145 results about "Bromobenzene" patented technology

The invention discloses an active oxygen activated near-infrared region photo-thermal reagent and a preparation method and application thereof.The near-infrared region photo-thermal reagent with active oxygen response is constructed by means of etherification reaction of phenolic hydroxyl functionalized aza-BODIPY dye and p-bromophenylboronic acid pinacol ester and further prepared into nanoparticles, and the near-infrared region photo-thermal reagent with the active oxygen response function is prepared into the active oxygen activated near-infrared region photo-thermal reagent. After the nano particle reacts with active oxygen, the photo-thermal efficiency of the nano particle is remarkably improved under 808nm laser illumination, and the nano particle has an excellent photo-thermal imaging effect and a photo-thermal treatment function.

The invention provides a cationic conjugated polymer as well as a preparation method and application thereof. The structural formula of the cationic conjugated polymer is shown in the specification. The preparation method comprises the following steps: reacting tris (4-bromophenyl) amine and N, N-dimethyl-4-(4, 4, 5, 5-tetramethyl-1, 3, 2-dioxaborolane-2-yl) aniline in an organic solvent under the action of a catalyst and an initiator to obtain a first intermediate; the cationic conjugated polymer is prepared from the first intermediate, the second intermediate and the third intermediate under the action of a catalyst and an initiator. The cationic conjugated polymer shows good photo-thermal and photodynamic performance under the irradiation of near-infrared light with the wavelength of 980 nm, so that the effect of inhibiting the growth of bacteria is realized. # imgabs0 #

The invention relates to a synthesis process of an omarigliflozin intermediate, and belongs to the technical field of drug synthesis, one-step efficient conversion is adopted in the process of synthesizing the omarigliflozin intermediate, p-bromophenylhydrazine hydrochloride is used as a starting raw material, and a target product is obtained through indole cyclization, alkali precipitation and acidification crystallization. Toluene plays a role in cyclization and dehydration in a high-temperature reflux process, in a purification process of alkali precipitation and acidification crystallization, a sodium hydroxide aqueous solution is utilized to hydrolyze and convert a product into water-soluble sodium salt, the water-soluble sodium salt enters a water phase, a toluene layer containing a large amount of organic impurities and the water phase are layered in a standing and layering process, and the organic impurities in the toluene layer are removed; the preparation method comprises the following steps of: preparing a sodium salt, acidifying in a water phase by using hydrochloric acid, changing the sodium salt form of the product into an acid form, and crystallizing from the water phase, which is equivalent to recrystallization purification, so that the prepared product has higher purity, the purity is stabilized at 98% or above, and the purity of the product can meet the quality standard of medical intermediates.

The application provides an ester-based electrolyte containing a bromobenzene additive for a sodium metal battery and a sodium metal battery, the ester-based electrolyte comprising a bromobenzene additive, an ester-based solvent and a sodium salt; the bromobenzene additive accounts for 1-10 vol% of the ester-based electrolyte. The electrolyte realizes spherical growth of sodium and reduces the formation of 'dead sodium'; the amount of the electrolyte additive is small, the effect of improving the sodium metal deposition morphology and cycle stability is remarkable, and the electrolyte has great industrialization potential.

The invention relates to an organic crystalline piezoelectric material based on chiral 4-bromophenylethylamine hydrochloride, which is synthesized by using hydrochloric acid as an anion and protonated (R / S)-4-bromophenylethylamine as a cation according to the stoichiometric ratio of (R / S)-4-bromophenylethylamine to hydrochloric acid of 1: 1. The invention provides an organic crystalline piezoelectric material based on chiral 4-bromophenylethylamine hydrochloride and a preparation method, and provides a two-dimensional hydrogen bond network construction strategy based on protonated chiral amine: protonated (R / S)-4-bromophenylethylamine cations are used as structural elements, chloride ions are used as charge balance bodies, and the chiral 4-bromophenylethylamine hydrochloride is prepared by precisely regulating the interaction of intermolecular hydrogen bonds. Constructing a two-dimensional hydrogen bond network with high orientation; by enhancing ordered arrangement of molecular dipoles and optimizing a lattice strain-polarization response collaborative mode, breakthrough improvement of piezoelectric performance is successfully realized, and a new normal form is provided for developing high-performance organic piezoelectric materials.

Belonging to the technical field of fine chemical product separation and purification, the invention discloses a beta-bromophenylethane rectification purification process, which comprises the steps of system negative pressure pretreatment, falling film evaporation directional separation, structured packing layer gas-liquid mass transfer, precise reflux ratio regulation and control, segmented collection (front fraction-qualified product), and residual liquid treatment and system circulation. According to the process, the negative pressure of a system is stabilized at 800-1200 Pa, the material temperature of a falling film evaporation discharging end is controlled at 125-135 DEG C, the feeding flow is stabilized at 1.8-2.2 m / h, the reflux ratio is regulated and controlled at 0.8: 1-1.2: 1, and the process realizes efficient purification of beta-bromopheny ethane through precise negative pressure control, synergistic linkage of falling film evaporation and a rectifying tower, segmented material collection and a circular treatment mechanism, so that the process is suitable for industrial production of beta-bromopheny ethane. According to the method, the purity of beta-bromopheny ethane can stably reach 99.5% or above, the material recovery rate is increased to 92% or above, energy consumption is reduced by 15-20% compared with that of a traditional process, material thermal decomposition loss is avoided, and the method is suitable for industrial large-scale production.

The invention discloses a ferrocene-based D-A type multi-system conjugated small molecule synthesis method, which comprises: carrying out a heating reaction in an organic solvent by using a ferrocenyl compound and a bromophenyl compound as raw materials and using a palladium complex as a catalyst, and after the reaction is completed, carrying out extraction, column chromatography and recrystallization to prepare an intermediate; the obtained intermediate and a 4-pyridine boric acid compound are used as raw materials, a palladium complex is used as a catalyst, a heating reaction is conducted in an organic solvent, and after the reaction is finished, cooling, extraction, column chromatography and recrystallization are conducted to prepare the D-A type multi-system conjugated small molecules. The invention also discloses a memory device with a sandwich structure and application of the memory device to ultra-high density information storage. The small molecular material prepared by the invention not only can realize ternary information storage performance, but also greatly improves the stability of the device through stable redox cycle of the ferrocene group, and realizes long-time stable ultrahigh-density information storage.

The invention relates to a one-pot synthesis method of a fluxapyroxad intermediate 3 ', 4', 5 '-trifluoro-2-nitrobiphenyl, and belongs to the technical field of organic synthesis.The method comprises the following steps that 1, under nitrogen protection, magnesium chips, a catalyst and a solvent are added into a reaction flask, then a mixed solution of 3, 4, 5-trifluorobromobenzene, o-chloronitrobenzene and boric acid ester is dropwise added, a reaction is conducted for 1-2 h, and a reaction solution is obtained; after dropwise adding, carrying out heat-preservation reaction; 2, after the reaction is finished, 10% diluted hydrochloric acid is added for acidification and water washing, after phase splitting, an obtained organic phase is subjected to vacuum concentration, and 3 ', 4', 5 '-trifluoro-2-nitrobiphenyl is obtained. Compared with a traditional synthesis method of the fluxapyroxad intermediate, the synthesis method of the fluxapyroxad intermediate has the advantages that 3, 4, 5-trifluorophenylboronic acid does not need to be prepared firstly, 3, 4, 5-trifluorobromobenzene and o-chloronitrobenzene are directly used as raw materials, the one-pot synthesis method is short in reaction route and high in raw material utilization rate, and the raw material cost can be greatly reduced.

The invention belongs to the technical field of pesticide chemistry, and particularly relates to an application of a substituted phenylhydrazine copper salt complex as an agricultural fungicide, the structural general formula of the substituted phenylhydrazine copper salt complex is [Cu (ArNHNH2) 2] Xn, Ar is selected from 3-chlorphenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, 2, 4-dichlorophenyl-, the compound is prepared from 2, 6-dichlorophenyl, p-trichloromethoxyphenyl, 4-trifluoromethylphenyl, 4-trifluoromethoxyphenyl, 4-bromophenyl, 4-nitrophenyl, 4-cyanophenyl and 4-carboxyphenyl, and the compound is prepared from 2, 6-dichlorophenyl, p-trichloromethoxyphenyl, 4-trifluoromethylphenyl, 4-trifluoromethoxyphenyl, 4-bromophenyl, 4-nitrophenyl, 4-cyanophenyl and 4-carboxyphenyl. X is selected from SO4 <->, Cl <-> and NO3 <->; n is equal to 1-2. The substituted phenylhydrazine copper salt complex disclosed by the invention has remarkable inhibitory activity on plant pathogenic bacteria, has very high inhibition rate on three plant pathogenic fungi, namely fusarium graminearum, rhizoctonia solani and sclerotium rolfsii, can be used as a safe and efficient novel bactericide, and is applied to prevention and treatment of various crop diseases.

The present invention relates to a method for synthesizing the fluxapyroxad intermediate trifluoronitro - biphenyl, belonging to the technical field of organic synthesis. The method process includes the following: Step1: Under nitrogen protection, add 3,4,5 - trifluorobromobenzene, o - nitrophenylboronic acid, a catalyst, a cocatalyst, a base and a solvent into a reaction flask. After addition, carry out a heat - preservation reaction; Step2: After the reaction is completed, through phase separation, the organic phase is concentrated to obtain 3’,4’,5’ - trifluoro - 2 - nitrobiphenyl. In the present invention, compared with the traditional method for synthesizing trifluoronitro - biphenyl, the method for synthesizing trifluoronitro - biphenyl directly uses 3,4,5 - trifluorobromobenzene and o - nitrophenylboronic acid as raw materials, avoiding the production steps of preparing 3,4,5 - trifluorobenzeneboronic acid from 3,4,5 - trifluorobromobenzene through multiple steps. Moreover, it can effectively improve the yield, has a high raw material utilization rate, and the preparation method of o - nitrophenylboronic acid is simple, which can effectively reduce the reaction cost. The reaction route is shorter, simpler and more efficient, the reaction conditions are mild, and it has high industrial application value.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a method for preparing deuterated 1, 3-dibromobenzene by adopting a hydrogen-deuterium exchange method, which comprises the following steps of: in the presence of a catalyst and alkali, carrying out hydrogen-deuterium exchange reaction on 1, 3-dibromobenzene and heavy water in an organic solvent, and further purifying to obtain the deuterated 1, 3-dibromobenzene. The preparation method utilizes a hydrogen-deuterium exchange process to synthesize deuterated 1, 3-dibromobenzene in one step, and has the advantages of simplicity and convenience in operation, high safety, high yield, good economic applicability, easiness in purification and the like.

The invention belongs to the technical field of medicine preparation, and particularly relates to a fenoprofen calcium preparation method which comprises the following steps: 1) m-hydroxyacetophenone and bromobenzene generate an intermediate 1, namely m-phenoxyacetophenone under the action of alkali and cuprous iodide; 2) reacting the intermediate 1 with ethyl chloroacetate under the action of strong base, and then performing hydrolysis and decarboxylation reaction to generate an intermediate 2, namely 2-(3-phenoxy phenyl) propionaldehyde; the invention discloses a preparation method of fenoprofen calcium, which comprises the following steps: (1) preparing fenoprofen, (2) preparing fenoprofen, (3) carrying out oxidation reaction on an intermediate 2 to obtain fenoprofen, (4) reacting fenoprofen with a sodium hydroxide solution to obtain fenoprofen sodium, and (5) salifying fenoprofen sodium with a calcium chloride solution to obtain fenoprofen calcium.

The application discloses a synthesis method of aromatic aldehyde, comprising the following steps: under inert atmosphere, a compound shown in formula I and a compound shown in formula II are reacted in an organic solvent containing a photocatalyst, a nickel catalyst, a ligand, a base and water under blue light irradiation to obtain aromatic aldehyde shown in formula III; formula I, formula II and formula III are structures as follows, ring A is selected from benzene, pyridine, thiophene, furan, pyridazine, indazole, indole, isoquinoline, quinoline, naphthalene, benzothiophene, dibenzofuran or dibenzothiophene; the application generates formyl radicals under the nickel synergistic photo-oxidation and reduction catalytic condition, and the formylation of bromobenzene and its derivatives is realized in a simple and efficient one-pot way, aromatic aldehyde is constructed, and the reaction has the characteristics of cheap and easily available raw materials, mild reaction conditions, controllable synthesis process, high separation yield / yield, green environmental protection, wide substrate applicability and the like.

The present invention relates to a one-pot synthesis method of the fluxapyroxad intermediate 3',4',5'-trifluoro-2-nitrobiphenyl, belonging to the technical field of organic synthesis. The method process includes the following steps: Step 1: Under nitrogen protection, add magnesium chips, a catalyst and a solvent to a reaction flask, and then dropwise add a mixed solution of 3,4,5-trifluorobromobenzene, o-chloronitrobenzene and borate ester. After the dropping is completed, keep the reaction under heat preservation; Step 2: After the reaction is completed, acidify and wash with 10% dilute hydrochloric acid, and after phase separation, the obtained organic phase is concentrated under reduced pressure to obtain 3',4',5'-trifluoro-2-nitrobiphenyl. In the present invention, compared with the traditional synthesis method of the fluxapyroxad intermediate, the synthesis method of the present fluxapyroxad intermediate does not need to prepare 3,4,5-trifluorophenylboronic acid first, but directly uses 3,4,5-trifluorobromobenzene and o-chloronitrobenzene as raw materials. The "one-pot" synthesis method has a short reaction route, high raw material utilization rate, and can greatly reduce the raw material cost.

The invention relates to a preparation method of a high-performance imidazolyl polyionic liquid membrane, and belongs to the technical field of ionic membranes. The method comprises the following steps: by taking N-methyl pyrrolidone as a solvent, reacting 2-phenylbenzimidazole or 2, 4, 5-triphenylimidazole with 4, 4-difluorodiphenyl sulfone, 1, 4-dibromobenzene, 4, 4-dibromodiphenyl or 4, 4-dibromodiphenyl terphenyl in a hydrothermal reaction kettle, washing and drying to obtain a product I; under the catalysis of super organic acid, reacting the product I with biphenyl or p-terphenyl and N-methyl-4-piperidone, washing and drying; adding methyl iodide in an alkaline environment for reaction, and washing and drying to obtain polyion liquid; and dissolving in dimethyl sulfoxide, coating on a glass plate, and drying to prepare the film. The polyionic liquid membrane prepared by the method has more ionic sites, and the ionic conductivity is remarkably improved. Tests show that the stability of the membrane is almost unchanged after 1500 hours under the conditions of 80 DEG C and 1M KOH, the wet mechanical property reaches 60 MPa or above, and the membrane has high chemical and mechanical stability and wide application prospects.

The invention discloses a preparation method of a key intermediate epoxide of rubaburon, and belongs to the technical field of organic synthesis. The method comprises the following steps: (1) adding a solvent, 2-(2-bromophenyl) thiophene and a basic catalyst into a reaction container, dropwise adding glycidol while stirring, and continuously reacting after dropwise adding until the 2-(2-bromophenyl) thiophene is completely reacted; and (2) cooling and filtering to remove salt, concentrating filtrate to be dry, adding methanol, heating and dissolving, cooling and crystallizing, filtering and drying to obtain the 2-((2-thiophene-2-yl) phenoxy) methyl) ethylene oxide. According to the invention, new raw materials and a new synthetic route are selected to prepare the key intermediate epoxide of the rubaburon, the production process is simple, and the key intermediate epoxide of the rubaburon, which is higher in yield, less in side reaction and lower in cost, is obtained.

The invention belongs to the technical field of organic chemical synthesis, and particularly relates to a synthetic method of deuterated toluene-D3, which comprises the following steps: reacting deuterated iodomethane with magnesium to obtain a Grignard reagent deuterated methyl magnesium iodide; and then carrying out coupling reaction on the deuterated methyl magnesium iodide and bromobenzene under the catalysis of a nickel metal catalyst to obtain the deuterated toluene-D3. The synthesis method solves the problems of many byproducts, high cost and low utilization rate of deuterated raw materials when the existing toluene synthesis process is used for preparing semideuterated toluene, realizes efficient synthesis of high-purity deuterated toluene-D3, greatly reduces the generation of polymethyl compounds, and is short in production period and simple in post-treatment.

The invention discloses a method for preparing m-fluoroaniline, which comprises the following step of: reacting m-bromofluorobenzene with secondary amine in a solvent in the presence of sodium hydride to obtain an m-fluoroaniline compound. According to the method, secondary amine and m-fluorobromobenzene are used as raw materials, m-fluoroaniline is prepared through reaction under NaH, all the raw materials are cheap and easy to obtain, the reaction is simple and reliable, operation is easy, and the method is a novel method for preparing m-fluoroaniline. The method does not need transition metal catalysis, reagents are cheap and easy to obtain, operation is simple, and the substrate range is wide; the method for preparing the m-fluoroaniline compound has application value in medicine synthesis.

The present invention relates to emulsifiable concentrate formulations comprising the herbicides pyrasulfotole and bromoxynil.

The invention belongs to the technical field of chemical engineering, and discloses a preparation method, a condensing agent and application of beauty peptide prolyl-prolyl-lysine, and the method comprises the following steps: using proline as an initial raw material, and reacting with benzyl bromide to generate proline with benzyl protecting amino; in water, sodium bicarbonate is used for preparing sodium salt, the sodium salt and a condensing agent are used for preparing active lipid, the active lipid and unprotected proline directly react, and Bn-Pro-Pro-OH is obtained after the reaction is completed; the preparation method comprises the following steps: preparing a sodium salt from Bn-Pro-Pro-OH and sodium bicarbonate in water, preparing active lipid from the sodium salt and the active lipid by using a condensing agent, and condensing the active lipid and N6-Cbz-L-lysine to obtain Bn-Pro-Pro-Lys (Z)-OH; and finally, hydrogenating to obtain the beauty peptide prolyl-prolyl-lysine. The prolyl-prolyl-lysine tripeptide product obtained by the method disclosed by the invention is relatively high in purity, low in raw material cost, simple to operate and suitable for industrial production, and can meet the requirements of the future skin care product industry.

The present invention provides a preparation method and application of a sulfonated photocatalyst, belonging to the technical field of photocatalyst materials. The preparation steps include: reacting 2,5-dibromopyrimidine with trimethylsilylacetylene in anhydrous triethylamine and tetrahydrofuran, followed by extraction and purification to obtain a first intermediate; dissolving the first intermediate in tetrahydrofuran, dropping tetrabutylammonium fluoride for hydrolysis at a temperature below -40 °C, followed by extraction and purification to obtain a second intermediate; dissolving the second intermediate and 5,10,15,20-tetra(4-bromophenyl)porphyrin in N,N-dimethylformamide and diisopropylamine, and carrying out a Sonogashira coupling reaction under catalytic action; after the coupling reaction is completed, filtering, extraction and vacuum drying are carried out to obtain an initial polymer. The preparation method of the sulfonated photocatalyst provided by the present invention is simple, efficient and environmentally friendly. The prepared sulfonated photocatalyst has both excellent hydrophilicity and high oxygen adsorption capacity, and can efficiently produce H2O2.

The present invention relates to a herbicide mixture comprising L-glufosinate or a salt thereof and a herbicide compound II selected from beflubutamid-M, tetflupyrolimet, dimethosulfazet, benquitrione, bipyrazon, sipylafuon, dioxopyritrione, fenpyrazon, limisoxafen, tripyrasulfone, flucolaminopyl, flucolaminopyl-tefuryl, pyriflubenzoxime, flufenoxymasil, flusulfinam, iprotriazid, ikafolin, pyraquinate, and bromoxynil. The present invention further relates to a method for controlling unwanted vegetation in burn-down programs, industrial vegetation management and forestry, drilled crops, vegetable crops and perennial crops, and turf and lawns.

The application provides a preparation method of 2,4,6-trifluorobenzoic acid, which comprises the following steps: 1) subjecting 1,3,5-trifluorobenzene to a bromination reaction to obtain 2,4,6-trifluorobromobenzene; and 2) subjecting the 2,4,6-trifluorobromobenzene to a Grignard reaction to obtain 2,4,6-trifluorobenzoic acid. The method has the advantages of short flow, simple process, high molar yield and high purity of 2,4,6-trifluorobromobenzene, low cost of 2,4,6-trifluorobenzoic acid prepared by the method, and relatively environmentally-friendly and safe operation process, and is suitable for large-scale production.

This invention provides a cyan-transparent electrochromic polymer, its preparation method, and its applications, belonging to the field of electrochromic polymer technology. The invention uses 6,6'-(2,6-dibromo-4H-cyclopentano[2,1-b:3,4-b']dithiophene-4,4-diyl)bis(hexyl-1-ol), 2,6-di(trimethyltin)-4,4-di(2-ethylhexyl)-dithiophenecyclopentadiene, and 4,7-dibromobenzo[c][1,2,5]thiadiazole as main raw materials, reacting them under the action of a catalyst to obtain a cyan-transparent electrochromic polymer. The film made from the cyan-transparent electrochromic polymer of this invention has an optical contrast ratio of 47.01% in the 719 nm wavelength range, a coloring time of 0.81 s, and a fading time of 0.32 s.

This invention discloses a method for synthesizing a dipeptide linker for antibody-coupled degradation, relating to the field of organic synthesis. 1-[(3S)-3-{[(4-{[(2-bromophenyl)oxy]methyl}phenyl)amino]carbonyl}-8-methyl-1-oxoylide-2,8-diazanon-1-yl]cyclobutane-1-carboxylic acid ethyl ester (CAS: 2760139-12-4) is a cleavable dipeptide linker for antibody-coupled degradation, which can be used to synthesize antibody-coupled active molecules. This invention uses readily available and inexpensive commercial raw material p-aminobenzyl alcohol as a starting material, and through seven conventional steps, obtains the target product with high purity and high yield. The starting material is inexpensive, the operation is simple, the reaction conditions are mild, and it can be prepared in large quantities at the hundred-gram scale, representing a completely new synthetic route.

The invention discloses a cobalt-doped three-dimensional porphyrin graphite monoalkyne catalyst as well as a preparation method and application thereof. The catalyst is marked as Co-Por-GY / MWCNTs (multi-walled carbon nanotubes); the material is composed of a two-dimensional cobalt porphyrin graphite alkynyl film Co-Por-GY and multi-walled carbon nanotubes (MWCNTs), the cobalt porphyrin graphite alkynyl film wraps the MWCNTs, and the cobalt porphyrin graphite alkynyl film and the MWCNTs jointly form a three-dimensional structure; according to the cobalt porphyrin graphite monoacetylene thin film Co-Por-GY, a stable two-dimensional conjugated structure is formed by connecting a metalloporphyrin complex 5, 10, 15, 20-tetra (4-bromophenyl) cobalt porphyrin and butynedioic acid through a decarboxylation coupling reaction. The preparation method comprises the following four key steps: synthesizing the TBPP, doping the Co-TBPP, purifying the MWCNTs and finally assembling the composite catalyst. The catalyst is used for oxygen reduction reaction (ORR), the structural stability and the catalytic performance are remarkably improved, and the catalyst has obvious advantages in the aspects of the preparation process and the actual application effect.

The application discloses a preparation method and application of a hollow conjugated microporous polymer. It belongs to the field of photocatalytic organic synthesis and comprises the following steps: step S1, dispersing SiO2 nanosphere templates in a triethylamine solvent; step S2, adding 4,7-dibromo-2,1,3-benzothiadiazole, dichlorobistriphenylphosphine palladium and cuprous iodide; step S3, slowly adding a toluene solution of 1,3,5-triethynylbenzene; step S4, heating, stirring, washing, etching with a hydrofluoric acid solution, washing and drying to obtain the hollow conjugated microporous polymer. The hollow spherical structure of the hollow conjugated microporous polymer enhances light capture; high specific surface area and hierarchical pores promote mass transfer and active site exposure; the D-A type conjugated system constructed by BT units effectively narrows the band gap, expands the visible light response range and greatly improves the charge separation efficiency; and the all-organic composition makes the hollow conjugated microporous polymer environmentally friendly and relatively low in cost.

The invention discloses short-chain dehydrogenase for synthesis of (S)-1-(2-methoxy-3-bromophenyl) ethanol as well as a mutant, a coding gene, a plasmid, a genetically engineered bacterium and application of the short-chain dehydrogenase, and belongs to the technical field of biocatalysts. The mutant is obtained by mutating methionine at the 97th site into isoleucine on the basis of a wild type enzyme shown in SEQ ID NO.1 (SEQ ID NO.3). The invention further discloses a preparation method of the short-chain dehydrogenase. The invention also provides a coding gene, an expression vector, a genetically engineered bacterium and a double-enzyme catalytic system containing the mutant and formate dehydrogenase. The system can efficiently and highly selectively catalyze and synthesize the target chiral alcohol under mild conditions, and the conversion rate is gt; 95%, eet; 99% of the method is suitable for green preparation of the key intermediate of the medicine lutrombopag.

The application belongs to the technical field of organic synthesis, and particularly relates to a preparation method of 4-bromocyclopropylbenzene. The method comprises the following steps: in step 1, bromobenzene, a Lewis acid and 3-chloropropionyl chloride are reacted to obtain 4-bromo-3-chloropropiophenone; in step 2, 4-bromo-3-chloropropiophenone and a reducing agent are reacted to obtain 4-bromochloropropylbenzene; and in step 3, 4-bromochloropropylbenzene is reacted under the action of an alkali catalyst to obtain 4-bromocyclopropylbenzene. The method has the advantages that common reagents are used in each step, the cost of raw materials is low, the synthesis process is short, the yield is high, there is no harsh reaction condition, the method is safe, convenient to operate, friendly to the environment, suitable for large-scale industrial production, and has a good application prospect.

The invention discloses a strongly conjugated covalent organic framework material based on a tetrathiophene-anthracene unit as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, reacting and purifying a composition containing 1, 2, 4, 5-tetrabromobenzene for multiple times to prepare ATT; s2, ATT, a pairing reagent and a 6M acetic acid aqueous solution are dissolved in a first solvent for a reaction; when the pairing reagent is TFPPy, COF-ATT is prepared; when the COF-ATTA is TAEPy, COF-ATTA is prepared. Synthesis of two novel COFs with different conjugation degrees is designed based on a tetrathiophene-anthracene structural unit as a raw material, and the two COFs are high in structural rigidity and conjugation degree, have a promoting effect on charge transfer and can improve the conjugation strength of an overall frame structure, so that the light absorption capacity is improved, and rapid transfer of carriers along a molecular skeleton is promoted.