10 results about "Free Radical Process" patented technology

The invention belongs to the technical field of organic synthesis, and particularly relates to an alkyl pentafluorosulfenyl compound and a preparation method and application thereof.The preparation method comprises the following steps that in the protective gas atmosphere, in a solvent, SF5Cl serves as a pentafluorosulfenyl source, an olefin compound serves as a reaction substrate and a free radical trapping agent, a thiol compound serves as a hydrogen source, and the alkyl pentafluorosulfenyl compound is obtained through a one-step reaction; under the action of an olefin additive, the alkyl pentafluorothio compound is constructed by a one-step method through a visible light-induced free radical process, and the olefin additive is used for inhibiting generation of a pentafluorothio chloride byproduct from a pentafluorothio source and an olefin compound. According to the method disclosed by the invention, a series of alkyl pentafluorosulfenyl compounds can be prepared by only needing olefin double bonds in substrates and selecting more substrates through the reaction, the reaction is simple, the reaction condition is mild, the reaction can be completed under visible light, the reaction time is short, the implementation is easy, and the method is suitable for industrial production. And a method support is provided for further screening the alkyl pentafluorosulfenyl compound with excellent biological activity.

The application provides an alpha-carboxyl-beta-diimine nickel complex and a preparation method and application thereof and a preparation method of ethylene-methyl acrylate copolymer. The alpha-carboxyl-beta-diimine nickel complex has a structure shown in general formula (I): in the general formula (I), Ar is selected from 2,6-dialkylphenyl; X is chlorine or bromine; and L is acetonitrile or benzonitrile. The preparation method of the alpha-carboxyl-beta-diimine nickel complex is that acetylacetone is reacted with 2,6-dialkylaniline, then reacted with ammonium formate under the action of alkyl lithium, and then reacted with a halogenated nickel salt in an acetonitrile or benzonitrile solvent to obtain the alpha-carboxyl-beta-diimine nickel complex. The application further provides a preparation method of ethylene-methyl acrylate copolymer, which uses the alpha-carboxyl-beta-diimine nickel complex as a main catalyst. The application improves the copolymer molecular weight and the methyl acrylate insertion rate, and makes the prepared EMA similar to the branched structure of a commercial product prepared by a free radical process.

The invention discloses a trans-Markov hydroselenylation method of aryl ethylene, which comprises the following steps: carrying out deoxidation treatment on a reaction flask through a protective gas, and carrying out trans-Markov addition reaction on an aryl ethylene compound and phenylselenol by taking deionized water as a solvent to obtain a trans-Markov hydroselenylation product; the structural general formula of the aryl ethylene compound is # imgabs0 #; the structural general formula of the anti-Martensite hydroselenylation product is # imgabs 1 #. According to the preparation method, deionized water is used as a solvent, in the argon atmosphere, the aryl ethylene compound and the phenylselenol are subjected to anti-Markov addition through the free radical process, the anti-Markov hydroselenylation product is formed, and the yield is high; metal or photocatalysis is not needed, the raw materials are simple and easy to obtain, the reaction is green and mild, the regioselectivity is good, the reaction is carried out under the deionized water condition, the method is environment-friendly, and a simple, effective and atom-economical new way is provided for hydroselenylation of olefin.

The present application relates to a kind of preparation of β-sulfonyl methacrylate compound method. Specifically under the condition of oxidation, end alkyne, sodium organic sulfinic acid under carbon monoxide atmosphere one-pot method is prepared. The present application is widely from substrate, commercially available end alkyne and sodium organic sulfinic acid, under oxidation and without transition metal catalysis, by radical process, obtains a series of β-sulfonyl methacrylate compound.

The present invention discloses an anti-Markovnikov hydroselenation method of aryl ethylene, which comprises the following steps: deoxygenating a reaction flask with a protective gas, using deionized water as a solvent, and performing an anti-Markovnikov addition reaction between an aryl ethylene compound and benzeneselenol to obtain an anti-Markovnikov hydroselenation product; the general structural formula of the aryl ethylene compound is:; the general structural formula of the anti-Markovnikov hydroselenation product is:. The present invention uses deionized water as a solvent, and under an argon atmosphere, the aryl ethylene compound and benzeneselenol undergo anti-Markovnikov addition via a free radical process to form an anti-Markovnikov hydroselenation product with high yield; it does not require metal or photocatalysis, the raw materials are simple and easily available, the reaction is green and mild, has good regioselectivity, is carried out under deionized water conditions, is environmentally friendly, and provides a simple, effective and atom-economic new route for the hydroselenation of olefins.

The invention relates to the technical field of ink, in particular to antioxidant and anticorrosive water-based printing ink and a preparation method thereof. The antioxidant and anticorrosive water-based printing ink is prepared from the following raw materials in parts by weight: 50-80 parts of water-based acrylic resin, 40-60 parts of deionized water, 30-50 parts of pigment, 8-10 parts of an antioxidant material, 5-7 parts of an anticorrosive material, 4-6 parts of a dispersing agent and 3-5 parts of a defoaming agent. According to the water-based printing ink, when the first additive and the phosphite ester in the ink exist at the same time, the phosphite ester can decompose hydroperoxide generated in the oxidation process of the water-based printing ink and hydroperoxide generated in the free radical capturing process of the hindered phenol antioxidant at the same time, and the hydroperoxide is reduced into a relatively stable alcohol compound; the hydroperoxide is prevented from being decomposed to generate new free radicals, so that the oxidation of the ink is further inhibited, and the oxidation resistance of the water-based printing ink is effectively improved.

The invention discloses a method for preparing oxidized starch by accurately controlling oxidation of starch granules, which comprises the following steps: firstly, pre-oxidizing a starch suspension with ozone gas, and then, carrying out pulsed electric field and ozone treatment, so that dissolved ozone molecules are promoted to be decomposed and converted into more active oxygen free radicals with higher oxidation efficiency; further, the advanced oxidation process of the ozone-oxidized starch is realized, so that the production efficiency of the ozone-oxidized starch is improved; meanwhile, the free radical strengthening process is quantificationally controllable by regulating and controlling parameters of the pulsed electric field, free radicals are uniformly oxidized on the surface layers of charged particles under the induction of polarization of the electric field, the oxidation depth of the particles is improved, and the integrity of the starch particle structure is kept on the basis of ensuring that the oxidation degree of starch is improved; and thus, the oxidation effect is accurately controlled. The obtained product can be used as a high-concentration and low-viscosity thickener and binder to be applied to the fields of food, building, papermaking, textile and the like.

The invention discloses a machine learning-based antioxidant prediction system for a resveratrol dimer, and belongs to the technical field of biological antioxidant experiments.The machine learning-based antioxidant prediction system comprises the steps of determining dominant conformation and a reaction mechanism, summarizing and obtaining an antioxidant structure-function relationship and an influence rule of the resveratrol dimer, and predicting the antioxidant structure-function relationship of the resveratrol dimer. The anti-oxidation mechanism module determines an energy channel and an anti-oxidation mechanism of the resveratrol dimer in the process of removing different free radicals, the reliability verification module performs an experiment based on theoretical simulation and verifies the reliability of calculation of the anti-oxidation ability of the resveratrol dimer, and the prediction guidance module determines the anti-oxidation ability of the resveratrol dimer based on the theoretical simulation and the experimental verification result. According to the method, a resveratrol biopolymer antioxidant database is constructed, different machine learning models are adopted for screening, an excellent antioxidant is predicted and guided to be designed according to a screening result, and the method has important practical application value for deep development and utilization of three types of resveratrol biopolymers.

The invention belongs to the technical field of wastewater treatment, and particularly discloses a wastewater treatment method for activating ozone through cooperation of a magnetic field and electricity, which comprises the following steps: (1) placing wastewater in a closed container, and adjusting the pH value to obtain a reaction solution; (2) introducing ozone gas into the reaction liquid and electrifying to carry out electrochemical activation reaction; (3) carrying out an electrochemical activation reaction on the reaction liquid in the step (2) and carrying out magnetic field instantaneous magnetization on the reaction liquid at the same time; and (4) circulating the steps (2)-(3) to the reaction liquid instantly magnetized by the magnetic field until the wastewater meets the standard requirement. The invention combines the advantages of magnetic field, electricity and ozone oxidation, constructs and develops an efficient magnetic field and electricity synergistic ozone activation technology, enhances the process of generating. OH free radicals by electro-activated ozone through magnetization so as to improve the oxidation efficiency and enhance the reaction activity of ozone, realizes efficient degradation of pollutants under actual conditions, and has a wide application prospect. And theoretical basis and engineering guidance are provided for high-concentration degradation-resistant wastewater and deep water treatment.

The invention relates to an aqueous coating composition comprising a first crosslinkable oligomer-stabilized vinyl polymer dispersion DA, a second crosslinkable oligomer-stabilized vinyl polymer dispersion DB and at least one crosslinker X, wherein DA comprises a vinyl oligomer OLA and at least one vinyl polymer PA, said vinyl oligomer OLA and optionally said at least one vinyl polymer PA comprising pendant functional groups which are reactive with the functional groups of the at least one crosslinker X, and pendant olefinically unsaturated functional groups which are crosslinkable by a free radical process; DB comprises a vinyl oligomer OLB and at least one vinyl polymer PB, said vinyl oligomer OLB and / or optionally said at least one vinyl polymer PB comprising pendant functional groups which are reactive with the functional groups of the at least one crosslinker X; the invention also relates to a process for the preparation of said crosslinkable oligomer-stabilized vinyl organic polymer dispersion. The invention also relates to the use of said coating composition for coating a wooden substrate.