14 results about "Methyl benzoate" patented technology

The application relates to a preparation method of a benzylamine compound and belongs to the field of organic synthesis. The preparation method of the benzylamine compound is as follows: a reaction formula is shown in the description. The application also provides a preparation method of the compound of the above formula (VI). Compared with methyl o-bromomethylbenzoate used in the prior art, methyl o-chloromethylbenzoate used in the application is cheaper, has lower preparation cost, less pollution and is more environment-friendly. Compared with the prior art, the benzylization reaction of the application has higher reaction conversion rate, less dibenzyl impurities, is convenient for product post-treatment and purification, has higher yield, and has better product quality.

The objective is to provide a fragrance composition that has high reproducibility of the fragrance of forsythia flowers and excellent palatability. [Solution] The forsythia flower fragrance composition comprises (A) methyl salicylate and / or ethyl salicylate, (B) methyl benzoate and / or ethyl benzoate, and (C) linalool and / or limonene, wherein the total content of component (A) and component (B) is 50 to 90% by mass, and the mass ratio (A / B) is 1 to 10.

The application discloses a preparation method of 1,2-propylenediamine, which comprises the following steps: (1) 2-phenyl-5-methyl-2-oxazoline, ZIF-8 catalyst and liquid ammonia are added into a high-pressure reaction kettle, and after temperature rising, stirring and filtration, benzoyl 1,2-propylenediamine is obtained; (2) the benzoyl 1,2-propylenediamine obtained in the step (1), methanol and an alkali metal catalyst are added into an atmospheric pressure reaction kettle with a reflux device, after temperature rising and stirring, sulfuric acid is added to neutralize the alkali metal catalyst, after neutralization, the mixture is filtered, and the filtrate is subjected to distillation to obtain a mixture of methyl benzoate and 1,2-propylenediamine; (3) the mixture obtained in the step (2) is separated by rectification to obtain 1,2-propylenediamine products. The preparation method can reduce the production cost, the process condition is relatively mild, hydrogen is not needed to participate in the amination reaction, the process safety is higher, the raw material conversion rate is high, close to 100% conversion, the synthesis yield is higher than 90%, the preparation process is efficient and safe.

The present application relates to the technical field of corrosion inhibitor, and proposes a thiourea modified imidazoline corrosion inhibitor and a preparation method thereof, which comprises the following components by weight: 40-50 parts of thiourea modified imidazoline, 6-8 parts of isopropyl alcohol, 0.1-0.2 parts of potassium iodide, 10-15 parts of an additive, and 35-40 parts of a solvent; the additive is composed of 2-amino-5-iodobenzoic acid methyl ester and a surfactant. Through the above technical solution, the problem of low corrosion inhibition rate and fast corrosion speed of the thiourea modified imidazoline corrosion inhibitor in the prior art is solved.

This invention relates to the field of seawater desalination technology, specifically to a high-permeability and selective reverse osmosis membrane and its preparation method. The high-permeability and selective reverse osmosis membrane is obtained by sequentially immersing a porous support layer in an aqueous solution and an oil solution for interfacial polymerization, thereby forming a desalination layer on the surface of the porous support layer. This invention increases the compatibility of the water / oil phases by adding N-methylpyrrolidone to the aqueous phase and methyl benzoate to the oil phase, thereby reducing the surface tension of the two phase solutions, promoting the diffusion of amine monomers into the organic phase, and altering the surface morphology and polymer chain aggregation state of the separation layer. This results in a higher roughness and cross-linking degree of the desalination layer, and improved permeability and selectivity.

This invention relates to the fields of fine chemicals and polymer materials technology, specifically a method for manufacturing toy adhesives. It includes steps for preparing the adhesive base material, preparing borax solution, and cross-linking molding. Polyvinyl alcohol, guar gum, methylparaben, etc., are prepared as base materials, which are then reacted with borax solution to undergo a cross-linking reaction. The core of this invention is the strict limitation of specific high-temperature ranges and constant-temperature stirring times during the base material preparation process, which promotes the complete extension and entanglement of molecular chains, constructing a dense and uniform three-dimensional network structure. This invention effectively avoids microscopic particle residue and stress concentration, achieving a significant improvement in the tensile strength, elongation at break, and resilience of the toy adhesive.

The application discloses a kind of 4-methyl 4-hydroxybenzoate organic single crystals and preparation method and application thereof, and relates to the technical field of organic crystal.The method comprises uniformly dispersing 4-methyl 4-hydroxybenzoate polycrystal material in acetone, then removing impurities and insoluble substances by filtration to obtain a filtered solution;the filtered solution is placed at 0-5℃ for 12-48 hours to obtain 4-methyl 4-hydroxybenzoate organic single crystals.The application effectively overcomes the problems of poor crystalline quality, small crystal size, complex process and high equipment requirement in the growth of existing 4MHB crystals by combining low-temperature solvent evaporation method with low-temperature seed crystal method, thereby realizing the growth of large-size and high-quality 4MHB single crystals.

The present application relates to a kind of 2-methoxy-4-acetylamino-5-iodobenzoic acid methyl ester preparation method, steps include: S1, by p-aminosalicylic acid and acetic anhydride reaction, preparation 4-acetylamino salicylic acid;S2, by the 4-acetylamino salicylic acid and dimethyl sulfate reaction, preparation 2-methoxy-4-acetylamino benzoic acid methyl ester;S3, by the 2-methoxy-4-acetylamino benzoic acid methyl ester and iodine reaction, preparation 2-methoxy-4-acetylamino-5-iodobenzoic acid methyl ester.The preparation method of the present application is compared with prior art, and reaction step is shortened to three steps, and total yield is as high as 70% or so;While the yield of iodine substitution reaction is increased from 29% to more than 90%.

This invention discloses a method for synthesizing 3-hydroxyisobenzofuran-1(3 H A new process for methyl 2-formylbenzoate involves the catalytic oxidation of methyl o-methylbenzoate to obtain methyl 2-formylbenzoate, followed by hydrolysis, purification, and refining to yield 3-hydroxyisobenzofuran-1(3-methyl benzoate). H )-ketone. The catalytic system of this synthesis scheme has better synergistic effect, requires less catalyst, has a shorter reaction time, milder reaction conditions, avoids the use of bromine, is more environmentally friendly, and the starting materials methyl o-methylbenzoate and oxygen are also inexpensive and readily available.

The application discloses a preparation method of moveltion and an intermediate, and belongs to the technical field of medicine preparation. The method is characterized in that a key intermediate is prepared by reacting 3-halogenated methyl benzoic acid or 3-halogenated methyl benzoate as a starting material, and then the substituent of the intermediate and a nitrogen protection group are removed to obtain moveltion. The method has the advantages of short process route, high yield, reduced total cost, mild reaction condition, simple post-treatment and suitability for industrial production. The yield of the prepared moveltion reaches 47%, and the purity is more than 99%.

This invention discloses an ortho-methyl benzoate-alkylthiophene copolymer and its preparation method, belonging to the technical field of thiophene copolymers. The structural formula of the copolymer is shown, wherein R is selected from alkyl groups with 4 to 12 carbon atoms. This ortho-methyl benzoate-alkylthiophene copolymer has an electron donor-electron acceptor (D-A) structure, and methyl benzoate is connected to alkylthiophene through ortho and meta positions. Its steric hindrance, to a certain extent, disrupts the perfect coplanarity of the molecular chain. This moderate disorder helps to alleviate the oxidation and loss of dopants and improve its stability.

The application provides a synthesis method of a 4-cyano-2-fluoro-5-methyl benzoate method, relates to the technical field of organic chemical synthesis, and comprises the following steps: raw material 5-fluoro-2-methyl benzonitrile is added into methanol under the condition that the temperature is room temperature; then, a catalyst, 1,1-bis(diphenylphosphino) ferrocene palladium dichloride dichloromethane complex and triethylamine are added into the reaction solution; the reaction is carried out under the condition that the carbon monoxide gas pressure is 15 psi and the temperature is 60-70 DEG C until the reaction is completed; after the reaction is completed, the reaction solution is poured into water; the aqueous phase is extracted with ethyl acetate; the organic phases are combined and washed with saturated brine; the obtained mixture is dried with anhydrous sodium sulfate, filtered, and spin-dried and columned to obtain a product; the synthesis method has a short process route, the raw material and auxiliary materials are cheap and easy to obtain, the reaction activity is high, the operation is simple and easy to control, the yield of the obtained target product is high, and the method is convenient for industrial amplification.

The application discloses a kind of meta methyl benzoate-alkyl thiophene copolymer and preparation method thereof, belong to thiophene copolymer technical field, the structural formula of the copolymer is as shown in, wherein R is selected from one of alkyl of carbon atom number 4~12.Metastatic methyl benzoate-alkyl thiophene copolymer has electron donor-electron acceptor (D-A) structure, and methyl benzoate is connected with alkyl thiophene through meta, can keep the planarity of copolymer and the electron-deficient characteristics of methyl benzoate unit, be favorable to charge transport in polymer molecule, and realize high concentration doping, high-efficiency charge transport between polymer and dopant.