45 results about "Methylmagnesium chloride" patented technology

A process for preparing 2-methyl-4- methylamino-6- methoxyl-1, 3, 5- triazine, realized by reacting magnesium with methyl chloride in ether - aromatic hydrocarbon - alkane mixed solvent to obtain methylmagnesium chloride, then carrying out methylation with cyanuryl chloride, and proceeding methoxylation and methylaminolation with the action of quaternary ammonium salt phase transition catalyst.

The invention discloses a preparation method of mestanolone. The structural formula of the mestanolone is as shown in the specification. The specific preparation method comprises the following steps of (1) generating a compound II with cyan from a compound I and acetone cyanohydrin or sodium cyanide; (2) adjusting a solution of the compound II into acidity, tracking ethylene glycol and triethyl orthoformate into ketal, adjusting the solution into strong basicity to form a compound III; (3) adding a catalyst and hydrogen to the solution of the compound III to generate a compound IV; (4) putting the compound IV into a container and dissolving by using tetrahydrofuran, dropping a Grignard reagent of methylmagnesium chloride or methyl magnesium bromide to obtain a compound V; and (5) elutriating the compound V in the same container under an acid condition to obtain 3-ketal, namely mestanolone. Chemical production of the mestanolone is achieved by adopting the simplest process, the required raw materials are few, the pollutants are few, meanwhile, the produced mestanolone is high in purity and the relative yield is increased.

The invention relates to the field of organic compounds and discloses a preparation method of trimethyl gallium. The method comprises the following steps: enabling a gallium salt and methylmagnesium chloride to react in an organic solvent under the protection of an inert gas, and separating the trimethyl gallium from an obtained reaction mixture. The method shortens the process flow, the electrolytic process with higher energy consumption and the synthesis process of a gallium magnesium alloy are avoided, and the production cost of the trimethyl gallium is remarkably lowered.

The invention discloses an electrochemical polishing method for a magnesium metal component. The electrochemical polishing method comprises the following steps of firstly, putting an anode and a cathode into an organic magnesium electrolyte solution, wherein the anode is the magnesium metal component; and then, applying an electrolysis voltage between the anode and the cathode to obtain a polished magnesium metal component. The organic electrolyte solution comprises a solvent selected from a group consisting of ethyl ether, tetrahydrofuran, 2-methyl tetrahydrofuran and cyclopentyl methyl ether, and an organic magnesium electrolyte selected from a group consisting of methyl magnesium chloride, ethyl magnesium chloride, phenyl magnesium chloride, alkoxy magnesium bromide and alkoxy magnesium chloride. The electrochemical polishing method for the magnesium metal component disclosed by the invention has the advantages of saving time, saving labor, and being suitable for fine magnesium metal components.

The invention discloses a preparation method for 2,3,3,3-tetrafluoropropene. The preparation method comprises the following steps: (a) reacting chloropenta fluoroethane and methylmagnesium chloride in an organic solvent, and after the reaction is ended, performing cooling, filteration and rectification to obtain 1,1,1,2,2-perfluoropropane, wherein the methylmagnesium chloride and the chloropenta fluoroethane are in the molar ratio of 1:(1-5), the reacting temperature is 20 to 60 DEG C, and the reacting time is 1 to 5 hours; (b) introducing the 1,1,1,2,2-perfluoropropane which is obtained in the step (a) into an alkaline liquor at 50 to 90 DEG C, collecting a gas product, and drying and condensing the gas product to obtain the product, namely, the 2,3,3,3-tetrafluoropropene; or performing gas phase catalysis on the 1,1,1,2,2-perfluoropropane which is obtained in the step (a) under the action of a catalyst to remove HF and obtain the 2,3,3,3-tetrafluoropropene. The preparation method for the 2,3,3,3-tetrafluoropropene has the advantages that the process is simple, raw materials are easily obtained, and the cost is low.

The invention relates to a preparation method of methyl-magnesium chloride, belonging to the technical field of preparation method of Grignard reagent. The method is characterized in that: reaction is implemented by taking methyl chloride and magnesium metal as raw materials and methylal as a solvent, wherein the molar ratio between the magnesium metal and the methyl chloride is 1:0.5 to 3, and the weight ratio between the magnesium metal and the methylal is 1:2 to 100. The method carries out the reaction by taking the methyl chloride and the magnesium metal as raw materials and the methylal as the solvent, thus lowering the production cost; furthermore, the recycling of the methylal is easy, thus further lowering the production cost. The raw material can also be prepared from byproducts of glyphosate production, therefore, the source of raw materials are rich, the cost is low, furthermore, the purification and separation cost of the byproducts is reduced, and the production technology is simple and easy, thus having obvious economic benefit.

The invention discloses a synthetic method of ultra-high molecular weight polyethylene. The method comprises the following steps: in water-free and oxygen-free conditions, adding a methyl magnesium chloride Grignard reagent into a carrier, carrying out primary filtration after stirring for 2 to 3 h, after washing a filter cake with a solvent, mixing with TiCl4, carrying out secondary filtration after stirring for 2 to 3 h, and drying the filter cake to obtain a supported catalyst; adding the obtained support catalyst, normal hexane and triisobutyl aluminum into a reaction still, and at the temperature of 50 to 60 DEG C, carrying out an ethylene reaction for 30 to 120 min at 0.5 to 1 MPa to obtain the ultra-high molecular weight polyethylene. The most coomon polyolefin coordination polymerization catalyst Z-N catalyst is loaded by simply using the carrier with a porous structure, and the ultra-high molecular weight polyethylene can be obtained by using the catalyst to catalyze vinyl polymerization.

The invention discloses a preparation method of a fungicide prothioconazole key intermediate of a 2-chlorobenzyl chloride Grignard reagent. Compared with the prior art: in the presence of a catalyst,a methyl magnesium chloride Grignard reagent is added dropwise into 2-chlorobenzyl chloride to conduct Grignard reaction, the method changes a process route and choice of raw materials; a product witha total yield reaching 98 % (based on the 2-chlorobenzyl chloride) is obtained; a preparation process is simple and easy to implement, reaction speed is fast, side reaction is small, a by-product methyl chloride can be recycled to achieve clean and environment-friendly production, and economic benefits are remarkable.

The present invention discloses a montelukast sodium preparation technology and intermediates; 7-chloro-2-methylquinine and 3-bromobenzaldehyde are used as raw materials for condensation reaction to obtain a compound A2; by carbon-carbon coupling of the compound A2 and 1-tetralone in the presence of a catalyst, an intermediate compound A3 is obtained; an important intermediate compound A4 is obtained by bio-enzyme catalyzed asymmetric Baeyer-villiger reaction, a chiral center is highly selectively constructed, an important intermediate compound A5 is prepared from the compound A4 by grignard reaction by use of methylmagnesium chloride, finally montelukast sodium (A6) is obtained; according to the technology, the highly chiral important intermediate compound A4 is obtained by bio-enzyme catalyzed asymmetric reaction, the catalyst can be effectively repeatedly used, and the kind of used solvents is less, and the montelukast sodium preparation technology has the characteristics of safety and environmental protection, greatly saves the production cycle, is low in production cost, high in total yield, and simple in operation of production units, and is suitable for industrialized production.

The invention relates to a preparation method of 4-(1-hydroxy-1-methylethyl)-2-propylimidazolium iodide-5-carboxylate, which belongs to the technical field of pharmaceutical intermediate synthesis. For solving the problems that the content of products is low, and a large amount of organic solvents are required to be adopted for recrystallization, a preparation method of 4-(1-hydroxy-1-methylethyl)-2-propylimidazolium iodide-5-carboxylate is provided. The method comprises the following steps: reacting 2-propylimidazolium iodide-4,5-dicarboxylate with methylmagnesium chloride so as to obtain an oily matter; adding an inorganic acid and activated carbon into the oily matter, and heating the obtained mixture so as to carry out a salt forming reaction, so that the obtained mixture is transferred into a corresponding acidic salt; filtering the acidic salt so as to obtain filter liquor of the corresponding acidic salt; and controlling the temperature of the filter liquor, adding an alkaline reagent into the filter liquor so as to adjust the pH value of the obtained mixture to 7, and then carrying out cooling crystallization on the obtained mixture so as to obtain 4-(1-hydroxy-1-methylethyl)-2-propylimidazolium iodide-5-carboxylate. The method disclosed by the invention is simple and short in process, an organic solvent is not required to be adopted for recrystallization, and the purity and yield of obtained products are high.

The invention discloses a preparation method of a halogen-free rubber foam insulation material. The preparation method comprises the following steps: mixing an ethylene-propylene-diene monomer with ethylene propylene, adjusting the temperature to 110-120 DEG C, and performing a stirring reaction for 20-30 minutes; further adding polyvinyl chloride, polydipentanone and methyl magnesium chloride, adjusting the temperature to 120-125 DEG C, and performing a reaction for 15-25 minutes; further adding polycaprolactone and trioctyl phosphate, adjusting the temperature to 128-132 DEG C, and performing a reaction for 20-30 minutes continuously; adding 2-methyl-6-isopropyl phenylamine, aluminum silicate and azodicarbonamide, and leaving to stand at 135-140 DEG C to react for 30-40 minutes; further performing a stirring reaction for 20-30 minutes at a velocity of 800-900r/minute; cooling after the reaction, drying, and pelletizing, thereby obtaining the halogen-free rubber foam insulation material. The halogen-free rubber foam insulation material prepared by using the method is good in both flame retardancy and heat preservation.

The invention discloses a synthetic method for preparing an olmesartan medoxomil intermediate through continuous flow, which belongs to the technical field of drug synthesis. The method comprises the following steps: step (1), dissolving a compound 2-propyl-4,5-imidazole dicarboxylic acid ethyl ester I in an organic solvent to form a reaction phase A; step (2), taking a commercially purchased methyl magnesium chloride solution as a reaction phase B; step (3), pumping the reaction phase A and the reaction phase B into a mixer by using a plunger pump at a certain flow rate, then feeding the mixture into a reactor, retaining for a certain time, quenching by using an acid water phase C, feeding the mixture into an oil-water continuous liquid separator, separating liquid to obtain an organic solution of a compound as shown in a formula II, desolventizing, and recrystallizing to obtain the compound as shown in the formula II. The technical problems of low purity and high cost in the existing preparation process are solved, the product is high in purity and few in impurities, the content of the key impurity A, the key impurity B and the key impurity C can be controlled to be 0.1% or below, the raw materials are cheap and easy to obtain, the reaction condition is mild, operation is easy and convenient, the synthesis efficiency is high, and the method is suitable for industrial production. A novel continuous flow path is provided for preparing the olmesartan medoxomil and the intermediate.

The invention discloses a synthesis method of 4-isopropylresorcinol. The method comprises the following steps: group protection, Grignard reaction, hydrodeoxygenation and deprotection. According to the method, a novel protecting group halomethyl methyl ether is adopted for protecting phenolic hydroxy, then the Grignard reaction is performed on 3 milliliters of methylmagnesium chloride or methylmagnesium bromide, hydrogenation is performed under low pressure and normal temperature in the presence of acid, and the protecting group is removed with hydrochloric acid to obtain the 4-isopropylresorcinol. The problem of difficulty in treatment after Witting reaction is solved, the temperature and the pressure of hydrogenation reaction are reduced, the hydrogenation time is shortened, deprotectionis finally implemented under a mild condition, and the whole process is a safe production process capable of implementing industrial production.

The invention discloses a method for synthesizing trimethylphosphine oxide and belongs to the field of compound preparation. The method includes: under nitrogen protection, allowing chloromethane and magnesium chips to react in the mixed solution of toluene and tetrahydrofuran by using bromoethane as initiator so as to obtain methylmagnesium chloride; directly adding trichlorine into the methylmagnesium chloride, which needs not to be purified, after cooling, stirring under low temperature to allow for reaction, extracting after the reaction is completed, and performing vacuum refinery distillation and cooling crystallization to obtain the trimethylphosphine oxide. The method has the advantages that the purity of the obtained trimethylphosphine oxide is above 99.5%, the yield of the trimethylphosphine oxide reaches 95%, and the solvent used by the method is easy to recycle.

The invention provides a preparation method of a metandienone product. The preparation method comprises the following steps that 1,4-androstenedione, namely IDD, is adopted as a raw material, in the presence of methylmagnesium chloride, an organic solvent and acid, alpha-CH3 and beta-OH are introduced at the 17 position, and metandienone is prepared; and then the obtained metandienone is heated byactivated carbon in acetone or lower alcohol below C4 for reflow discoloration and is recrystallized, and the metandienone product is obtained. According to the preparation method, the IDD serves asthe raw material to prepare the metandienone, compared with a traditional method adopting diosgenin as a raw material, the raw material source is wide, a process is economic and environmentally friendly, and the production cost is significantly lowered. Compared with a traditional production method, according to the preparation method, a synthesis route is short, the process is easy, convenient and environmentally friendly, the product yield is high, the quality is good, and the production raw material cost is lowered by 40-45% by calculating through the current raw material price.

The invention discloses a preparation method of a montelukast chiral intermediate, which belongs to the field of medical chemical synthesis. The preparation method comprises the following steps of: reacting compound S1 serving as the raw material with methylmagnesium chloride, oxidizing by using manganese dioxide, chlorinating by using NCS (Succinchlorimide), carrying out chiral reduction by using (-)-B-chlorodiisopinocampherylborane, carrying out cyclization under the action of anhydrous potassium carbonate, and carrying out addition reaction with 2-methyl formate benzylmagnesium bromide to obtain the medical intermediate S7. By adopting the preparation method disclosed by the invention, the application of precious metal for catalysis is avoided, the reaction conditions are mild and easily controlled, the reaction product is single, the yield is high, the optical purity and the chemical purity of the product are greatly improved, the process is simple, the raw materials are low in price and easily available, and therefore the preparation method is more suitable for industrial large-scale production.