52results about How to "Good optical selectivity" patented technology

There is provided a layered color filter which can improve optical selectivity, without reducing optical transparency, an organic EL light emitting device on which such a layered color filter is mounted, and a fabrication method of such an organic EL light emitting device. The layered color filter includes a substrate 60, a red color filter 40R1, 40R2, a green color filter 40G1, 40G2, and a blue color filter 40B1, 40B2, 40B3 disposed on the substrate 60. In the layered color filter, the organic EL light emitting device on which such a layered color filter is mounted, and the fabrication method thereof, at least one color filter among the red color filter 40R1, 40R2, the green color filter 40G1, 40G2, and the blue color filter 40B1, 40B2, 40B3 is laminated to be formed as a plurality of thin film layers.

The invention discloses a method for preparing chiral 2-chloro-3,4-difluorophenethyl alcohol. According to the method, 2-chloro-3,4-difluoroacetophenone is used as a substrate, and ketoreductase is used for catalytic reduction of the substrate so as to generate the chiral 2-chloro-3,4-difluorophenethyl alcohol. Amino acid sequence of the ketoreductase is as shown in the SEQ ID NO.1-21. 2-chloro-3,4-difluoroacetophenone which is cheap and easily available is used as the substrate, and the biocatalyst ketoreductase is adopted so as to carry out an asymmetric reduction reaction to obtain 2-chloro-3,4-difluorophenethyl alcohol with high chiral purity. The method has advantages of high yield, mild reaction condition and simple operation. Problems of a chemical reduction method, such as strict reaction condition, complex preparation of a catalyst, high cost, inflammable property and low chiral purity of the product, are avoided. The method has good practical industrial application value.

The invention relates to a method for preparing (2S, 3R)-2-benzyloxy-3-pentanol as an intermediate of posaconazole, The method comprises the following steps of directly protecting hydroxyl group of S-ethyl lactate with the benzyl chloride, carrying out a Grignard reaction to obtain (2S)-2-benzyloxy-3-pentanone and directly carrying out a chiral reduction with BH3 to obtain (2S, 3R)-2-benzyloxy-3-pentanol in the presence of a chiral catalyst, wherein the S-ethyl lactate, which is wide in source and low in cost, is used as a starting material. The method disclosed by the invention has the advantages of reduction in reaction steps, improved yield, effectively saved cost, low cost of raw materials, environmental protection, less pollution, wide source of S-ethyl lactate as the starting material, low price, relatively mild reaction conditions, high yield and greatly reduced cost. The products prepared by the method has high optical selectivity, ee values greater than 99%, purity greater than 99% and less impurities and can be used directly without purification.

The invention provides a novel preparation technology of a tasimelteon intermediate namely (1R,2R)-(2,3-dihydrobenzofuran-4-yl)cyclopropyl formic acid. The technology comprises the following steps: (1) carrying out reactions between 2,3-dihydrobenzofuran-4-formaldehyde and malonic acid in the presence of piperidine to generate 2,3-dihydrobenzofuran-4-acrylic acid; (2) converting 2,3-dihydrobenzofuran-4-acrylic acid into acyl chloride in the presence of thionyl chloride, then reacting the acyl chloride with L-menthol to generate 2,3-dihydrobenzofuran-4-acrylic acid L-menthol; (3) carrying out reactions between 2,3-dihydrobenzofuran-4-acrylic acid L-menthol and dimethyl sulfur oxide in the presence of sodium hydroxide to generate (1R,2R)-(2,3-dihydrobenzofuran-4-yl)cyclopropyl formic acid L-menthol; (4) hydrolyzing the (1R,2R)-(2,3-dihydrobenzofuran-4-yl)cyclopropyl formic acid L-menthol in the action of a sodium hydroxide water solution so as to obtain the (1R,2R)-(2,3-dihydrobenzofuran-4-yl)cyclopropyl formic acid. The novel preparation technology is developed on the basis of the conventional technologies, and has the advantages of easily-available raw materials, low cost, simple operation, and suitability for industrial massive production.

The invention relates to a ZnO quantum dot-based deep UV sensor and a preparation method thereof. A superfine ZnO quantum dot network structure serves as an active photoelectric response layer; the ZnO quantum dot-based deep UV sensor is prepared after the preparation of ZnO quantum dots. In the prior art, the switching of photocurrent is very slow due to oxygen adsorption and desorption generating on the surface of ZnO, and an effective Schottky-barrier is difficult to be designed in a device. The novel ZnO quantum dot-based deep UV sensor is designed through a simple and low-cost self-assembling process has the advantages that the problems in the prior art are solved; the spectrum selectivity is high; the optical switch action is stable; the photocurrent responsiveness is high; the response speed is high; the photocurrent switching characteristic is remarkable, fast and stable; the photocurrent on-off ratio is larger than 103; both the photocurrent rising time and decaying time are shorter than 1s; the response speed of the UV sensor is increased.

The invention belongs to the technical field of preparation of light conversion films, and provides a photothermal conversion plastic film for building with a microporous structure, and a preparationmethod of the photothermal conversion plastic film. According to the preparation method, a film is made by adding a light-transmitting agent and aerogel into polyvinyl alcohol resin, and the film having a photothermal conversion effect is prepared by uniaxially stretching. Since the light-transforming agent and polyvinyl alcohol are incompatible systems and the stress orientations are different ina stretching process, the film, which is stretched under the assistance of the aerogel, forms the microporous structure around the light-converting agent, the light is reflected and refracted for a plurality of times in micropores of the film, and the photothermal conversion efficiency is further increased. Compared with the traditional method, the photothermal conversion plastic film prepared bythe method is high in photothermal conversion efficiency and has higher optical selectivity and tensile property; furthermore, the whole preparation process is simple, lower in cost and little in pollution to environment, thus being widely popularized and applied.

The invention relates to a heterogeneous catalyst used in an asymmetric catalytic hydrogenation reaction of Alpha-keto ester, and the preparation as well as the application thereof, and belongs to the technology field of a chemical catalyst and synthesis. The expression of the catalyst is Pt/FDU-14; when in preparation, platinic chloride or Tetrammine platinum (2) Chloride is used as an active component precursor, and FDU-14 is used as a carrier; part of catalyst precursor is vacuum-roasted in a muffle furnace after insuccation and torrefaction, and finally the catalyst precursor is deoxygenized in sodium formate water solution to prepare the heterogeneous catalyst, wherein, the dispersion degree of active component platinum on the surface of the FDU-14 is 0.14 to 0.35, the loading of metallic platinum is 5.0 percent, and the mean particle size of platinum particles ranges from 3.2 to 8.0nm. When the heterogeneous catalyst is used in the asymmetric catalytic hydrogenation reaction of ethyl pyruvate under the room temperature and the medium hydrogen pressure, high activity and optical selectivity more than 70 percent are obtained in acetic acid solution, and the heterogeneous catalyst can be repeatedly used for more than 15 times.

The invention discloses a chiral alpha-amino acid derivative and a preparation method thereof. The structural formula of the chiral alpha-amino acid derivative disclosed by the invention is of formula I shown in the specification. The preparation method of the derivative comprises the following steps: mixing a carbonyl compound with a N,O-acetal mixture, a chiral primary tert-diamine organic small molecule catalyst, strong acid and weak acid, and performing a reaction, thereby obtaining the chiral alpha-amino acid derivative. The chiral alpha-amino acid derivative comprises aldehyde and/or ketone. The chiral alpha-amino acid derivative disclosed by the invention is prepared under catalysis of the chiral primary tert-diamine organic small molecule catalyst of a simple structure via one-step synthesis without solvent, thus being simple and efficient.

The invention belongs to the field of solar energy selective absorption anti-reflection materials, and particularly relates to a thermal sprayed coating anti-reflection protective layer applicable toselective absorption of medium and high-temperature solar energy and a preparation method of the thermal sprayed coating anti-reflection protective layer. The thermal sprayed coating anti-reflection protective layer consists of an inner layer and an outer layer which are compounded, wherein the inner layer is prepared from 40 weight percent of a high-absorption Co3O4-CoAl2O4 thin film, and the outer layer is prepared from 20 weight percent of low-absorption Co3O4-CoAl2O4. The thermal sprayed coating anti-reflection protective layer prepared by the preparation method disclosed by the inventionnot only has excellent optical selectivity, but also can relieve the stress action of the coating in a thermal treatment process, reduce the porosity of a thermal sprayed coating and increase an absorption-emission ratio of the coating, is relatively high in thermal stability at high temperature, also achieves protection, connection and anti-reflection effects, and is compact in structure and stable in performance.

The present invention relates to an esterase, its DNA, its overexpression and a method for preparing an optically active aryl propionic acid of formula (1) using the same in high yield,

wherein R₁ represents an aryl group; and R₂ represents a hydrogen atom.

A Rhodococcus sp.D12 is obtained by screening from soil, separating and purifying. Its optimized culture condition including kind of inductor, nitrogen source, carbon source, inducing period and dosage of inductor is also disclosed. Said strain can be used to catalytically hydrolyzing the nitrile compound into carboxylic acid and amide or their mixture.

The present invention relates to a preparation method for a chiral intermediate for use in statins, acquired with chloroacetic acid and benzyl alcohol as starting materials via a series of reactions, namely etherification, condensation, substitution, and asymmetric reduction. The preparation method provided in the present invention has a novel route of synthesis, allows an intermediate compound to be introduced conveniently into the chiral center of a glycol via enzyme reduction, and not only is low in costs, but also is reliable in quality. The route of synthesis provided in the present invention uses raw materials of low costs, has an easy to operate process, and provides a final product of great purity and high yield.