15 results about "Phenylmethanol" patented technology

The invention discloses a method for preparing a chiral benzhydrol compound through asymmetric hydrogenation of o-amido benzophenone under catalysis of rhodium. The chiral rhodium catalyst is generated in situ from a metal rhodium salt and a chiral phosphine-phosphoramidite ligand in various solvents. Compared with other methods for synthesizing chiral benzhydrol, the method has the characteristics of cheap catalyst, easiness in preparation of chiral ligand, mild reaction conditions, simplicity and convenience in operation, high yield, high enantioselectivity and the like, and can be applied to large-scale preparation of chiral benzhydrol compounds. The method is also suitable for efficient preparation of the rice plant growth regulation inhibitor (S)-Inabenide, the yield can reach 92%, the enantioselectivity can reach 96%, and the method has good industrial application prospects.

A benzotriazole-modified anti-sagging resin, a preparation method therefor, and a coating. The raw materials of the modified anti-sagging resin, calculated by parts by weight, comprise the following components: 60-80 parts of a polymer resin; 5-20 parts of a solvent; 1-3 parts of one or more mixed diisocyanates; and 1-4 parts of benzotriazole containing a primary amine group. The preparation method comprises: S1: mixing a primary amine diphenylmethanol with a portion of the solvent, to prepare a primary amine diphenylmethanol solution of a preset concentration; S2: mixing the polymer resin and the remaining solvent uniformly in a reaction kettle with continuous stirring, maintaining the reaction system temperature at 0-40°C, dispersing the primary amine diphenylmethanol solution prepared in step S1 into the reaction system, adding the diisocyanate(s), and stirring, to obtain the modified anti-sagging resin. By means of a benzotriazole-based UV absorber present in the form of polyurea crystals, the risk of volatilization and incompatibility with a coating are avoided, and this can also enhance the aging resistance of the anti-sagging resin.

The invention provides a preparation method of 2-amino-5-chlorobenzhydrol, and relates to the technical field of medicine synthesis. The method comprises the following steps: dissolving 5-chloro-3-phenyl-2, 1-benzisoxazole in ethanol, reacting with sodium borohydride under the catalytic action of nitrogen-doped porous graphene-silicon dioxide until the content of 2-amino-5-chlorobenzhydrol in a reaction solution detected by HPLC (High Performance Liquid Chromatography) is not lower than 93.5%, stopping the reaction, filtering, and collecting filtrate, thereby obtaining the 2-amino-5-chlorobenzhydrol. And carrying out reduced pressure distillation on the filtrate, cooling, recrystallizing, carrying out suction filtration, and drying to obtain the 2-amino-5-chlorobenzhydrol. According to the preparation method disclosed by the invention, the 2-amino-5-chlorobenzhydrol is synthesized in one step through direct reduction by a one-pot method, synthesis and separation of an intermediate are not needed, and the reaction process is remarkably shortened.

This invention relates to the field of organic synthesis and discloses a method for preparing bifenthrin. The method includes: contacting kungfu acid and 2-methyl-3-phenylbenzyl alcohol in the presence of a catalyst composition to carry out an esterification reaction; wherein the catalyst composition includes component A and component B; wherein component A is selected from oxyacid esters of group IVB elements and / or compounds formed by group IVB elements and alcohols; wherein component B is selected from at least one of inorganic salts of copper, oxides of copper, oxides of tin, and inorganic salts of tin. The bifenthrin prepared by this method has a high yield (>98%), high purity (up to 99.4%), and produces fewer bifenthrin isomers (<0.5%), meeting market requirements. The entire process is highly efficient and environmentally friendly.

The invention provides a preparation process for co-production of methoxyamine hydrochloride and N, O-dimethyl hydroxylamine hydrochloride. Comprising the steps of aminolysis, methylation reaction, extraction separation, primary hydrolysis, distillation, dehydration and recrystallization of a first product, secondary hydrolysis, dehydration and recrystallization of a second product and the like. According to the invention, methoxyamine hydrochloride and N, O-dimethyl hydroxylamine hydrochloride can be prepared at the same time, and reaction conditions can be greatly widened, so that high-efficiency and high-yield production is realized, and meanwhile, the product purity is greatly improved; through the coproduction design, the equipment utilization rate is high, the cost is greatly reduced, the recovery rate of solution substances such as methyl acetate, dichloromethane, toluene, methanol and isopropanol is greater than or equal to 90%, the wastewater is circulated and zero discharged after being treated, only a small amount of common industrial waste salt is used as solid waste, the hazardous waste amount is greatly reduced, and the effect of environmental protection is achieved.

The invention discloses a preparation method of bromodiphenylmethane, and belongs to the technical field of organic synthesis.The preparation method comprises the steps that methylbenzene, hydrobromic acid and benzhydrol are mixed, then sodium bromide is added, then heating reflux reaction, standing liquid separation and refined petroleum ether treatment are conducted, cooling crystallization is conducted, and bromodiphenylmethane is obtained. The invention provides a preparation method of diphenylbromomethane, which is stable in process, safe to operate, environment-friendly and economical in cost. The method successfully solves the common problems of poor atom economy, low reaction selectivity, complicated post-treatment, difficulty in product purification and the like in the traditional bromination process by optimizing the raw material ratio and synergistic effect, accurately controlling the reaction process and adopting an original efficient purification process. The whole process from reaction to purification is optimized, and the method is particularly suitable for industrial production and has remarkable comprehensive benefits.

An aerosol generating material comprising at least two non-tobacco botanical materials, the aerosol generating material produces an aerosol when heated, the aerosol comprising: a first compound selected from the list consisting of: 2-methoxy- phenol, 2-methoxy-4-vinylphenol, vanillin, benzeneacetic acid, phenylethyl alcohol, maltol, and combinations thereof; and a second compound selected from the list consisting of: D-limonene, alpha-terpineol, levomenthol, menthol, 3-methyl butanoic acid, 2-methoxy phenol, terpinene-4-ol, 6-methyl-5-hepten-2-one, 1H-pyrrole-2- carboxaldehyde, alpha-methyl-benzenemethanol, theobromine, octadecanoic acid, n- hexadecanoic acid, methyl-ester-hexadecanoic acid, butyrolactone, caffeine, 9- octadecenoic acid, furfural, 2-methyl butanoic acid, 2,3-dihydrobenzofuran, 2- heptadecanone, and combinations thereof.

The application discloses a PtZn-ZnO catalyst rich in low-potential benzene acid production x The application discloses a catalyst with a PtZn intermetallic compound structure and rich in PtZn-ZnO interface active sites, and a preparation method and application thereof. x The catalyst can significantly promote the oxidation efficiency of biomass-derived alcohol organic small molecules at a low potential (<0.9 V, relative to a reversible hydrogen electrode). x The PtZn-ZnO catalyst is applied to an electrocatalytic benzene methanol oxidation reaction, and benzene methanol can be electrocatalytically oxidized into benzene acid at a low potential of 0.725 V with a selectivity of 99.5%, and the electrocatalytic Faraday efficiency can reach 100%, and the catalyst has high conversion efficiency and excellent product selectivity.

The invention relates to degradable plastic colloidal particles and a preparation method thereof, and belongs to the technical field of degradable plastic. The colloidal particle comprises the following components in percentage by mass: 15-20 wt% of a photosensitive accelerator, 8-12 wt% of a biodegradation agent, 5-8 wt% of a plasticizer, 0.3-0.5 wt% of a compatilizer, 0.3-0.5 wt% of an antioxidant and the balance of polylactic acid. The photosensitive accelerator is prepared by the following steps: reacting 5-hydroxy-2-nitrobenzyl alcohol with di-tert-butyl dicarbonate ester to generate a phenolic hydroxyl group protection intermediate, oxidizing with chromic acid to obtain a carboxyl-terminated intermediate, reducing hydroxyl groups with trifluoroacetic acid, and polymerizing with lactide. According to the biodegradation agent, lipase and glycogen are loaded on silicon dioxide to form a compound, and then the compound is coated with a layer of compact acetalized polysaccharide film which is easy to hydrolyze and resistant to high temperature by adopting a solvent evaporation method. The plastic degradation efficiency can be effectively improved through a constructed'light triggering-biological enhancement 'bimodal synergistic degradation mechanism.

The invention relates to a preparation method of a diphenhydramine hydrochloride impurity A. The invention discloses a synthesis process of 2-(diphenyloxy)-N-methylethylamine hydrochloride, which comprises the following steps: (1) under the catalytic action of a phase transfer catalyst, carrying out chlorination reaction on benzhydrol and hydrochloric acid to obtain a compound IV; (2) carrying out selective substitution reaction on the compound IV and 2-methylethanolamine to obtain a mixture of a compound II and a compound III, and carrying out column chromatography and separation to obtain an impurity II; and (3) carrying out salt forming reaction on the compound II and a hydrogen chloride solution to generate a compound I. The raw materials of the method are simple and easy to obtain, and the product yield and purity are high.

This invention relates to catalysts, preparation methods, and applications for the one-pot catalytic oxidation of primary alcohols to esters using oxygen. The catalyst is a zinc-cobalt composite oxide, denoted as Zn-CoO, obtained by stepwise calcination of a Zn-doped modified ZIF-67 precursor. x The morphology is basically rhombic dodecahedral with a slightly concave surface, and the particle size is 0.8~1.2 μm. The primary alcohol as the reaction substrate is added to the reaction solvent, followed by the catalyst Zn-CoO. x The reaction involves the use of N-hydroxyphthalimide as a co-catalyst, with oxygen introduced into the solution during the reaction. The ester product is then separated after the reaction. This invention exhibits excellent catalytic performance for a variety of typical primary alcohols. The esterification yields are as follows: n-propanol oxidative esterification yield reaches 85.6%, n-butanol 97.0%, cyclohexylmethanol 89.9%, n-octanol 80.8%, and benzyl alcohol up to 96.0%. It demonstrates broad applicability and high selectivity for straight-chain aliphatic primary alcohols, cycloalkyl methanols, and aromatic primary alcohols.

An anti-aging modified anti-sagging resin and a preparation method therefor, and a coating. Raw materials of the modified anti-sagging resin comprise the following components in parts by weight: 60-80.5 parts of a polymer resin; 5-21 parts of a solvent; 1-3 parts of one or more mixed diisocyanates; and 1-4 parts of a primary amino-containing benzophenone. The preparation method therefor comprises: S1: mixing a primary amino diphenylmethanol with a part of a solvent to prepare a primary amino diphenylmethanol solution having a preset concentration; and S2: uniformly mixing a polymer resin and the remaining solvent in a reaction kettle and continuously stirring same, and with a temperature of the reaction system being maintained at 0-40°C, dispersing the primary amino diphenylmethanol solution prepared in step S1 into the reaction system, adding the diisocyanates and then stirring same, to obtain the modified anti-sagging resin. By using a benzophenone-based ultraviolet-light absorber existing in the form of a polyurea crystal, the volatilization risk thereof and the problem of incompatibility with a coating are avoided, and the aging resistance of the anti-sagging resin can also be enhanced.

Disclosed in the present invention are a polysilsesquioxane / polyetheretherketone composite membrane, a preparation method therefor, and a use thereof in organic mixed solvent separation. In view of the existing challenge of large-area deposition of defect-free polysilsesquioxane hybrid membranes on polymer substrates, provided is a novel membrane preparation method using a 1,2-bis(triethoxysilyl)ethane polysilsesquioxane precursor as a raw material for preparing a membrane material. From the perspectives of the simplicity of a membrane preparation process, the industrialization of a membrane separation technology, and the improvement of membrane preparation efficiency, a processing process is designed and optimized, thereby improving the membrane preparation efficiency while maintaining certain separation performance, and exhibiting excellent effects in the separation and recovery of methanol / toluene and methanol / dimethyl carbonate.

The invention discloses a damping and buffering polyurethane insole material and a preparation method thereof, and belongs to the field of polyurethane materials. According to the preparation method, a component A, a component B and a component C are prepared respectively, the component A comprises polyethylene glycol adipate, simethicone and the like, the component B comprises polyethylene glycol adipate, polyoxypropylene glycol and the like, the component C is formed by mixing dimethyl thio-toluenediamine, a functional cross-linking agent and the like, and the functional cross-linking agent is formed by mixing 3, 4, 6-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3 The preparation method comprises the following steps: introducing a hindered phenol group and a dynamic disulfide bond into the raw materials such as 1, 5-di-tert-butyl-4-hydroxybenzyl alcohol; and mixing the three components, performing injection molding, curing and demolding to obtain a finished product. Multiple weak interaction and reversible dynamic covalent bonds are constructed through the functional cross-linking agent, the damping and buffering performance, the rebound resilience and the compression fatigue resistance of the material are synergistically improved in combination with soft and hard segment proportion regulation, and the technical problems that the buffering performance and the rebound resilience of a traditional polyurethane insole are difficult to consider at the same time, and permanent deformation is likely to be generated are effectively solved.