3082results about "Sulfide preparation" patented technology

Provided are novel benzothiepines, derivatives, and analogs thereof; pharmaceutical compositions containing them; and methods of using these compounds and compositions in medicine, particularly in the prophylaxis and treatment of hyperlipidemic conditions such as those associated with atherosclerosis or hypercholesterolemia, in mammals.

The invention relates to a ketoxime ester photoinitiator, in particular to a ketoxime ester photoinitiator for a photo-curing material. The ketoxime ester photoinitiator has a chemical structural formula as the right, wherein in a R1 structure, n is an integer of between 0 and 5; m is an integer of between 1 and 6; R2 is methyl, phenyl, substituted phenyl, benzyl or substituted benzyl; and R3 is diphenyl sulfide group, substituted diphenyl sulfide group, carbazole group or substituted carbazole group. The ketoxime ester photoinitiator solves the problems of poor application performance and poor thermal stability of the prior OXE-1 ketoxime ester photoinitiator.

The present invention relates to copper-catalyzed carbon-heteroatom and carbon-carbon bond-forming methods. In certain embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-nitrogen bond between the nitrogen atom of an amide or amine moiety and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. In additional embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-nitrogen bond between a nitrogen atom of an acyl hydrazine and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. In other embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-nitrogen bond between the nitrogen atom of a nitrogen-containing heteroaromatic, e.g., indole, pyrazole, and indazole, and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. In certain embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-oxygen bond between the oxygen atom of an alcohol and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. The present invention also relates to copper-catalyzed methods of forming a carbon-carbon bond between a reactant comprising a nucleophilic carbon atom, e.g., an enolate or malonate anion, and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. Importantly, all the methods of the present invention are relatively inexpensive to practice due to the low cost of the copper comprised by the catalysts.

The present invention discloses a class of catalysis systems for preparing highly branched alkanes by using olefins. The catalysis systems comprise a class of novel nickel complexes and palladium complexes. With effects of the catalysis systems, only mild conditions are required to efficiently obtain oily highly branched alkane mixtures by using ethylene and other olefins, wherein the alkane mixtures have a low bromine value, and can be used for processing aids, and high-performance base oil of lubricants,. The present invention further provides a preparation method for catalysts, and a preparation method for oily olefin polymers.

The present invention provides a process for producing methionine which is advantageous from the viewpoints of cost and wastewater disposal, and which comprises the following steps (1) to (5): (1) a reaction step comprising hydrolysis of 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione in the presence of a basic potassium compound; (2) a first crystallization step comprising introduction of carbon dioxide into the reaction solution obtained in step (1) to precipitate methionine, and separation of the resultant slurry into a precipitate and a mother liquor; (3) a second crystallization step comprising concentration of the mother liquor obtained in step (2), mixing with a lower alcohol, introduction of carbon dioxide into the mixture to precipitate methionine and potassium hydrogen carbonate, and separation of the resultant slurry into a precipitate and a mother liquor; (4) a heating step comprising concentration of the mother liquor obtained in step (3) followed by a heating treatment at 150 to 200 DEG C; and (5) a third crystallization step comprising introduction of carbon dioxide into the heated mother liquor obtained in step (4) to precipitate methionine and potassium hydrogen carbonate, and separation of the resultant slurry into a precipitate and a mother liquor.

This invention describes processes for the convergent synthesis of calicheamicin derivatives, and similar analogs using bifunctional and trifunctional linker intermediates.

A sensor is provided including a polymer capable of having an alterable measurable property from the group of luminescence and electrical conductivity, the polymer having an intermediate combination of a recognition element, a tethering element and a property-altering element bound thereto and capable of altering the measurable property, the intermediate combination adapted for subsequent separation from the polymer upon exposure to an agent having an affinity for binding to the recognition element whereupon the separation of the intermediate combination from the polymer results in a detectable change in the alterable measurable property, and, detecting said detectable change in the alterable measurable property.

The invention discloses a photoinitiator containing nitro dioxime ester. The structure of the photoinitiator is represented by a general formula I shown in the specification. The photoinitiator has excellent application properties on the aspects of storage stability, light sensitivity, developing performance, pattern integrity and the like, has good adaptability to single-wavelength UV-LED (Ultraviolet-Light Emitting Diode) light sources and shows light sensitization performance, which is obviously better than that of the existing photoinitiators, under the irradiation of UV-LED.

The invention relates to high base number (TBN400) vulcanized alkyl phenol calcium and a preparation method thereof. The vulcanized alkyl phenol calcium has a chemical structure as right. The preparation method is as follows: in a system containing solvent and diluent oil, alkyl phenol compound, shielded phenol compound, calcium oxide and / or calcium hydroxide and sulfur are subjected to sulfonation / neutralization reaction at a temperature of between 60 and 180 DEG C to generate phenolate intermediate; balanced calcium oxide and / or calcium hydroxide are added into the mixture, carbon dioxide is introduced, and the mixture is subjected to carbonation reaction; and alkyl polylol is added into the mixture at the sulfonation / neutralization reaction or respectively at the sulfonation / neutralization reaction and the carbonation reaction to participate in the reaction, long-chain carboxylic acid is added into the mixture at the sulfonation / neutralization reaction or respectively at the sulfonation / neutralization reaction and the carbonation reaction to participate in the reaction, and products are obtained through refining. The vulcanized alkyl phenol calcium has the characteristics of high base number, low viscosity, low precipitation number, good heat storage stability, and the like, and has excellent combination property, does not cause environmental protection problem during use, and belongs to an environment-friendly product, and adopts a one-stage process, has mild reaction conditions, and is easy to filter.

A compound of formula 1a which is useful for treating reperfusion injury, and salts, prodrugs, and related compounds.

The invention discloses aromatic diamine containing phthalonitrile side group, which is characterized in that the structural formula is shown in the specification, wherein R is one of CF3CCF3, CH3CCH3, O, CO and S. A preparation method of the aromatic diamine containing phthalonitrile side group comprises the following steps of: adding 4-nitrophthalonitrile or 3-nitrophthalonitrile, a compound 1, potassium carbonate and a high-boiling point solvent into a reaction container; conducting reaction for 10-24 hours at room temperature under protection of nitrogen; and then precipitating, filtering and drying. The aromatic diamine containing phthalonitrile side group can be applied to the preparation of polyimide, polyamide and polyamide-imide.