product of aniline and acrolein can be accelerated, reaction speed is increased, reaction yield is ensured, and high economic benefits are achieved.

The invention discloses a process for preparing ortho-aminophenol by virtue of continuous catalytic hydrogenation, and the process is implemented by taking o-nitrophenol as a raw material through carrying out a continuous catalytic hydrogenation reaction in a fixed bed reactor by using a Pd / Al2O3 catalyst, and then separating and purifying the obtained product so as to obtain a target product ortho-aminophenol. The process disclosed by the invention can be used for realizing a continuous catalytic hydrogenation reaction, and is short in technological process, high in degree of automation, low in labor strength, less in equipment investment, and large in production capacity; the Pd / Al2O3 catalyst is good in selectivity and high in activity, and can be used for improving the yield and purity of products, the yield reaches up to 97%, and the purity reaches up to over 99%; no material is discharged and spills over in the whole reaction process, so that the consumption is minimized, therefore, the process is beneficial to resource conservation and environmental conservation, and has good economic and social benefits; both the labor intensity of workers is reduced, and the whole site environment is clean and tidy, so that the intrinsic competitiveness and extrinsic appearance of products are promoted, and therefore, the process is suitable for being widely applied to industrial production.

The invention discloses a method for preparing a 2-substituted benzoxazole compound, and belongs to the technical field of synthesis of benzoxazole compounds. According to the technical scheme, the method is characterized by comprising the steps that an aldehyde compound R1CHO and an ortho-aminophenol compound (please see the specification for the formula) are dissolved in solvent xylene or methylbenzene, and pre-reacting is conducted for one hour when the solvent is heated to be at the temperature of 120 DEG C; then the temperature is lowered to be an indoor temperature, catalyst copper acetylacetonate is added, and negative pressure suction is carried out in the oxygen atmosphere for reacting till TLC monitors that the reacting is complete; filtering is performed, and water and ethyl acetate are added in filter liquor to be extracted; an organic phase is dried through anhydrous sodium sulfate, column chromatography purification is carried out after the solvent is removed by steaming, and accordingly the 2-substituted benzoxazole compound (please see the specification for the formula) is obtained. According to the method, the aldehyde compound and the ortho-aminophenol compound are used as reacting raw materials, the copper acetylacetonate is used as a catalyst, oxygen is used as an oxidizing agent, no extra additives are needed, and a series of 2-substituted benzoxazole compounds are synthesized; operation is simple and practicable, the raw materials are cheap and easy to get, reaction efficiency is high and repeatability is good.

The invention discloses a method for synthesizing a beta-amidogen carbonyl compound through poly-aminophenol and titanocene dichloride in a heterogeneous catalysis mode. The beta-amidogen carbonyl compound is obtained by making ketone, aromatic aldehyde and aromatic amine to react at the temperature ranging from 25 DEG C to 50 DEG C at the presence of the titanocene dichloride serving as a catalyst and poly-ortho-aminophenol or poly-m-aminophenol. According to the method, the poly-aminophenol and the titanocene dichloride are added to a reaction system at the same time, a catalytic active species with high activity can be formed in situ, operation is simple, no solvent is added, reaction conditions are mild, the catalyst is low in price, nontoxic, stable in air and water, high in catalytic activity and capable of being repeatedly used, products are prone to separation, and the productivity is high. The method has the advantages that cost is low, environmental friendliness is achieved, and atom economy is high. The method has wide application prospects for the beta-amidogen carbonyl compound.

The invention provides a preparation method of a fluorescent whitening agent. The preparation method comprises the following steps: mixing 4-dimethylaminobenzoylchloride, p-chlorophenol ortho-aminophenol, doped SO42- / ZrO2-Fe2O3-SiO2 type mixed crystal solid superacid catalyst and ethylene glycol monobutyl ether, heating to 160-180 DEG C, performing reflux reaction for 2-3 hours, standing, separating the catalyst, adding 5-10 parts of sodium hydroxide, rising to 100-120 DEG C, stirring for 1-2 hours, standing, separating and removing the lower solution, distilling off a solvent from an upper reaction product through a decompression method, enabling the reactant to a jelly, adding water below 10 DEG C, washing and filtering, and obtaining the fluorescent whitening agent which is 2-(p-dimethylamino phenyl)-4-chlorine-benzoxazole. The preparation method of the fluorescent whitening agent is simple in process; the use of the strong acid is avoided, so that the corrosion to the equipment is avoided; the use of a large amount of water is avoided; the prepared fluorescent whitening agent is good in compatibility with a surface sizing agent in papermaking and good in whitening effect.

A high-efficiency energy-saving diesel fuel additive is prepared from the following raw materials in parts by weight: 4-8 parts of sodium carboxymethylcellulose, 2-7 parts of 2-methyl cellosolve, 4-6 parts of tritolyl phosphate, 5-8 parts of calcium peroxide, 20-26 parts of ethyl alcohol, 5-7 parts of ferrocene, 3-7 parts of petroleum ether, 5-7 parts of zinc primary alcohol dialkyl thiophosphate, 4-6 parts of graphite, 5-7 parts of N,N-disulfoxide salicyl propane diamine, 4-7 parts of isobutanol, 8-12 parts of ethelene glycol alkyl monophenyl ether, 3-7 parts of 3-hydroxybutyraldehyde, 4-8 parts of cyclopentane, 2-6 parts of triethyl orthoacetate, 4-7parts of ortho aminophenol, 2-4 parts of a modified additive and 4-6 parts of spermine. The high-efficiency energy-saving diesel fuel additive has the benefits that the utilization ratio of diesel oil is improved, an excellent protective effect is played for a fuel oil system, the heat efficiency is improved, the oil consumption is effectively reduced, and an efficient energy-saving effect can be played.

The invention discloses an aluminum ion fluorescent probe and a preparation method thereof. The method comprises the following steps: synthesizing 7-hydroxycoumarin-8-aldehyde by taking hexamethylenetetramine, 7-hydroxycoumarin and glacial acetic acid, and synthesizing the aluminum ion fluorescent probe by utilizing 7-hydroxycoumarin-8-aldehyde and ortho-aminophenol. The structure of the aluminumion fluorescent probe is represented by a nuclear magnetic spectrum and a mass spectrum; the spectral quality of the fluorescent probe is analyzed through an ultraviolet spectrum and a fluorescent spectrum; the result indicates that the fluorescent probe has high selectivity and is not interfered by other co-existing ions when identifying aluminum ions; and the probe generates coordination interaction with the aluminum ions according to the ratio of 1:1 and the reaction has reversibility. Therefore, the fluorescent probe can be applied to detection on the aluminum ions well.

The invention discloses an ortho-aminophenol wastewater treatment and recycling method and relates to a wastewater treatment method with at least one chemical treatment step. The method comprises the following steps: 1, performing wastewater pretreatment; 2, performing resin activation; 3, performing resin adsorption; 4, performing advanced treatment; 5, performing resin regeneration; and 6, recycling the ortho-aminophenol. According to the ortho-aminophenol wastewater treatment and recycling method disclosed by the invention, multiple technologies such as resin adsorption, microelectrolysis, a Fenton process and an activated carbon adsorption technology are combined, so that the ortho-aminophenol wastewater is treated, the ortho-aminophenol and chroma in the wastewater can be efficiently removed, 3.723g of the ortho-aminophenol can be recovered from per liter of wastewater at most, and the recycling purity is higher than 92%. The method has the advantages of simplicity in operation, continuous production process, less waste residues, zero waste gas, zero wastewater and the like, is clean and environmental-friendly and can be widely applied to treatment of the ortho-aminophenol. The method disclosed by the invention belongs to the technical field of wastewater treatment.

The invention relates to a method for preparing 2-trifluoromethylbenzo oxazole, including the steps of as follows: under the protection of nitrogen gas, using carbon tetrachloride as solvent, adding triphenyl phosphine and triethylamine in the reacting container, blending and lowering the temperature to 0 deg.C under the ice water bathing; then adding in trifluoro acetic acid, blending 10-20 minutes, finally adding in carbon tetrachloride dissolved ortho-aminophenol, where the molar ratio of four reactants triphenyl phosphine, triethylamine, trifluoro acetic acid, and ortho-aminophenol is (3-3.5) : (3-3.5) : 1 : (1-1.2); heating to start acute reaction, immediately removing heat source, continuing returning and reacting 3-5 hours, as the reaction ends, vacuum evaporating the solvent from the reacting solution, then adding the solvent petroleum mixed of petroleum ether and acetate in the bulk ratio of 10 to 1 into a bottle to mix into a, soaking, pump filtering, washing the solid in buchner funnel with the mixed solution; making chromatographic resolution on the obtained liquor, and collecting the 25-28 deg.C / 2mmHg fractions, thus obtaining the products 2-trifluoromethylbenzo oxazole. The material materials of the invention are easy to obtain, the operation is extremely simple, and the synthesis is one-boiler made. The method has high yield, suitable to large-scale production.

The invention discloses a Schiff base derivative and a preparation method thereof. A structural formula of the Schiff base derivative is as shown in the specification. The preparation method includes:subjecting ortho-aminophenol and p-tolualdehyde in a molar ratio of 1:1-2 to reaction in a hydrothermal reaction kettle for 180-360min at a reaction temperature of 90-170 DEG C, wherein the water filling degree of the hydrothermal reaction kettle is 30-70%; after reaction is finished, subjecting reaction products to filtering, drying and recrystallizing to obtain the Schiff base derivative. By substitution of a conventional organic solvent with water as a reaction medium without use of any catalysts, nontoxicity, harmlessness and environmental friendliness are realized. In addition, by reaction material selection and reaction condition optimization, yield of the prepared Schiff base derivative is greatly increased and maximally reaches 68.8% which is evidently higher than the yield of theSchiff base derivative prepared according to an existing similar method.

The invention relates to a recycling and treating method of p-toluic acid and ortho-aminophenol in wastewater of a process for synthesizing 2-(4-methyl phenyl)-benzoxazole by taking the p-toluic acid and the ortho-aminophenol as raw materials. The method is characterized by comprising the steps that p-toluic acid precipitates are firstly precipitated out through acidification, and the p-toluic acid is recycled through filtration; filtrate is treated with a reducing agent, the pH value of the filtrate is regulated to be alkali, adsorption is performed with adsorbent resin, elution and analysis are performed, the pH of eluant is regulated to 8.5-9, concentrating and temperature lowering are performed to precipitate phenol out, and filtration is performed to obtain the ortho-aminophenol. According to the method, the p-toluic acid and the ortho-aminophenol in the process wastewater can be economically and effectively recycled, the purity of the p-toluic acid and the purity of the ortho-aminophenol can reach 94.5% or above and 95.8% or above respectively, and the p-toluic acid and the ortho-aminophenol can directly serve as the raw materials to be put and used over and over again in a condensation reaction; organic solvent is not related and used in the treatment process, secondary environmental pollution is not generated, cleanliness and environmental protection are achieved.

The invention relates to a cocoanut fiber reinforced polypropylene complex and a preparation method thereof. The complex comprises the following components in percentage by weight: 52 to 85 percent of polypropylene, 10 to 40 percent of cocoanut fibers, 3 to 8 percent of compatilizer, 0.1 to 1 percent of antioxidant and 0.1 to 1 percent of lubricant. The preparation method comprises the following steps of: dissolving ortho-aminophenol in hydrochloric acid, and mixing the solution and NaNO2 to obtain ortho-cloro diazo phenol solution; soaking the cocoanut fibers in ice water bath of NaOH; dropwise adding ortho-cloro diazo phenol solution into the ice water bath of NaOH; taking out the cocoanut fibers and drying the cocoanut fibers in the air; mixing the treated cocoanut fibers and the other raw materials; and adding the mixture in a screw extrusion machine, and extruding and pelleting the mixture to obtain the product. When the preparation method is compared with the prior art, the cost of the raw materials is further reduced. Due to the introduction of the cocoanut fibers, plastic fittings used for vehicles and prepared from the material are easier to recycle and treat.

The invention relates to a process for preparing phenetidin and amino phenol by taking a mixture of nitrophenetol and nitrophenol as a raw material. The process comprises the following steps that: (1) a step of the catalytic hydrogenation reaction to a body, during which, the mixture of the nitrophenetol and the nitrophenol is taken as the raw material, catalyst is added, hydrogen is aerated; (2) a step of the solid-liquid separation, during which, solid and liquid in the material obtained from the step (1) after the catalytic hydrogenation reaction are separated, a liquid phase is utilized in the next step; (3) a step of the liquid-liquid separation, during which, the oil phase-water phase liquid-liquid separation is performed in the material obtained in the step (2), an oil phase is utilized in the next step; (4) a step of crystallization; (5) a step of solid-liquid separation, during which, solid and liquid of the material crystallized in the step four are separated, the solid phase is paraaminophenol and ortho-aminophenol, the phenetidine in the liquid phase is utilized in the next step; (6) a step of distillation separation, during which, the products of para aminophenyl ethyl ether and o-phenetidine are obtained. The process for preparing the aminoanisole and the aniline has the advantages that: the cost is low, the preliminary treatment step is saved, and the process is simple; and the process is clean, the energy consumption is low, and the 'three wastes' are little.

The invention discloses 8-hydroxyquinoline and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a reaction reagent A, namely, mixing ortho-aminophenol and o-nitrophenol; (2) preparing a reaction reagent B, namely, mixing formic acid and acrolein, and adding a zeolite molecular sieve into a mixed liquid of the formic acid and the acrolein; (3) heating the reaction reagent A to 95-100 DEG C, adding the reaction reagent B, enabling the component to react under a condition of constant-temperature stirring, filtering, and cooling the filtrate to the room temperature; and (4) neutralizing the filtrate obtained in the step (3) by using a 40% sodium hydroxide solution, filtering again, and performing reduced pressure distillation, thereby obtaining a final expected product, that is, 8-hydroxyquinoline. Compared with the prior art, the preparation method has the advantages of rapid reaction, gentle condition and high yield and is particularly applicable to industrial production.

The invention discloses a chemical treatment method, in particular to an ortho-aminophenol wastewater advanced treatment or recycling method. The method includes: using a single-chamber reactor consisting of a three-dimensional electrode system for advanced treatment of ortho-aminophenol wastewater by means of an electrochemical oxidation method, wherein the single-chamber reactor is formed by using a DSA (dimensionally stable anode) electrode as an anode material, using a stainless steel plate equal to the DSA electrode in size as a cathode, and filling a gamma-Al2O3 loaded manganese oxide used as a particle electrode between electrode plates, and the electrode spacing is 1cm; electrolyzing for more than 10min in the reactor, wherein current density is 30-70mA cm<-2>, and pH ranges from 3 to 11; and adding MnO2 / gamma- Al2O3 particle electrode materials according the solution mass ratio of 0.5-5.0wt%. The ortho-aminophenol wastewater advanced treatment or recycling method has the advantages of high oxidizability, high removal efficiency, environment friendliness and the like and has wide usage.

The invention relates to a polymerization inhibitor used for inhibiting polymerization of a petroleum cracked C5 fraction. The polymerization inhibitor consists of a component 1, a component 2, a component 3 and a solvent, wherein the component 1 is di methyl ketoxime; the component 2 is 2,2,6,6-tetramethyl-4-piperidinol; the component 3 is ortho-aminophenol; the solvent is acetonitrile or dimethylformamide; a weight ratio of the component 1 to the component 2 to the component 3 is 1:(0.1-2):(0.2-2.5); the component 1, the component 2 and the component 3 are 2 to 10 percent based on the weight of the solvent; and the using amount of the polymerization inhibitor in the petroleum cracked C5 fraction is 20 to 800ppm according to weight. The polymerization inhibitor provided by the invention has better polymerization inhibiting effect, can effectively inhibit auto polymerization or polymerization of diolefins in the petroleum cracked C5 fraction in a separating column, and avoids blockageof a reboiler; the using amount of the polymerization inhibitor is small and the production cost can be reduced; and the difference between boiling points of various components and the solvent of thepolymerization inhibitor and the boiling point of the petroleum cracked C5 fraction is great, so the petroleum cracked C5 fraction is easy to separate.

The invention discloses a method for preparing triazole derivatives. The method comprises the following steps: taking aryl sulfonyl azide derivatives and acetylenic derivatives as raw materials, taking cuprous iodide and ortho-aminophenol as catalysts, and carrying out a cyclization reaction under the condition of an aprotic polar solvent, thereby obtaining the triazole derivatives. According to the method for preparing triazole derivatives disclosed by the invention, the reaction substrate is wide in universality, and the method is mild in reaction conditions, simple and convenient to operateand high in yield.

The invention belongs to the technical field of a chemical industry, and particularly relates to a novel technology for preparing ortho-aminophenol. By adopting the novel technology for preparing the ortho-aminophenol disclosed by the invention, more 1.1-1.2 tons of elemental sulfur and 2 tons of sodium sulfate solid can be recovered from per 1 ton of ortho-aminophenol, a hydrogen sulfide gas can be obtained after acidification, sodium hydrosulfide is generated by virtue of an absorption tower to put into reproduction, 3-4% of solid waste can be obtained by using four-effect evaporation, and can be put into reproduction, the traditional technology can be used for purifying just by rectification, and the purity of the ortho-aminophenol can be improved by distillation firstly, so that the energy source and equipment are saved, the wastewater generated in the production process can be recycled, finally, wastewater is hardly generated, and impurities are also discharged and recycled in the process.

A process for the production of ortho-aminophenolic analogs of chloramphenicol using a biocatalyst consisting of pure enzymes, partially purified enzymes, cell lysate, intact cells, or a metal reaction linked with a subsequent enzymatic reaction. The biocatalyst is an enzyme system that makes use of a nitroreductase enzyme that initially reduces the nitroarene to the hydroxylaminoarene and a mutase enzyme that converts the hydroxylaminoarene to an ortho-aminophenol. The biocatalyst can also consist of a coupled, two-step metal and enzyme reaction in which the metal, such as zinc, catalyzes the transformation of the nitroarene to the hydroxylaminoarene and the mutase then catalyzes the transformation of hydroxylaminoarene to the corresponding ortho-aminophenol.

The invention discloses a method of synthesizing 8-hydroxyquinoline. Ortho-aminophenol and acrolein are used as raw materials, and hydroquinone is used as a polymerization inhibitor; an addition reaction and a cyclization reaction are carried out under the acidic condition to obtain an intermediate, and a cobalt oxime chelate photocatalyst and an eosin Y photosensitizer are directly added withoutthe need of separation of the intermediate; and an acetonitrile solvent and deionized water are added, under continuous irradiation of visible light, the 8-hydroxyquinoline is obtained through a photocatalytic dehydrogenation oxidation reaction. The reaction process is easy to control, by-products are few, post-treatment is simple, and the generated target product is good in selectivity, high in yield and stable.

This invention describes a hydroxylamine benzene dismutase, its coding gene and applications. The hydroxylamine benzene dismutase in this invention comprises a protein from the following amino acid residue sequences: 1) SEQ ID No. 1 in the sequence table; 2) the amino acid residue sequence in SEQ ID No. 1 is a protein substituted, deleted or added with 1-10 amino acid residues and having the nitrobenzene nitro-reducing enzyme function. The hydroxylamine benzene dismutase and its coding gene in this invention play an important role in the production of ortho-aminophenols and their derivatives.

The invention discloses a method for preparing a 2-substituted benzoxazole compound, and belongs to the technical field of synthesis of benzoxazole compounds. According to the technical scheme, the method is characterized by comprising the steps that an aldehyde compound R1CHO and an ortho-aminophenol compound (please see the specification for the formula) are dissolved in solvent xylene or methylbenzene, and pre-reacting is conducted for one hour when the solvent is heated to be at the temperature of 120 DEG C; then the temperature is lowered to be an indoor temperature, catalyst copper acetylacetonate is added, and negative pressure suction is carried out in the oxygen atmosphere for reacting till TLC monitors that the reacting is complete; filtering is performed, and water and ethyl acetate are added in filter liquor to be extracted; an organic phase is dried through anhydrous sodium sulfate, column chromatography purification is carried out after the solvent is removed by steaming, and accordingly the 2-substituted benzoxazole compound (please see the specification for the formula) is obtained. According to the method, the aldehyde compound and the ortho-aminophenol compound are used as reacting raw materials, the copper acetylacetonate is used as a catalyst, oxygen is used as an oxidizing agent, no extra additives are needed, and a series of 2-substituted benzoxazole compounds are synthesized; operation is simple and practicable, the raw materials are cheap and easy to get, reaction efficiency is high and repeatability is good.