13 results about "Electrophilic substitution" patented technology

This invention belongs to the field of semiconductor packaging, and provides a photosensitive resin, its preparation method, and a photosensitive resin composition. The photosensitive resin is formed by an electrophilic substitution reaction of a phenolic prepolymer and an electrophilic reagent. The phenolic prepolymer is formed by a polycondensation reaction of monomer I (structure shown in Formula 1) and monomer II (structure shown in Formula 2), wherein m and n independently represent 1 or 2, and Ar is an aryl group with 6 to 18 carbon atoms. When this resin is applied to a photosensitive resin composition, the cured material formed by the composition possesses good etching resistance, mechanical properties, and high thermal stability.

The application relates to the field of high-molecular surfactants, and discloses an agricultural high-molecular surfactant and a preparation method thereof. The preparation method comprises the following steps: introducing multiple hydrophilic polyethylene glycol side chains into a sodium lignosulfonate molecule by using an electrophilic substitution reaction to prepare a novel anionic sodium lignosulfonate polyoxyethylene ether, introducing a tetramethylpiperidinamine monomer by using a Mannich reaction to synthesize a novel hindered amine grafted sodium lignosulfonate polyoxyethylene ether, mixing a cationic surfactant hexadecyl trimethyl ammonium bromide with the hindered amine grafted sodium lignosulfonate polyoxyethylene ether to obtain a stable agricultural high-molecular surfactant, and the agricultural high-molecular surfactant has strong surface activity, dispersing performance and photolysis resistance.

The invention discloses a method for synthesizing mesalazine and application of mesalazine. The method comprises the following steps: introducing p-nitrophenol, formic acid and a Cu-Co-coated MFI-NS molecular sieve catalyst into a continuous flow reaction zone, and sequentially carrying out electrophilic substitution and nitro hydrogenation cascade reaction at normal pressure and 50-70 DEG C; the catalyst has a micropore-mesopore stepped pore channel, and contains a Cu0 metal cluster and a framework Co < 2 + > acid site. And separating, acidifying and crystallizing the reaction liquid to obtain a finished product. According to the invention, the shape-selective selectivity and difunctional synergistic effect of the molecular sieve are utilized, high conversion rate (gt, 98%) and high selectivity (gt, 94%) under mild conditions are realized, the product purity is greater than or equal to 99.5%, and the Cu / Co residue meets the ICHQ3D standard. The catalyst can be recycled for 10 times or more, the yield is reduced by 5% or less, iron mud pollution of a traditional iron powder method and the metal leaching risk of a noble metal catalyst are thoroughly eliminated, and the method has the remarkable advantages of being environmentally friendly, efficient, low in cost, easy to industrially amplify and the like and is suitable for preparing the medicine for treating the inflammatory bowel disease.

This invention discloses a method for preparing hyperbranched polyphenylene sulfide-modified nanomaterials. By modifying the ends of mesoporous nanomaterials with amino groups, and reacting the amino groups with acyl halides at low temperature, terminal halogen-modified mesoporous nanomaterials are obtained. Then, polyphenylene sulfide is grown on the surface of the mesoporous nanomaterials through an electrophilic substitution reaction. The resulting nanomaterials are in-situ polymerized with oligophenylene sulfide resin, which greatly enhances the compatibility between the nanomaterials and polyphenylene sulfide resin, while improving the corrosion resistance of thermoplastic resins and extending the service life of thermoplastic resin coatings in geothermal environments.

This invention relates to the field of acyclic or carbocyclic compounds and discloses a method for preparing 6-bromo-2,3-difluorotrifluorotoluene, comprising: dissolving 2,3-difluorotrifluorotoluene in a mixed solvent composed of a polar modifier containing a proton acceptor site and a nonpolar solvent; adding a polyether stabilizer and an iron-based catalyst; and dropwise adding liquid bromine to trigger a directional bromination reaction. The method utilizes the protonated ion-pair complex formed by the in-situ generation of hydrogen bromide and the polar modifier, which, in conjunction with the polyether stabilizer, constructs a sterically hindered shielding structure at positions 4 and 5 of the substrate molecule. This invention forces the electrophilic substitution pathway to be directed towards position 6 of the substrate molecule, overcoming the bottleneck of extremely low positioning accuracy in passivated aromatic ring systems, transforming disordered isomers into a single dominant isomer, thereby reducing separation energy consumption.

The invention provides a preparation method of octabromoS ether, and belongs to the technical field of flame-retardant materials. According to the preparation method, bisphenol S and allyl bromide are subjected to a carbon-oxygen coupling reaction under catalysis of a transition metal compound catalyst, bisphenol S diallyl ether and hydrogen bromide are obtained, hydrogen bromide can be recycled in a subsequent addition reaction, and the cost is saved; then hydrobromic acid and bisphenol S diallyl ether are subjected to an addition-electrophilic substitution reaction under catalytic oxidation of hydrogen peroxide to obtain octabromo-S ether, and high-toxicity bromine is not adopted; hydrogen peroxide is reduced into water in the reaction, so that the method is green and environment-friendly.

This invention discloses a method for preparing a high-power sodium-ion battery hard carbon anode material: N,N-dimethylformamide, phosphorus oxychloride, and lignin powder are mixed in an anhydrous closed stirring apparatus under an inert atmosphere, heated to 75-83°C and stirred, then filtered to obtain filter residue rich in imine organic compounds; then added to deionized water and stirred, filtered to obtain formylated lignin powder; the formylated lignin powder is then subjected to high-temperature carbonization under an inert atmosphere to obtain the high-power sodium-ion battery hard carbon anode material. This invention also discloses a sodium-ion battery containing this hard carbon anode material. This invention utilizes the aromatic compounds in lignin to carry out electrophilic substitution reactions, thereby increasing the reversible adsorption of Na on the surface of the hard carbon anode material. + Oxygen-containing groups and oxygen atoms, when doped, will increase the number of active adsorption sites in the material, increase the interlayer spacing, improve the rate performance of the material, and also increase the specific capacity of the material.

The invention provides a deuterated dicarbazole compound and a preparation method thereof, and belongs to the field of organic photoelectric materials. The bicarbazole compound and the deuterated trifluoromethanesulfonic acid heavy water solution are mixed, the strong acidity of the deuterated trifluoromethanesulfonic acid is utilized to provide enough deuterium positive ions, the deuterated trifluoromethanesulfonic acid and aryl in the bicarbazole compound form an extremely unstable sigma-complex (aryl positive ions), the fracture strength of C-H is much smaller than that of C-D, and the stability of the compound is greatly improved. The deuterated dicarbazole compound has the advantages that one hydrogen atom is quickly lost to recover a stable aromatic system, so that the deuterated dicarbazole compound is obtained, only H-D electrophilic substitution is involved in the process, generation of other impurities is avoided, and the yield and the purity of the deuterated dicarbazole compound are improved; the yield of the deuterated dicarbazole compound is further improved by increasing the number of times of the deuteration reaction.

A method for preparing multi-component polymers through post-polymerization modification, used to functionalize polysulfonyl imidate polymer including a dispersing polymer reactant, an electrophilic substitution reagent and a catalyst in an organic dispersant; adding acid-binding agent to react at room temperature for 4-48 h; obtaining the precipitate when the reaction finished; washing and drying the precipitate to get the functionalized multi-component polymers.

The present application relates to a kind of organic-inorganic hybrid monolithic material containing bipyridine and preparation and CB [5] and CB [7] separation. Specifically, first using tetramethoxysilane and 3-chloropropyl trimethoxysilane as silane reagent, urea and polyethylene glycol-10000 as porogen, after hydrolysis reaction of silane reagent, copolymerization is carried out into the silica gel monolithic material with chlorine atom, then through electrophilic substitution reaction modification 4,4-bipyridine, obtain a kind of organic-inorganic hybrid monolithic material containing bipyridine. Using the difference between CB [5], CB [7] and host-guest interaction of bipyridine, the selective separation of CB [5] and CB [7] is realized. The method used in the present application process is simple, organic solvent is used less, green and environmental protection, can be applied to large-scale preparation high-purity CB [5] and CB [7], with good commercialization prospect.

The application discloses a display photoresist color paste dye molecule with high light resistance, solvent resistance and migration resistance and a synthesis method thereof, and the synthesis method comprises the following steps: (1) an aromatic electrophilic substitution reaction: coupling reaction of phthalic dinitrile with dihydric alcohol, dihydric amine or dihydric acid, post-treatment, and obtaining an intermediate A; (2) a cyclization reaction: cyclization reaction of a salt with the intermediate B, post-treatment, and obtaining the photoresist color paste dye molecule. The application provides a phthalocyanine dye molecule containing a macrocyclic structure, and the phthalocyanine dye molecule is applied to preparation of a display photoresist color paste, and after film formation, the phthalocyanine dye molecule exhibits excellent high light resistance, solvent resistance and migration resistance. Compared with a phthalocyanine dye molecule without a macrocyclic structure, the solvent resistance and the migration resistance are significantly improved; in addition, the phthalocyanine dye color paste has the advantages of high weather resistance, high solubility, high transmittance, high contrast, high color strength and the like.

This invention discloses a heavy metal chelating flocculant possessing both dual chelating groups, its preparation method, and its application. First, a polyethylene polyamine undergoes a nucleophilic addition reaction with carbon disulfide in the presence of a base, thereby forming a -CSS... － The acetate group is introduced at the non-terminal position of the polyethylene polyamine molecule, and then, under strongly alkaline conditions, undergoes an electrophilic substitution reaction with a haloacetate to introduce acetate groups at both ends of the molecule, thus giving the molecule both -CSS and ethyl acetate groups. － and —N(CH2COO) － 2. Two strong chelating groups. The two chelating groups in the molecule complement each other, working synergistically to significantly improve the chelation and binding ability and flocculation and precipitation performance of various heavy metal ions, achieving efficient removal of multiple heavy metals in one step. This invention overcomes the shortcomings of common chelating agents, such as single functional groups, weak chelation ability for some ions, and limited applicability; the preparation process is simple, the reaction conditions are mild, the operation and control are easy, the process is environmentally friendly, and it is easy to realize industrial production.

The application discloses a polyether ketone ketone preparation method, a polyether ketone ketone and an application. The method comprises the following steps: (1) mixing raw materials at a first temperature, wherein the raw materials comprise acyl chloride, a solvent, a Lewis base, diphenyl ether and a Lewis acid, and after heat preservation, the temperature is increased to a second temperature to perform a first reaction stage; (2) increasing the temperature to a third temperature to perform a second reaction stage; and (3) adding a terminating agent to the reaction mixture of step (2). The temperature increasing rate in the step (1) and the step (2) is independently 0.1-5 ℃ / min. The weight average molecular weight of the polyether ketone ketone prepared by the method is between 5000-200000, and the molecular weight distribution coefficient is between 2.5-4.5. The polyether ketone ketone with a narrow molecular weight distribution is obtained through an electrophilic substitution path.