12 results about "Undecylenates" patented technology

The present invention relates to a process for the preparation of (4Z)-11,11-dialkoxy-4-undecenyl triaryl phosphonium halides of general formula (3-Z), wherein Y represents a halogen atom, Ar represents independently of each other an aryl group, R 1 and R 2 represent independently of each other a monovalent hydrocarbon group having 1 to 15 carbon atoms, or R 1 and R 2 may together form a divalent hydrocarbon group R 1 -R 2 having 2 to 10 carbon atoms, which process comprises: subjecting a (7Z)-11-halo-1,1-dialkoxy-7-undecene compound of general formula (1-Z), wherein X 1 represents a halogen atom, R 1 and R 2 are as defined above, to a phosphonium salt forming reaction with a phosphine compound of general formula (2), wherein Ar is as defined above, to form said compound (3-Z); and also relates to a compound of general formula (A) L(CH2)3CH=CH(CH2)5CH(OR 1 )(OR 2 )(A), wherein R 1 and R 2 are as defined above.

The invention belongs to the technical field of natural perfume extraction, and particularly relates to a preparation method of trans-2, 4-undecadienal perfume, which is separated and extracted from coriander seeds, and comprises the following steps: step 1, pretreating raw materials, mixing and crushing coriander seeds and sunflower seeds to prepare mixed powder, and preparing a buffer solution; 2, carrying out enzymolysis reaction on the mixed powder to dissolve cell walls, and carrying out enzyme deactivation treatment to obtain a mixed precipitate; 3, performing low-temperature extraction on the mixed precipitate by using a solvent to obtain a mixed solution formed by mixing the solution and the essential oil; and step 4, treating the mixed solution by a column chromatography method to obtain the trans-2, 4-undecadienal perfume. According to the method, the sunflower seeds and the coriander seeds are jointly ground and reacted, so that the material flowability during crushing and enzymolysis can be effectively improved, and the sunflower seeds are rich in alpha-tocopherol which can be used as an antioxidant, so that trans-2, 4-undecylenal is prevented from being oxidized to the greatest extent in the extraction process.

The application relates to the technical field of polymer synthesis, in particular to an initiation / catalyst and a preparation method and application thereof, polylactic acid-poly(malic acid) and a preparation method and application thereof. The application provides an initiation / catalyst, and the preparation raw materials include 4-hydroxymethyl benzoic acid and 1,8-diazabicyclo[5.4.0]undec-7-ene. The initiation / catalyst has the advantage of weakened biological toxicity in biological medicine compared with a metal catalyst which is traditionally adopted.

The application belongs to the technical field of cis-jasmone synthesis, and relates to synthesis of a cis-jasmone intermediate, in particular to a preparation method of (Z)-undec-8-ene-2,5-dione. The preparation method comprises the following steps: acetylpropionyl halide and a dihydroxypyrimidine compound are used as starting materials, and (Z)-undec-8-ene-2,5-dione is prepared according to the following reaction route; a solution of (Z)-3-hexenyl magnesium bromide Grignard reagent is uniformly mixed with a solution of a compound shown in formula 3 under the condition of-15-15 DEG C, the temperature is increased to 15-45 DEG C, reaction is carried out for 1-3 hours, the temperature is decreased to 0-5 DEG C and the reaction is quenched, then the pH is adjusted to 1-3 and the temperature is increased to 15-45 DEG C, and reaction is carried out for 2-3 hours; wherein X1 is halogen, X2 is halogen, and R is H or methyl. The preparation method has the characteristics of easy-to-obtain starting materials, higher proportion of isomer Z configuration, simpler operation and the like, and is suitable for industrialized scale production.

The application relates to a polyimide film and preparation and application thereof, and belongs to the field of advanced functional materials. The preparation comprises the following steps: synthesizing a polyamide acid glue solution from a dianhydride, a diamine monomer and 1,8-diazabicyclo[5.4.0]undec-7-ene phenolate, then performing casting extrusion, solvent evaporation, a chemical cyclization bath, longitudinal stretching, transverse stretching and heat setting to obtain the polyimide film. The polyimide film prepared by the application has a compact and uniform structure and excellent comprehensive performance, and has important application prospects in the fields of artificial graphite heat-conducting films, electricians and electronics.

This invention discloses a method for producing 4-hydroxy-2-pentanone from acetone and acetaldehyde, belonging to the field of fine chemical intermediate synthesis technology. The method uses bio-based acetone and bio-based acetaldehyde as raw materials, and 1,8-diazabicyclo[5.4.0]undec-7-ene as a catalyst. In a DBU-H₂O catalytic system, high-purity 4-hydroxy-2-pentanone is obtained through a cross-aldol condensation reaction followed by separation and purification. This invention solves the technical problems of low product yield, numerous by-products, dark product color, strong odor, and difficulty in catalyst recovery in existing technologies by optimizing reaction parameters and selecting specific catalysts. The reaction conditions are mild, the operation is simple, and the energy consumption is low. The catalyst can be recycled, and all raw materials are bio-based, meeting the requirements of green chemical development. It is suitable for large-scale industrial production, and the product can be widely used in bakelite preparation, flavorings, pharmaceutical intermediates, and other fields.

The invention belongs to the technical field of PET (polyethylene terephthalate) depolymerization catalysts, and relates to a method for generating BHET (butylated hydroxytoluene) by depolymerization based on a DBU-SiO2 catalyst, which comprises the following steps: adding waste PET and ethylene glycol into a depolymerization kettle for alcoholysis depolymerization reaction under the catalysis of an organic-inorganic hybrid nitrogen heterocyclic organic alkali loaded porous silica gel catalyst DBU-SiO2 to obtain a BHET monomer; the preparation process of the DBU-SiO2 comprises the following steps: adding silica gel into ethanol, stirring, adding 1, 8-diazacyclo [5.4. 0] undec-7-ene, carrying out heating reflux, and sequentially filtering, washing and drying to obtain the DBU-SiO2; the conversion rate of the PET polyester is 87.49 to 95.11 percent, and the yield of the BHET monomer is 76.84 to 80.03 percent. According to the method disclosed by the invention, the waste PET is depolymerized by adopting the DBU-SiO2 catalyst, so that the PET conversion rate and the BHET yield are remarkably improved.

The invention provides natural protein shampoo based on an APG surface activity system and a preparation method of the natural protein shampoo, aims at solving the problems that effective microbial communities of existing shampoo are damaged, scalp barriers are damaged, and the anti-dandruff effect is not lasting, and provides a three-dimensional micro-ecological restoration framework of undecylenyl compounds, yeast zinc ZN100 and HA. The microecological friendliness is remarkably improved by targeted inhibition of malassezia proliferation and promotion of growth of scalp effective microbial communities, meanwhile, due to the synergistic effect of an APG surface activity system and undecylenoyl protein, excessive cleaning is avoided while efficient cleaning is guaranteed, a split-phase pre-dispersion and step-by-step cooling method is adopted in the preparation method, the pH value and the viscosity are accurately controlled, and the preparation method is simple and easy to implement. Different undecylenoyl protein different concentration difference formulas are provided according to different types of scalp requirements, the powerful dandruff removing and daily maintenance functions are considered, the shampoo is suitable for people of various scalp types, and the dandruff problem is fundamentally solved.

The invention provides a preparation method of (2S, 4R, 7R, 8R)-3, 3, 7, 11-tetramethyl tricyclo [6.3. 0. 02. 4] undec-1 (11)-ene, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: mixing (1R, 2S, 8R, 11R)-7-methylene-3, 3, 11-trimethyltricyclo [6.3. 0. 02. 4] undecane with a catalyst, and carrying out an isomerization reaction under the conditions of hydrogen and pressurization to obtain (2S, 4R, 7R, 8R)-3, 3, 7, 11-tetramethyltricyclo [6.3. 0. 02. 4] undec-1 (11)-ene. A chemical synthesis method is adopted for preparation, the problem that a target product can only be extracted from natural plants is solved, and the method is environmentally friendly, efficient and free of three industrial wastes.

The invention relates to a polyimide film and preparation and application thereof, and belongs to the field of advanced functional materials, and the preparation method comprises the following steps: synthesizing a polyamide acid glue solution from dianhydride, a diamine monomer and 1, 8-diazabicyclo [5.4. 0] undec-7-alkenylphenate, and then carrying out tape casting extrusion, solvent evaporation, chemical cyclization bath, longitudinal stretching, transverse stretching and heat setting to obtain the polyimide film. The polyimide film is obtained. The prepared polyimide film is compact and uniform in structure and excellent in comprehensive performance, and has important application prospects in the fields of artificial graphite heat conduction films, electrician and electronics and the like.

The invention belongs to the technical field of oil-gas field development, and particularly relates to an integrated clean variable-viscosity fracturing fluid thickener as well as a preparation method and application thereof. The thickening agent is prepared from the following raw materials through polymerization reaction: 16 to 20 parts of acrylamide, 5 to 8 parts of 1-[2-[(1-oxoundec-10-alkenyl) amino] ethyl] 2-sulfonic acid disodium succinate, 3 to 5 parts of tert-butyl-[2-hydroxy-3-[4-(3-oxobutyl-1-ene-2-yloxy) phenoxy] propyl] ammonium bromide, 40 parts of water, 40 to 60 parts of white oil and an emulsifier which accounts for 3 to 5 percent of the mass of the white oil. By reasonably selecting raw material components and optimizing a preparation process, the integrated clean variable-viscosity fracturing fluid thickening agent with functional groups such as amido bonds, benzene rings, carboxylic acid groups, sulfonic acid groups, hydroxyl groups and ammonium groups is successfully prepared; through the synergistic effect of all functional groups, the integrated functions of temperature resistance, salt resistance, tackifying, resistance reduction, sand carrying and low cleaning damage are achieved, the preparation process is stable and controllable, industrial production is easy, and wide application prospects are achieved in unconventional oil and gas field development.

The application discloses an organic-metal skeleton / FeS composite photocatalytic material and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving soluble zirconium salt and 2,5-dimercaptoterephthalic acid into a mixed solution of glacial acetic acid and N,N-dimethylformamide and uniformly mixing; performing first solvothermal reaction on the prepared solution to prepare UiO-66-SH2; adding UiO-66-SH2 and 1,8-diazabicyclo[5.4.0]undec-7-ene into an N,N-dimethylformamide solution of FeSO4 and stirring and reacting at room temperature; adding thiourea into the reacted solution to perform second solvothermal reaction, thereby obtaining the UiO-66-S-FeS-x photocatalytic material. The prepared photocatalytic material has good photocatalytic performance, and when applied to photocatalytic degradation of tetracycline in water, the degradation rate of tetracycline reaches more than 99% after irradiation for 120 min under visible light (300W xenon lamp, greater than or equal to 400nm).