20 results about "Fumarate Esters" patented technology

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.

The invention belongs to the technical field of catalytic synthesis, particularly relates to a method for preparing a nitrogen-containing fused ring compound through quantum dot catalyzed [4 + 2] cycloaddition, and aims to solve the problems of limited product structure and complex reaction system in the existing synthesis method. The synthesis method disclosed by the invention comprises the following steps: in an inert atmosphere, adding 1-phenylpyrrole and fumarate as reaction raw materials, quantum dots as a photocatalyst and an organic solvent into a reaction container, carrying out [4 + 2] cycloaddition reaction under visible light irradiation, and then filtering, concentrating, separating and purifying to obtain the nitrogen-containing fused ring compound. The reaction condition is mild, and the method can be realized by irradiating the quantum dot catalyst with a visible light source at normal temperature and pressure; a reaction system is simple, strong oxidants and additives are not needed, operation steps are convenient, and atom economy is achieved.

The present disclosure provides methods of treating multiple sclerosis (MS) using Compound 1 represented by the following structure, or a pharmaceutically acceptable salt thereof, in combination with dihydroxymethyl fumarate (DRF).

The invention provides a flexible flame-retardant polypropylene cable material and a preparation method thereof. The soft flame-retardant polypropylene cable material is prepared from the following raw materials in parts by mass: 50 to 70 parts of modified polypropylene, 0.5 to 1.0 part of antioxidant, 0.5 to 1.0 part of ultraviolet absorbent and 2 to 5 parts of pigment, wherein the modified polypropylene is obtained by polymerizing a flame-retardant monomer, butyl acrylate and 2-ethylhexyl acrylate; the preparation method comprises the following steps: reacting 9, 10-dihydro-9-oxo-10-phosphine-phenanthrene with fumarate to generate a phosphine flame-retardant intermediate containing a phosphine oxygen group and a diester group; and then grafting the flame-retardant intermediate to a side chain of polypropylene by using a free radical initiator to obtain a high-flexibility flame-retardant polypropylene cable material, and improving the characteristics of difficult dispersion, strong rigidity and the like of DOPO as a flame retardant.

The present invention provides compounds of formula (I),wherein:R1 is unsubstituted C1-C6 alkyl;La is substituted or unsubstituted C1-C6 alkyl linker, substituted or unsubstituted C3-C10 carbocycle, substituted or unsubstituted heterocycle comprising one or two 5- or 6-member rings and 1-4 heteroatoms selected from N, O and S, or substituted or unsubstituted heteroaryl comprising one or two 5- or 6-member rings and 1-4 heteroatoms selected from N, O and S; andR2 and R3 are each, independently, H, substituted or unsubstituted C1-C6 alkyl, or substituted or unsubstituted C6-C10 aryl;or alternatively, R2 and R3, together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heteroaryl comprising one or two 5- or 6-member rings and 1-4 heteroatoms selected from N, O and S or a substituted or unsubstituted heterocycle comprising one or two 5- or 6-member rings and 1-4 heteroatoms selected from N, O and S.The invention also provides pharmaceutical compositions and methods for treating neurological diseases, such as multiple sclerosis.

The application discloses an epoxy resin with high reworkability and a preparation method thereof. The epoxy resin comprises an ester bond, and raw materials for preparing the epoxy resin comprise an epoxy monomer, a curing agent, an accelerator and a liquid transesterification catalyst. The liquid transesterification catalyst is obtained by an addition reaction of an imidazole derivative and a fumarate. The epoxy resin of the application comprises the liquid transesterification catalyst obtained by the addition reaction of the imidazole derivative and the fumarate. The catalyst has high-temperature stability, can maintain a stable structure in a high-temperature curing process, a high-temperature processing process and a service temperature, and avoids high-temperature decomposition and volatilization. In addition, the catalyst is in a liquid state, has good compatibility with the epoxy resin, can be uniformly dispersed in the epoxy resin, is beneficial to a catalytic exchange reaction of a dynamic covalent bond in a high-temperature reprocessing process, and thus excellent reworkability is given to the epoxy resin, and heat recovery and heat reshaping of the epoxy resin are realized.

The present invention relates to a method for synthetizing a polymeric dye by polymerization of polymerizable monomers bearing a polymerizable function, such as as an alkenyl, alkynyl, acrylate, methacrylate, maleate, fumarate or acrylamide or a derivative thereof, and a chromophore function.

The present disclosure is directed to certain polyether esters of di- and tri-carboxylic acid, and methods of making and using the same, such as maleate, fumarate, itaconate, citraconate, mesaconate, citrate, and tartrate, esters of polycitronellol and other polyterpenols. Such products can be prepared from renewable resources and the functional groups can include a wide variety of unsubstituted, substituted, saturated, unsaturated, cyclic, and acyclic molecular structures.

As a solution, the present application provides a gel-like composition containing a vinyl chloride resin and a plasticizer, which is in a gel state at 20°C. The plasticizer is at least one selected from the group consisting of isophthalate esters, terephthalate esters, fumarate esters, acetyl ricinoleate esters, citrate esters, acetyl citrate esters, adipate esters selected from di-2-ethylhexyl adipate (DOA), diisononyl adipate (DINA), maleate esters and their derivatives, and salts thereof. The present application provides an electronic element having a first electrode and a second electrode, and a polymer layer disposed between the first electrode and the second electrode and containing the gel-like composition.

The application belongs to the technical field of material chemistry, and discloses a kind of trans-aromatic fumarate copolymer and its preparation method and application, the trans-aromatic fumarate copolymer has the structure general formula shown in formula (I), and the number average molecular weight is greater than 8000 g / mol;Its preparation method is with phthalic anhydride, 1,8-naphthalene dicarboxylic anhydride or glutamic anhydride and maleic anhydride, propylene oxide is raw material, under the catalysis of 2,6-di-tert-butyl-4-methyl phenol magnesium, with benzyl alcohol as initiator, carry out ring-opening copolymerization reaction to form cis-aromatic fumarate copolymer, then isomerization is obtained, because main chain contains aromatic rigid unit, with high molecular weight, stable structure, high photocuring activity, good mechanical property, biodegradable and other advantages, can be prepared suitable for biomedical field biodegradable photocuring 3D printing photosensitive resin, for bone tissue engineering, personalized implant body and other fields, has good application prospect.

Provided are a novel fumarate monomer, a resin, and a film comprising the same, the fumarate monomer providing a resin having a high T [beta]. The fumarate monomer is represented by the following formula (1). In the formula, R1 represents a linear alkyl group having 1-4 carbon atoms, or a branched alkyl group having 3-5 carbon atoms, and R2 represents a linear alkyl group having 1-4 carbon atoms, a branched alkyl group having 3-12 carbon atoms, or a cyclic alkyl group having 3-6 carbon atoms.

The invention discloses a low-volatility herbicide and a production process thereof, and belongs to the technical field of herbicide preparations. Firstly, composite modified starch containing carboxyl and epoxy groups is prepared through esterification of fumaric acid and graft copolymerization of styrene, butyl acrylate and glycidyl methacrylate; the low-volatility herbicide is prepared by compounding the composite modified starch with a polyether chain segment, synthesizing a fluorosilicone epoxy emulsifier containing a perfluorinated chain, an epoxy group and a polyether chain segment through hydrosilylation, and finally compounding the composite modified starch and the fluorosilicone epoxy emulsifier with an active compound, a solvent and other assistants. By constructing a multi-synergistic system with nonionic emulsification stability, composite starch interface adhesion and fluorosilicone chain hydrophobic protection as the core, the adhesiveness and rain wash resistance of the liquid medicine on leaf surfaces are enhanced, photolysis and volatilization of clomazone are effectively inhibited, the storage stability and application effect of the herbicide are improved, the lasting period of the herbicide is prolonged, and the herbicide has good application prospects. A new scheme is provided for solving the problems of poor stability, unstable pesticide effect and the like of a traditional herbicide.

The present application relates to a kind of oil-permeable water-blocking film-coated quartz sand for fracturing and its preparation method, and the oil-permeable water-blocking film-coated quartz sand for fracturing is three-layer core-shell structure, core is amino silane coupling agent modified quartz sand, middle layer is thermosetting epoxy resin, and outer layer is functional polymer layer;Preparation raw materials of middle layer include epoxy resin A, multifunctional epoxy resin, epoxy resin with double bond and amino resin, the epoxy resin A is selected from at least one in bisphenol type epoxy resin, phenolic epoxy resin;Preparation raw materials of outer layer include (Methyl) propenoic acid C6-C10 alkyl ester, fluorine-containing propenoic acid ester, isobornyl acrylate, dimethyl-diallyl ammonium chloride, bis (3-trimethoxysilylpropyl) fumarate.Solve the defect that the interface bonding force of resin layer and quartz sand matrix of film-coated quartz sand in prior art is insufficient, improve the interface bonding capacity, with excellent oil-permeable water-blocking performance and high temperature and high pressure resistance.

The present invention relates to a polyolefin bearing grafted groups derived from fumarate, its uses and methods of preparation. (no figure)

The invention relates to oil-permeable and water-blocking coated quartz sand for fracturing and a preparation method thereof, the oil-permeable and water-blocking coated quartz sand for fracturing is of a three-layer core-shell structure, the core is amino silane coupling agent modified quartz sand, the middle layer is thermosetting epoxy resin, and the outer layer is a functional polymer layer; the preparation raw materials of the middle layer comprise epoxy resin A, polyfunctional epoxy resin, epoxy resin containing double bonds and amino resin, and the epoxy resin A is selected from at least one of bisphenol epoxy resin and novolac epoxy resin; the outer layer is prepared from the following raw materials: (methyl) C6-C10 alkyl acrylate, fluorinated acrylate, isobornyl acrylate, dimethyl diallyl ammonium chloride and bis (3-trimethoxysilylpropyl) fumarate. The coated quartz sand overcomes the defect of insufficient interface bonding force between the resin layer of the coated quartz sand and the quartz sand matrix in the prior art, improves the interface bonding capacity, and has excellent oil-permeable and water-blocking performance and high-temperature and high-pressure resistance.

A dispersant obtained by reacting polyamidoamine C with at least two polyesters P and at least one carboxylic acid or its anhydride or its ester Q; wherein said polyamidoamine C is obtainable from repetitive self-reaction of at least one type of substance B and / or from cross-reaction of at least one B with at least one substance A, wherein the at least one B is an adduct of the at least one substance A and at least one linker D, and B contains 1-15 amine-reactive groups, the at least one substance A is a branched and / or linear aliphatic and / or cycloaliphatic or aromatic polyamine, and the at least one linker D is an acrylate, a maleate / fumarate mono-ester or a maleate / fumarate di-ester, or a mixture thereof. A process for producing a dispersant, a dispersion, an electrochemical device comprising, and use of the dispersant and the dispersion are also provided.

The present disclosure is directed to certain polyether esters of di- and tri-carboxylic acid, and methods of making and using the same, such as maleate, fumarate, itaconate, citraconate, mesaconate, citrate, and tartrate, esters of polycitronellol and other polyterpenols. Such products can be prepared from renewable resources and the functional groups can include a wide variety of unsubstituted, substituted, saturated, unsaturated, cyclic, and acyclic molecular structures.

A method for purifying bis(3,5-dibromosalicylic acid) fumarate cross-linked tetrameric hemoglobin. The present application relates to the technical field of protein purification, and discloses a method for purifying bis(3,5-dibromosalicylic acid) fumarate cross-linked hemoglobin, which uses an acetic acid-sodium acetate buffer with a pH value of 6.0-7.5 to perform polyethylene glycol fractionation precipitation, and the purity of the purified tetrameric hemoglobin is greater than 95%, and the purity can be further improved when combined with ultrafiltration purification. The purification method of the present application can efficiently and large-scale purify and extract cross-linked hemoglobin from a bis(3,5-dibromosalicylic acid) fumarate cross-linking reaction product solution without a substrate hemoglobin by using common equipment, and is suitable for different production scales and platforms.

The present invention provides fumarate diesters containing fluorine atoms, methods for producing the same, and high molecular weight resins and films obtained from these fumarate diesters. [Solution] For example, a method for producing a fumarate diester represented by the following formula, and a fumarate diester resin containing fumarate diester residue units obtained by polymerizing the obtained fumarate diester. JPEG2026137166000028.jpg33150

A recycled polyolefin film containing a block copolymer of formula (I) in which the polymer A comprises a chain of ethylenic or propylenic structures or an ethylene / propylene copolymer chain optionally interrupted by one or more structural units derived from higher 1-alkene comonomers such as hexene or octene and polymer B comprises a chain of structural units derived from two or more α,β – unsaturated polar monomers selected from unsaturated carboxylic acids, styrene, substituted styrene, unsaturated esters such as acrylate and methacrylate esters, vinyl esters, fumarate esters, itaconate esters, maleic anhydride, unsaturated acids such as acrylic acid and methacrylic acid and diene compounds and derivatives thereof and a process for making the film and a masterbatch for use therein.