88 results about "Dithiete" patented technology

The invention discloses a fine desulfurization method for liquid hydrocarbon. The method includes steps: a) removing hydrogen sulfide; b) removing carbonyl sulfide; c) removing mercaptan; d) water washing for alkali removal; e) removing disulfides; f) removing residual sulfurs. The method has advantages that 1) aiming at liquid hydrocarbons including liquefied gas, carbon 3, carbon 4, carbon 5 and the like containing different forms of sulfurs, MDEA (methyldiethanolamine) liquid and a fiber film contactor are adopted for extraction to realize hydrogen sulfide removal, and the hydrogen sulfide removal rate is larger than 99.9%; 2) the fiber film contactor and a carbonyl sulfide removing agent which is capable of hydrolyzing carbonyl sulfide and absorbing hydrogen sulfide generated in hydrolysis are adopted for extraction to realize carbonyl sulfide removal, and the carbonyl sulfide removal rate is larger than 99%; 3) by adoption of the complete desulfurization process, total sulfurs in liquid hydrocarbons can be reduced below 1ppm.

The invention relates to the technical field of fine chemical engineering, and discloses a method for preparing asymmetric disulfide. The preparation method comprises the following specific steps: taking 3-methylthio-N-phenylpropionamide and diphenyl disulfide as raw materials, taking N-fluorobisbenzenesulfonamide as an additive, and preferably carrying out a reaction in an acetonitrile solvent under a heating condition so as to obtain a target product, namely the symmetric disulfide N-phenyl-3-(phenyldithioalkyl)propionamide. The method is simple and convenient to operate and mild in reaction, 3-methylthio-N-phenylpropionamide and symmetric diphenyl disulfide are used as reaction raw materials, the asymmetric disulfide product is efficiently synthesized in one step, the use of a thiol rawmaterial with unpleasant smell or a transition metal catalyst is avoided, and the method has a potential application value.

The invention relates to a method for synthetizing mono-thioether compound. The technical scheme adopted by the invention is as follows: in the presence of carbon monoxide and water, disulfide compound and halogenated hydrocarbon compound are used as raw materials, selenium is used as catalyst, organic base or inorganic base is used as cocatalyst or any cocatalyst is not added, the raw materials react in organic solvent at 20-100 DEG C under atmospheric pressure for 1-24 hours, the product is cooled to the room temperature, then carbon monoxide is displaced by air, stirring is performed for 0.2-2 hours, filtration is performed, distilled water and cyclohexane are used to extract the filtrate, and the solvent in the extract liquor is distilled out through reduced pressure distillation to obtain the target product. The method is convenient and safe to operate, adopts one-pot reaction, has common raw materials, no pollution, high selectivity and high yield; and the catalyst can be separated and recycled after the reaction.

The invention belongs to the technical field of chemical synthesis, and provides a method for preparing a balosavir intermediate. The method comprises the following steps: (1) methylating 3,4-difluorobromobenzene to obtain a compound A-1; (2) reacting the compound A-1 with a Grignard reagent, then introducing carbon dioxide gas for reaction, and adding acid for acidification to obtain a compound A-2; (3) brominating the compound A-2 to obtain a compound A-3; (4) adding diphenyl disulfide and a reducing agent 1 into THF, dropwise adding methanol, dropwise adding the compound A-3, and reacting to obtain a compound A-4; (5) carrying out ring closing reaction on the compound A-4 in polyphosphoric acid to obtain a compound A-5; and (6) reducing the compound A-5 into alcohol by adopting a reducing agent 2 to obtain a compound A-6. According to the method, highly toxic and foul thiophenol is prevented from being used while expensive reagents are prevented from being used, so that the processcost is reduced. The invention also provides an intermediate compound prepared by the method.

One aspect of the invention provides a method for generating a C-S bond by decarboxylating an active ester compound. The method comprises the following steps: under an illumination condition, active ester with a general formula of Ra-COONPhth and disulfide with a general formula of Rb-S-S-Rc are subjected to the following reaction: Ra-COONPhth + Rb-S-S-Rc -> Ra-S-Rb in a liquid environment provided by an organic solvent containing organic alkali under the catalysis of a photocatalyst, wherein in Ra-S-Rb, Ra and S atoms are bonded through C-S, the photocatalyst is Ru(bpy)2Cl2.6H2O, and Rb and Rc are independently selected from one of alkyl, optionally substituted alkyl, polyheterocycle or optionally substituted polyheterocycle, and both Rb and Rc are aromatic groups. The selectable range of reactants in the reaction is wide, and alkyl sulfides with various structures can be prepared through the reaction.

The invention provides a synthesis method of a baloxavir marboxil intermediate. The invention provides a synthesis method of a compound (III), which is prepared through three steps. The yield is improved, and the production is easy to control. At the same time, a synthesis method of a compound (IV) is provided. According to the synthesis method, the compound (III) and disulfide diphenyl carry outone-pot self-catalytic circulation reactions to generate the compound (IV). The invention provides a method for preparing a baloxavir marboxil intermediate (VIII) through the reactions mentioned above. Through the one-pot self-catalytic circulation reactions, thiophenol, which is strongly toxic and is strictly controlled, is not used, a safe baloxavir marboxil synthesis method is provided, and thesynthesis method is suitable for industrial production.

The invention discloses a method for synthesizing a 11-sulfenylnaphtho[2,3-b]benzofuran compound. The method is characterized in that 2-ethyleneoxyphenylacetylene and thiosulfonate are used as substrates, disulfide is used as an additive, Na2-Eosin Y is used as a photosensitizer, and light-irradiation stirring is performed under inert gas and heating conditions to obtain the product 11-sulfenylnaphtho[2,3-b]benzofuran. The method has the advantages of no need for transition metal addition in reactions, simple operation, considerable yield, environmental protection performance and good application prospects.

The invention discloses a preparation method of diphenyl disulfide compounds. The preparation method comprises the following steps: stirring an isopropyl magnesium halide Grignard reagent and a substituted halogen benzene compound in an organic solvent at -78 DEG C to -20 DEG C for 30-90 minutes to obtain a thoroughly halogen-magnesium exchanged substituted phenyl Grignard reagent; and adding dichlorodisulfide into the reaction system, slowly heating to room temperature after the reaction is finished, quenching the reaction by using a saturated ammonium chloride aqueous solution, extracting byusing ethyl acetate or diethyl ether, drying by using anhydrous magnesium sulfate, and concentrating the organic phase to obtain the diphenyl disulfide compounds. According to the method, the diphenyl disulfide compounds are prepared by taking the phenyl Grignard reagent as a raw material through a one-pot method, and has the following advantages: the synthetic route is short, the preparation process is simple, the cost is low, the operation is easy, the yield is excellent, and the industrial production is easy.

The invention relates to a method for synthesizing an alpha-fluorinated thioacrylamide derivative. The method comprises the following steps that: with trifluoroacrylamide taken as a reaction substrate, disulfide as a sulfur source, cuprous iodide as a catalyst, potassium carbonate as alkali, triphenylphosphine and water as additives and tetrahydrofuran as a solvent, the components are stirred andreact with one another for 12 hours at 80 DEG C; and after the reaction is finished, a reaction liquid is filtered, a solvent is removed from filtrate by using a rotary evaporator, so that residues can be obtained, column chromatography separation is carried out on the residues by using a silica gel column, leaching is performed with eluent, effluent containing a target product is collected, the effluent is merged, a solvent is removed through vacuum concentration, so that the target product is obtained. The method has the advantages of simple and easily available raw materials, relatively mild reaction conditions, novel and simple preparation process, less pollution and low energy consumption.

Provided are an etching fluid that is capable of suppressing side etching while not impairing the linearity of copper wiring, a replenishing fluid for the same, and a method for forming copper wiring. This etching fluid is a copper etching fluid characterized in being an aqueous solution containing acid, oxidizing metal ions, and a compound (A), the compound (A) having in molecules thereof an amino group and at least one sulfur-containing functional group selected from the group consisting of thiole groups, sulfide groups, and disulfide groups (where the sulfide and disulfide groups are groups in which the sulfur atoms and the heteroatoms linked thereto are linked by a single bond, and which do not form π conjugates).

The invention belongs to the field of polyurethane adhesives, and relates to a heat-detachable polyurethane hot melt adhesive, preparation raw materials, and a preparation method and a bonding method of the heat-detachable polyurethane hot melt adhesive. The preparation raw materials for the detachable polyurethane hot melt adhesive comprise a polyol compound, a polyisocyanate compound, a sulfur-containing compound and a catalyst in a mass ratio of 100: (35-120): (2.5-150): (0.1-2), wherein the sulfur-containing compound is at least one selected from 2,2-dithiodiethanol, 4,4-dihydroxy diphenyl disulfide, 4,4-diaminodiphenyl disulfide and liquid polysulfide resin. The polyurethane hot melt adhesive prepared from the raw materials can be completely detached at a high temperature and cannot be automatically separated at the high temperature, so the aim that a bonded part can be detached under a heating condition is perfectly fulfilled.

The invention relates to a preparation method and application of 6-fluoroquinazoline derivatives containing disulfide structures. The compound has a structure as shown in a general formula (I) which is described in the specification. According to the invention, 6-fluoroquinazoline is taken as a parent structure, disulfanyl (heterocyclic) structures are introduced into a system, so a series of 6-fluoroquinazoline derivatives containing the disulfide structures are synthesized; and the series of compounds have a very good inhibition effect on plant pathogenic bacteria such as rice bacterial leaf blight, ralstonia solanacearum, Pseudomonas syringae pv. actinidiae, Xanthomonas axonopodis pv. citri and the like.

A preparation method of a disulfide compound 3,3'-dithiodipropionic acid comprises the steps of: subjecting the raw materials of sodium hydrosulfide, acrylonitrile, iodine solution and acid to Michael addition, acidification, oxidation and hydrolysis; and recrystallizing and purifying to obtain the disulfide compound 3,3'-dithiodipropionic acid. Compared with the prior art, the method has the beneficial effects of safety, simpleness, green, environment-friendliness, simple technology, high yield and low production costs.

The invention discloses dynamic crosslinking degradable epoxy resin and a preparation method and high-temperature leaking stoppage application thereof. The preparation method of the dynamic crosslinking degradable epoxy resin comprises the following steps that an epoxy monomer, a curing agent and an auxiliary are heated, mixed, heated and cured, a solid product is obtained, the epoxy monomer is a monomer containing 2-4 epoxy groups, the curing agent is anhydride, polyamine and/or a curing agent containing disulfide bonds, and the auxiliary is a solvent. The auxiliary agent is at least one of zinc acetate, acetylacetone, 1, 8-diazabicyclo [5.4. 0] undec-7-ene, diphenyl disulfide, phenol, 2-amino-2-methyl-1-propanol and ethylene glycol amine. According to the invention, the dynamically cross-linked (dynamic sulfur-sulfur bond and dynamic ester exchange bond cross-linked) epoxy resin is prepared to prepare the high-temperature leaking stoppage material capable of being used at 150-210 DEG C, and the obtained material can be gradually degraded at high temperature and lose pressure-bearing leaking stoppage capability, so that the purposes of self-plugging removal and leakage layer protection are achieved.

The invention belongs to the field of organic synthesis, and particularly relates to a photocatalytic synthesis method of a thioether compound. The method comprises the following steps: adding a carboxylic acid compound, a non-toxic and odorless vulcanizing reagent disulfide compound, a photocatalyst and alkali into a solvent, reacting under inert gas protection and illumination conditions, and after the reaction is finished, performing post-treatment to obtain the thioether compound as shown in the formula. According to the method, reagents and substrates are simple, economical, cheap and easy to obtain, thiophenol reagents with pungent odor in a traditional process are abandoned, and a coupling reaction of C-S bonds is completed through decarboxylation by utilizing a metal-free visible light catalysis system. The method is simple in reaction operation, mild in condition, efficient in reaction and good in substrate adaptability, coupling of various substrates with different groups can be achieved, the C-S bond compound is selectively and efficiently constructed in one step, and the compound has great application prospects in medicine synthesis intermediates and has very important significance in construction of complex sulfur-containing compounds.

The invention relates to a preparation method of diaryl disulfide. The method comprises the following steps: reacting halogenated aromatic hydrocarbon with magnesium powder to generate a Grignard reagent, adding sulfur powder, and carrying out a reaction under the action of an acid and an oxidant to obtain the diaryl disulfide. The aromatic disulfide is synthesized by using the cheap and easily available halogenated aromatic hydrocarbon as a synthesis raw material, and then reacts with the magnesium powder to generate the Grignard reagent, and the Grignard reagent reacts with the sulfur powderunder the action of the acid and the oxidant to obtain the diaryl disulfide. The whole method has the advantages of realization of direct synthesis without heavy metal catalysis or complex ligands inthe process and midway discharging, environmental friendliness, high conversion rate, high yield, high purity, simple process, convenience in operation, and suitableness for large-scale production.

The invention belongs to the field of fine chemical engineering, and relates to a method for catalytically synthesizing an asymmetric disulfide derivative by NFSI. The method comprises the steps of adding NFSI, symmetric disulfide A and symmetric disulfide B into a sealed tube containing a reaction solvent 1, 2-dichloroethane, reacting at the temperature of 25-80 DEG C for 1-8 hours, ending the reaction, and separating and purifying to obtain the asymmetric disulfide derivative, wherein the molar ratio of the NFSI to the symmetric disulfide A to the symmetric disulfide B is 0.1: 1.0: 1.0. According to the method, the asymmetric disulfide derivative can be efficiently synthesized without using an expensive rhodium metal catalyst and odorous mercaptan.

The invention belongs to the technical field of organic compound process application. The invention discloses a synthesis method for constructing a three-dimensional and large-steric-hindrance disulfide compound (III). In a reaction solvent, N-dithiophthalimide (I) and ester (II) with alpha hydrogen are used as reaction raw materials, lewis base or cinchona base is used as a catalyst, and variousthree-dimensional and large-steric-hindrance disulfide compounds (III) with quaternary carbon centers are obtained at a high yield under a specific temperature condition. The synthesis method providedby the invention has the advantages of easily available and cheap raw materials, simple reaction operation, mild reaction conditions, high yield and good functional group tolerance. According to theinvention, disulfide connection and modification of some drug molecules, biological small molecules and fluorescent molecules are realized, some chiral disulfide compounds are obtained, a rapid and stable connection mode is provided for connection of pharmaceutical chemistry, especially ADC drugs, and the compounds are expected to be widely applied in the field of pharmaceutical chemistry.

The invention discloses a method for catalytic synthesis of disulfide compounds by using an alkaline zeolite molecular sieve, and belongs to the field of green organic fine catalytic synthesis. According to the method for synthesizing the disulfide-containing compound by using a thiol compound as a substrate, aromatic thiol, aliphatic thiol and heterocyclic thiol are subjected to self-coupling reaction in a nitrogen atmosphere under the condition of no oxidant and metal through ETS-10 zeolite molecular sieve solid base catalysis and sulfur hydrogen bond activation. Finally, a series of disulfide compounds are obtained. The method is simple in step, high in product yield and easy to separate and purify.