371 results about "Thiol" patented technology

The present invention discloses a class of imide ring-containing dimercapto monomers, imide ring-containing diene monomers and preparation methods thereof, a light-responsive polyimide material and preparation method thereof, and relates to the technical field of light-driven materials. The present invention uses a dibasic acid anhydride as the basic monomer unit, and prepares a dimercapto monomer containing an imide structure and a monomer containing an imide ring-containing diene monomer by reacting with a monothiol compound and a monoalkyne compound, respectively. The two monomers are subjected to a thiol-alkyne click reaction to finally obtain a high molecular weight polyimide. The polyimide obtained by the present invention has excellent solubility, high tensile strength, good heat resistance and light transmittance; the polyimide material is placed under an ultraviolet lamp for uneven photocrosslinking to quickly obtain a light driver with excellent reversible driving performance.

The invention belongs to the technical field of organic synthesis, and particularly relates to an alkyl pentafluorosulfenyl compound and a preparation method and application thereof.The preparation method comprises the following steps that in the protective gas atmosphere, in a solvent, SF5Cl serves as a pentafluorosulfenyl source, an olefin compound serves as a reaction substrate and a free radical trapping agent, a thiol compound serves as a hydrogen source, and the alkyl pentafluorosulfenyl compound is obtained through a one-step reaction; under the action of an olefin additive, the alkyl pentafluorothio compound is constructed by a one-step method through a visible light-induced free radical process, and the olefin additive is used for inhibiting generation of a pentafluorothio chloride byproduct from a pentafluorothio source and an olefin compound. According to the method disclosed by the invention, a series of alkyl pentafluorosulfenyl compounds can be prepared by only needing olefin double bonds in substrates and selecting more substrates through the reaction, the reaction is simple, the reaction condition is mild, the reaction can be completed under visible light, the reaction time is short, the implementation is easy, and the method is suitable for industrial production. And a method support is provided for further screening the alkyl pentafluorosulfenyl compound with excellent biological activity.

The invention provides a method for detecting dichromate radicals based on surface enhanced Raman spectroscopy, and belongs to the technical field of analytical chemistry. Comprising the following steps: mixing a to-be-detected sample with a sulfydryl-containing compound solution, and adjusting to an acidic condition, so that dichromate Cr (VI) and the sulfydryl-containing compound are subjected to an oxidation-reduction reaction; constructing an SERS substrate, namely preparing a ZnO / Ag heterostructure substrate; mixing the suspension of the ZnO / Ag heterostructure substrate with a reaction system to obtain a mixed solution, so that the ZnO / Ag heterostructure substrate adsorbs a sulfydryl-containing compound and enhances a Raman signal; dropwise adding the mixed solution to the surface of a solid carrier, acquiring a Raman spectrum signal by using a Raman spectrometer, and quantifying the Cr (VI) concentration through the change of signal intensity. The method realizes rapid and high-sensitivity detection of Cr (VI), has strong selectivity and anti-interference capability, and is suitable for detection in the fields of environmental monitoring, food safety, pharmaceutical analysis and the like.

Disclosed is a method of synthesizing a compound selected from the group consisting of C-alkyl glycosides, C-alkenyl glycosides, C-heteroaryl glycosides, Se-glycosides and S-glycosides, the method comprising: a. Reacting a natural unprotected sugar with a 2-chloro-1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 The method comprises the following steps: reacting 1, 3-dimethylimidazoline chloride (DMC) and a mixture of heteroaryl mercaptan and trimethylamine (Et3N) in a mixture of water and dialkane to generate heteroaryl glycosyl thioether; b, under the irradiation of a blue light LED, in the presence of Hantzsch ester (HE), 1, 4-diazabicyclo [2.2. 2] octane (DABCO) and DMSO, heteroaryl glycosyl thioether and a reagent are subjected to light-induced cross coupling, and the compound is generated.

The invention relates to a click photocuring material as well as a preparation method and application thereof, and relates to the field of heat-conducting insulating materials. The click photocuring material is prepared from the following raw materials: a photocuring monomer, a bifunctional or polyfunctional sulfhydryl compound, a photoinitiator and a modified heat-conducting particle filler, the click photocuring material is prepared through a thiol-ene click reaction. Compared with a traditional free radical and cation photocuring system, the click photocuring material has the advantages that the problems of oxygen inhibition, initiator residue, volume shrinkage and the like do not exist.

It is an object of the present invention to provide a monomer which can provide a cured product having both high toughness and rigidity. The present invention is a (meth)acrylate (D) which is a reaction product of a thiol compound (A) having two or more mercapto groups; an iso(thio)cyanate compound (B) having two or more iso(thio)cyanato groups; and a hydroxy (meth)acrylate compound (C) having one or more polymerizable groups.

The invention discloses a mercaptan-coated proton exchange membrane fuel cell cathode catalyst slurry, a preparation method and a membrane electrode, and the method comprises the following steps: step 1, dispersing carbon black in a water-alcohol solution and a surfactant to obtain a carbon black solution; 2, respectively preparing a platinum precursor solution and a cobalt precursor solution; 3, mixing the carbon black solution, the platinum precursor solution and the cobalt precursor solution, removing the solvent, and performing thermal reduction in reducing gas to obtain a binary ordered alloy catalyst; the temperature of the thermal reduction ranges from 700 DEG C to 1000 DEG C, and the time ranges from 0.5 h to 2 h. Step 4, dissolving the mercaptan powder in a mixed solvent of deionized water and isopropanol according to a ratio of 1: 1 to prepare a 1wt% mercaptan-containing solution; then, cooling the solution to 5 DEG C until solid substances are completely dissolved; and step 5, fully mixing the catalyst with the prepared mercaptan solution. And step 6, removing excessive mercaptan, and centrifuging the solution at the rotating speed of 10000 revolutions per minute for 10 minutes. And drying the precipitate in a vacuum drying oven for 12 hours to obtain the catalyst. The mercaptan-coated binary alloy catalyst prepared by the method can avoid poisoning effect of sulfonate radicals on Pt, improves expression of catalyst activity, and is helpful for improving performance of a fuel cell.

The present invention relates to a method for producing methyl mercaptan, comprising the following steps: A) methanol is reacted with hydrogen sulfide to form a stream (M), preferably in the gas state, comprising methyl mercaptan, unreacted H2S and possibly sulfur-bearing by-products; B) optionally, said stream (M) is condensed; C) at least one step of purifying said stream (M) is carried out in order to obtain a methyl mercaptan-enriched stream; D) the gaseous effluents resulting from said at least one purification step are recovered, said gaseous effluents comprising at least one sulfur-bearing compound, preferably H2S; E) a gas-liquid extraction of said at least one sulfur-bearing compound, preferably H2S, is carried out using liquid methanol so as to obtain a liquid methanol enriched in sulfur-bearing compound(s), preferably in H2S; and F) optionally, said enriched methanol is used as a reactant for the reaction of step A).

Methods of selectively depositing a passivation layer on a metal surface of a semiconductor substrate are described. Exemplary methods may include exposing the semiconductor substrate having a metal surface and a non-metal surface to a first precursor to form a first portion of the passivation layer on the metal surface, the first precursor including an isonitrile. The exemplary methods may further include exposing the semiconductor substrate comprising a metal surface and a non-metal surface to a second precursor to form the passivation layer on the metal surface. The second precursor may include an amine, an alcohol, or a thiol.

The invention discloses a modification method of end-group-modified polyphenylene sulfide, which comprises the following steps: mixing polyphenylene sulfide prepared by a sodium sulfide method, an organic solvent, a sulfydryl modifier and an organic tin catalyst, and reacting for 1-4 hours at the temperature of 200-300 DEG C to obtain the end-group-modified polyphenylene sulfide, the chemical structural formula of the end group modified polyphenylene sulfide is shown as a formula I, wherein n is greater than 0. According to the invention, isocyanate and a terminal group react under the catalysis of dibutyltin dilaurate to generate thiocarbamate, and the terminal group of polyphenylene sulfide is accurately regulated and modified from the molecular level, so that the solution fluidity of polyphenylene sulfide is improved, and the processability is obviously improved.

The present invention discloses a rapid detection method for sodium polydisulfide (PDPS). The method comprises preparing a buffer solution and an Elma color developer; preparing multiple sets of sodium polydisulfide (PDPS) solutions of different concentrations; pretreating the sodium polydisulfide (PDPS) solutions with an excess of a boron hydride compound as a reducing agent to reduce the sodium polydisulfide to a thiol-containing compound; and removing the excess reducing agent. An absorbance test is performed to establish a standard curve for the concentration and absorbance of the brightener, and the concentration of the sodium polydisulfide (PDPS) in the electrolyte to be tested is measured using the established standard curve. The method uses a boron hydride compound as a reducing agent and utilizes ultraviolet-visible spectroscopy to rapidly detect the content of the brightener, sodium polydisulfide (PDPS). The method is convenient and simple to operate, provides highly accurate test data, and is applicable to the detection of electroplating bath additives in various systems.

The invention discloses a method for repairing cracks of cultural relics, a repairing coating and a method, and relates to the technical field of cultural relic repairing. The preparation method of the repair coating comprises the following steps: step 1, mixing isocyanate and a hydroxyl compound in an inert gas atmosphere, and reacting the isocyanate and the hydroxyl compound under a first reaction condition to generate a first intermediate product; step 2, adding a sulfhydryl compound into the first intermediate product to obtain a mixture, dropwise adding an oxidizing agent into the mixture under a second reaction condition, and reacting the mixture in the dropwise adding process to generate a second intermediate product; and 3, carrying out emulsification treatment and pH value adjustment on the second intermediate product to obtain a waterborne polyurethane dispersion liquid, and sequentially carrying out filtration and solid content adjustment on the waterborne polyurethane dispersion liquid to obtain the repair coating. The repairing coating disclosed by the invention has efficient self-repairing capability, and the repairing coating contains disulfide bonds, so that the repairing coating realizes fracture and recombination under mild conditions.

Methods described herein use benzene sulfonyl azide molecules as scavengers of sulfur species, including H2S, mercaptans, or both in industrial processes such as hydrocarbon production.

Disclosed are methods of curing a composition. The method includes exposing the composition to electromagnetic radiation generated by a laser to cure the composition. The composition includes a thiol-terminated compound and an oxidant. Also disclosed are substrates comprising a coating formed from a composition cured by the disclosed methods.

The preparation method specifically comprises the following steps: S1, respectively dissolving Cd < 2 + > salt powder, sulfydryl molecule powder and alkaline powder in deionized water, S2, mixing and stirring a prepared Cd < 2 + > salt aqueous solution and a sulfydryl molecule aqueous solution in a flask for 3-5 minutes, and uniformly mixing to obtain a primary reaction system; s3, adding an alkaline aqueous solution into the primary reaction system to adjust the pH value, so as to obtain a final reaction system; s4, placing the final reaction system in a magnetic stirrer, heating in a water bath at a constant temperature of 37-90 DEG C, and reacting for 20-120 minutes to obtain a crude product of the cadmium nanocluster; and S5, putting the obtained crude product solution into a dialysis membrane, and dialyzing and purifying in deionized water for 24 hours to obtain the final cadmium nanocluster protected by the sulfydryl molecules. The method is simple, convenient and efficient, the obtained cluster is good in monodispersity, and reference is provided for preparation of the high-performance cadmium nanocluster.

The invention discloses a functionalized polycarbonate material and a preparation method thereof, and belongs to the field of high polymer materials. The material takes carbon dioxide as a green monomer, double-bond active sites are pre-buried in a polycarbonate main chain through ring-opening copolymerization, and carboxyl, amino or heterocyclic functional side chains are efficiently grafted through thiol-ene click reaction. The preparation method comprises the following steps: under the action of a composite catalyst, copolymerizing a double-bond-containing monomer, propylene oxide and COO to synthesize a precursor; and driving the sulfydryl monomer to carry out click reaction through thermal or photo-initiation. The innovation point lies in that the limitation of traditional protection / deprotection is broken through, multiple functions are integrated, hydrophilic carboxyl, antibacterial amino and conductive thiophene group have a synergistic effect, meanwhile, high mechanical strength and controllable degradability are kept, and the preparation method is suitable for the fields of biomedicine and electronics.

The present invention is directed toward a composition comprising: an epoxy compound, a polythiol curing agent, and a second curing agent. Also disclosed are methods of treating a substrate with the composition and substrates formed by such methods.

Methods described herein use benzene sulfonyl azide molecules as scavengers of sulfur species, including H2S, mercaptans, or both in industrial processes such as hydrocarbon production.

The invention discloses a method for efficiently preparing benzo [e] [1, 2, 3] oxathiazide 2, 2-dioxide derivatives with various structures by catalyzing aromatic benzo [e] [1, 2, 3] oxathiazide 2, 2-dioxide and NHC catalytic oxidation cross dehydrogenation coupling of amine, alcohol, phenol, thiol and thiophenol through carbene, and is characterized in that benzo [e] [1, 2, 3] oxathiazide 2, 2-dioxide, a nucleophilic reagent, a carbene catalyst and alkali are used as raw materials for preparing the benzo [e] [1, 2, 3] oxathiazide 2, 2-dioxide derivatives with various structures. The preparation method comprises the following steps: putting benzo [e] [1, 2, 3] oxathiazide 2, 2-dioxide as a raw material, an oxidant and a solvent in an air atmosphere, reacting at room temperature or under a heating condition, removing the solvent in vacuum to obtain a coarse material, and performing silica gel column chromatography purification on the coarse material to obtain the target compound benzo [e] [1, 2, 3] oxathiazide 2, 2-dioxide derivative. The reaction is carried out under extremely mild conditions, the substrate range is wide, and the tolerance of functional groups is good. In addition, the biological activity research of the target compound shows that the compound has the potential of being developed into an effective antifungal agent for crop protection. The compound can be used as a potential candidate drug for inhibiting phytopathogen fungi, and has good research and development value.

The invention discloses a preparation method of an anticoagulant blood contact material, which comprises the following steps: S1, dissolving a silane reagent containing different functional groups by using ethanol, immersing the blood contact material into the silane solution, and reacting for a period of time in a constant-temperature environment in a dark place for later use; s2, immersing the sample obtained in the step S1 in an ethanol solution containing 1mM of TCEP (tris (2-carboxyethyl) phosphine), reacting, fully cleaning, and carrying out vacuum drying for later use; s3, dissolving an anticoagulant with a PBS (Phosphate Buffer Solution) to obtain an anticoagulant solution for later use; and S4, immersing the sample obtained in the step S2 in the anticoagulant solution prepared in the step S3, fully reacting at a constant temperature, cleaning, and drying with nitrogen to obtain the anticoagulant blood contact material. The method is simple to operate, mild in reaction condition, green, economical, free of large equipment and convenient to popularize and use. The silane reagent is used for treating the blood contact material, so that active groups such as sulfydryl, carboxyl, amido and hydroxyl can be generated on the surface of the material in situ, and meanwhile, the hydrophilicity of the material is improved. Then, the functionalized material is immersed in an anticoagulant solution, an anticoagulant drug is fixed on the surface of the material through a mild click chemical reaction, an amidation reaction and the like, and the blood contact material is endowed with excellent anticoagulant performance.

The invention discloses a tellurium-based nano material capable of efficiently inducing copper death as well as a preparation method and application of the tellurium-based nano material. The preparation method comprises the following steps: by taking water as a medium, mixing soluble copper salt and a sulfydryl-containing compound, and stirring to react, so as to obtain a Cu-S2 solution; dropwise adding the Cu-S2 solution into the TeO2 nano-carrier solution, and carrying out stirring reaction; and after the reaction is finished, carrying out solid-liquid separation, taking the solid, and resuspending with methanol to obtain the TeO2 coated Cu-S2 nano material. The preparation method is simple and rapid, large-scale production can be achieved, and the obtained TeO2 coated Cu-S2 nano material can efficiently induce cancer cells to generate copper death, is effective to various cancer cells and has potential clinical transformation application prospects.

The invention discloses a method for removing sulfur-containing compounds in a crude oil-prepared cracked gas C3 fraction. The method comprises the following steps: contacting the crude oil-prepared cracked gas C3 fraction with a supported desulfurizer, wherein the load type desulfurizing agent comprises a carrier and a main active component loaded on the carrier; the main active component comprises alkali metal and / or alkaline earth metal; the carrier comprises elementary substances Ag, Ag2O, elementary substances Re and ReOx; reOx is a mixture of a plurality of Re oxides, x = n / 2, and n is 4, 6 or 7; the molar content of the elementary substance Re accounts for 30-45% of the total molar weight of Re in the carrier. The method provided by the invention can effectively remove low-carbon thioether and / or low-carbon mercaptan in the C3 fraction of the crude oil-prepared pyrolysis gas, has the advantages of low removal temperature, simple process, no additional reaction, no influence on downstream hydrogenation and separation processes, and energy consumption saving, and the desulfurizer can be repeatedly regenerated and used, and has long-period stable operation capability.

The application provides a sulfide compound for inhibiting copper corrosion, and a structural formula of the sulfide compound is as follows: The application adds mercaptan compounds, alkyne and a photoinitiator into ethanol to obtain a mixed solution, then immerses a copper metal sheet into the mixed solution, and under the action of ultraviolet light, a click reaction occurs to synthesize the sulfide compound containing a C-S-C bond, so as to inhibit the corrosion of the copper metal and protect the copper metal, and the sulfide compound has a good effect of inhibiting the corrosion of the copper.

A two-component silicone composition including a component (A) including at least one hydroxyl-terminated polydiorganosiloxane (P); preferably at least one filler; between 0.05% and 5.0% by weight of emulsified water, based on component (A); and a component (B) including at least one noncondensable polydiorganosiloxane (W) as a plasticizer; at least one organosilane (V) as a crosslinker; at least one catalyst (K) for the crosslinking of polydiorganosiloxanes; wherein all organosilanes (V) preferably have the same hydrolyzable alkoxysilane groups, preferably methoxysilane groups; and catalyst (K) is a tin complex having two mercaptide ligands of formula (V), where ligands (L1) are each independently alkyl mercaptides coordinated via sulfur, especially C6 to C16 alkyl mercaptides, where ligands (L1) optionally have methyldialkoxysilane groups, preferably methyldimethoxysilane groups, and ligands (L2) are each independently alkyl ligands, especially C6 to C14 alkyl ligands; and component (B) contains less than 5% by weight of carbon black based on component (B).

This disclosure relates to processes for the synthesis of organic compounds, and more particularly to methods for the synthesis of thioamides from nitriles using a thiol catalyst.

This invention relates to the field of petrochemical catalytic desulfurization technology, specifically disclosing a high-efficiency desulfurizing agent, its preparation method, and its application in the desulfurization of heavy naphtha. The desulfurizing agent provided by this invention has a "two-level" metal active center. The first level is a cobalt center in biochar, and the second level is a nickel-copper bimetallic center introduced through impregnation on the surface of a composite carrier. The desulfurizing agent provided by this invention has excellent desulfurization effect. Under conditions of 140°C and no hydrogen, it can simultaneously remove inorganic sulfur such as hydrogen sulfide and organic sulfur such as thiols, thioethers, and thiophenes from heavy naphtha obtained by hydrocracking of heavy diesel oil, wax oil, or mixed diesel and wax oil, reducing the total sulfur content from 25-40 μg·g. ‑1 Reduced to 0.2 μg·g ‑1 The following methods can effectively protect bimetallic (multimetallic) reforming catalysts from sulfur poisoning, and the preparation process is green and controllable, making it suitable for large-scale industrial applications.

This invention discloses a method for synthesizing disulfide ether compounds using visible light-emitting two-dimensional olefin nanomaterials in synergistic catalysis. The method involves mixing a thiol-containing compound with a suitable solvent, and then, under mild light conditions in the presence of a catalytic amount of two-dimensional olefin nanomaterials, achieving efficient disulfide bond construction to obtain a series of disulfide ether compounds. This invention enables the efficient synthesis of disulfide ether compounds. The catalyst used is simple to synthesize, requires low dosage, and is inexpensive. It achieves efficient conversion under mild light conditions, reducing reaction costs and simplifying post-processing steps. The synthesis reaction in this invention can be carried out at room temperature and pressure without any additional additives, exhibiting mild conditions, rapid reaction, and high yield.

The application discloses a high-brightness quantum dot fluorescent microsphere and a preparation method thereof based on an alkali catalysis strategy, and comprises the following steps: (1) preparing thiol-modified dendritic mesoporous silica microspheres; (2) assembling the thiol-modified dendritic mesoporous silica microspheres and quantum dots to obtain a dendritic silica / quantum dot assembly; (3) adding 3-mercaptopropyl triethoxysilane to the dendritic silica / quantum dot assembly, and performing organic silane modification on the dendritic silica / quantum dot assembly in a non-polar organic solvent by taking an organic alkali as an alkali catalyst; and (4) growing a silica shell layer on the surface of the organic silane-modified dendritic silica / quantum dot assembly by a method to obtain the high-brightness quantum dot fluorescent microsphere. The preparation method avoids fluorescence quenching of oil-phase quantum dots in the process of coating silica, and completely retains excellent optical properties of the oil-phase quantum dots.

The application discloses a method for electrochemically synthesizing oxothiazolazine alkane compounds, which utilizes an electrochemical sulfur and oxygen oxidation method for olefins by using olefin radical cations and diprotic nucleophiles, can synthesize N / S heterocyclic compounds in a single reaction container, utilizes easily obtained thiols and styrene azide, does not need external oxidants or redox catalysts, can synthesize N / S heterocyclic compounds in a single reaction container, and can widen the way of obtaining complex molecular structures for pharmaceutical chemistry and material science.