268 results about "Sulfinic acid" patented technology

A kit for dental adhesive comprising a radical polymerizable monomer having an acid group in the molecule, a photosensitizer and / or a peroxide, a water-soluble organic solvent, an organic sulfinic acid and / or a salt thereof or a barbituric acid and / or a derivative thereof, and water. The kit may further comprises a radical polymerizable monomer which has no acid group and is insoluble or hardly soluble in water, an amine compound, a silane coupling agent and a 1,3,5-triazine-2,4-dithion derivative. By using this kit, the adhesive composition can be applied directly to a dentine without conducting a pretreatment.

A color-stable superabsorbent polymer having long-term color stability, and methods of manufacturing the polymer, are disclosed. The superabsorbent polymer is prepared using a sulfinic acid derivative, like 2-hydroxy-2-sulfinatoacetic acid, a salt thereof, or a mixture thereof, as the reducing agent in a polymerization initiator system for the preparation of a superabsorbent polymer from monomers. The resulting superabsorbent polymer resists color degradation during periods of extended storage, even at an elevated temperature and humidity.

A cobalt-iron alloy film having saturation magnetization of at least about 2.30 Telsa. The film alloy includes about 55 wt % to about 75 wt. % iron and the remainder cobalt. The film is made by a process in which the film is electrodeposited from an aqueous medium which includes one or more ferrous salts, one or more cobaltous salts, a buffer having a pKa of about 6 to about 8, at least one carboxylic acid having a pKa of between about 3.5 and about 5.5, an aromatic sulfinic acid or its salt and optionally, a halide salt and / or a surfactant. The alloy film is useful as a write head in magnetic recording.

By using an organic base when a carboxylic acid bromodifluoroethyl ester is sulfinated by using a sulfinating agent, there is obtained 2-(alkylcarbonyloxy)-1,1-difluoroethanesulfinic acid ammonium salt. By oxidizing the 2-(alkylcarbonyloxy)-1,1-difluoroethanesulfinic acid ammonium salt, there is obtained 2-(alkylcarbonyloxy)-1,1-difluoroethanesulfonic acid ammonium salt. By using the 2-(alkylcarbonyloxy)-1,1-difluoroethanesulfonic acid ammonium salt as a raw material and exchanging it into an onium salt directly or through saponification / esterification, there can be obtained a 2-alkylcarbonyloxy-1,1-difluoroethanesulfonic acid onium salt.

The invention refers to a dental composition kit which comprises a combination of (A) a one-pack primer composition containing (a) an acid group-having polymerizable monomer and (b) an aromatic secondary amine and / or an aromatic tertiary amine, and (B) a cement composition containing (c) a polyalkenoic acid, (d) an ion-leachable glass filler, (e) a polymerizable monomer, (f) water, (g) a peroxide and (h) a salt of an aromatic sulfinic acid. A dental composition kit of this invention is easy to handle, and the cured product of the compositions bonds well to teeth. The kit is useful in restoring decayed or injured teeth and in bonding prostheses to teeth.

The present invention provides a process of a compound of the formula (I): wherein R is heteroaryl or the like, ring A is a heteroalicyclic group or the like comprising reacting a compound of the formula (II): wherein Hal is halogen and the other symbols are the same as the above, in the presence of a sulfinic acid salt and further in the presence of an acid or a salt with an organic base, and a novel crystal form of 2-(3-isoxazolyl)-3,6,7,9-tetrahydroimidazo[4,5-d]pyrano[4,3-b]pyridine phosphate monohydrate.

A color-stable superabsorbent polymer having long-term color stability, and methods of manufacturing the polymer, are disclosed. The superabsorbent polymer is prepared using a sulfinic acid derivative, like 2-hydroxy-2-sulfinatoacetic acid, a salt thereof, or a mixture thereof, as the reducing agent in a polymerization initiator system for the preparation of a superabsorbent polymer from monomers. The resulting superabsorbent polymer resists color degradation during periods of extended storage, even at an elevated temperature and humidity.

The invention relates to a method for visible light catalytic synthesis of a 3-sulfuryl spiro-trienone compound. The method comprises dissolving N-aryl propiolamide and sulfinic acid as raw materials in an acetonitrile / water mixed solvent, adding water soluble eosin as a photocatalyst into the solution, carrying out irradiation on the mixed solution under a 3W blue LED visible light lamp for a reaction at the room temperature for 6-24h, and after the reaction, separating and purifying the crude product to obtain the 3-sulfuryl spiro-trienone compound. The method utilizes a visible light energy source, a simple and easy available sulfinic acid as a sulfone source, cheap water soluble eosin as a photocatalyst and air as an oxidant, realizes synthesis of the 3-sulfuryl spiro-trienone compound at the room temperature, greatly reduces the energy consumption, effectively prevents the use of metal catalysts and peroxide oxidants and has good reaction safety.

The invention discloses a biological deodorant. The biological deodorant is characterized by comprising the following raw materials in percentage by mass: 20%-30% of a complex microbial agent, 40%-50% of organic acid and 30%-40% of calcium superphosphate, wherein the complex microbial agent comprises saccharomyces cerevisiae, bacillus subtilis, germany lactic acid bacteria, nitrobacteria, thiobacillus thiooxidans, acetobacter oxydans and an adsorption material; and the organic acid is selected from one or more of oleic acid, linoleic acid, linolenic acid, arachidonic acid, polybasic carboxylic acid, oxalic acid, malic acid, amino acid, sulfoacid and sulfinic acid. According to the biological deodorant, the original foul gas in garbage can be quickly and effectively adsorbed, removed and covered, the work environment of a worker in a composting plant is improved, composting and stabilizing of organic garbage are accelerated, and novel foul gases such as ammonia and hydrogen sulfide generated and released in the composting process are prevented from being reduced.

An article has a constitution such that yellowing (e.g., yellowing of white portions upon storage in a resin file or the like) of the article can be continuously prevented over a long period of time even when it has a porous site composed of a pigment, such as an alumina hydrate, in an ink-receiving layer. An article, an ink recording medium and an ink-jet recording medium comprising a phenolic compound having a sulfonyl group and a diffusible sulfinic acid salt, and a production process of the ink-jet recording medium are provided.

The invention discloses a synthesis method of aryl-aryl, aryl-alkyl and alkyl-alkyl asymmetric persulfides as shown in a formula (II) or a formula (IV). According to the synthesis method, with sulfinic acid sodium salt, and halogenated hydrocarbon and Na2S2O3 as reaction materials or Bunte salt as a reaction material instead of the halogenated hydrocarbon and Na2S2O3, the aryl-aryl, aryl-alkyl and alkyl-alkyl asymmetric persulfides are obtained by reaction in the absence of transition metal. The synthesis method has the advantages that the reaction is efficient; the yield is high; a vulcanizing reagent is cheap, easily available, stable, and free of pungent smell; no strong acid or alkali or extra oxidizing or reducing agent is added in reaction; the condition is relatively mild; and no transition metal is used as a catalyst in the reaction, and therefore the method is economical, practical and friendly to the environment; a reaction substrate is easy to prepare; the reaction efficiency is high after the reaction is amplified, and therefore, the synthesis method has a wide application prospect and practical value.

The invention discloses a method for brewing fresh litchee juice wine. The method includes that litchi raw material is subject to pretreatment, then super high temperature sterilization and freeze concentration and then ultralow temperature long fermentation, ageing, juice alcoholization, formulation, clarification and filtering, thus obtaining the fresh litchee juice wine. The ultralow temperature long fermentation includes that active dried yeast growing at low temperature and food grade sulfinic acid solution containing SO2 are added into juice after sterilization, the content of the activedried yeast in juice after sterilization is 200-400mg / L; and fermentation is carried out for 20-35 days at 2-12 DEG C. the invention adopts freeze concentration method to improve natural sugar degreeof litchee juice, brewing cost of litchee wine is low, alcoholic strength is high, mouthfeel is full, no exogenous saccharides is required to be added, and natural nutrients and flavor of fresh litchee juice are kept and fine, smooth and elegant litchee wine mouthfeel while stable and permanent litchee fruity can be obtained.

The invention discloses a method for displaying P91 and P92 steel original austenite grain boundaries, which belongs to the field of physical and chemical inspection. A sample which is well ground and polished is subjected to a corrosion method which combines supersaturated picric acid-sodium dodecyl benzene sulfonate (or sodium tridecyl benzene sulfinic acid)-hydrogen peroxide thermal etching and sulfuric acid electrolytic pickling, through utilizing microscope dark-ground illumination or bright-ground illumination of the light polished sample, the P91 and P92 steel original austenite grain boundaries can be displayed. The method disclosed by the invention is safe to operate, low in cost and pollution-free; and by the method, the P91 and P92 steel original austenite grain boundaries can be clearly and completely displayed, the grain size grades of P91 and P92 steel are accurately evaluated, and a basis is provided for material quality control.

One embodiment of the invention provides a dental cement composition which includes (a) an acid group-having polymerizable monomer, (b) a polyalkenoic acid, (c) an ion-leachable glass filler, (d) a polymerizable monomer not having an acid group, (e) water, (f) a peroxide, (g) a salt of an aromatic sulfinic acid, and (h) an aromatic secondary amine and / or an aromatic tertiary amine.

Provided is an inkjet recording medium in which hydrated alumina and a sulfinic acid compound or thiosulfonic acid compound coexist in a pigment in an ink receiving layer, and which can prevent white-background yellowing during storage in a resin file holder or the like and ensure printing quality at the same time. The ink receiving layer of the inkjet recording medium contains the sulfinic acid compound or thiosulfonic acid compound, which functions to prevent yellowing, in a salt form or in a free form so as to be diffusible.

A method of preparing beta-chloroalkenyl sulfone compounds from sulfonates and alkynes is provided. The method includes directly synthesizing the beta-chloroalkenyl sulfone compounds from the sulfonates and the alkynes in a nitrogen or inert gas atmosphere by using an iron halogenide agent. The method adopts raw materials and the iron halogenide agent which are cheap, stable and easily available, and does not use ligands, acids, peroxides, microwave radiation, and other special reaction conditions. Pre-functionalization of a substrate is not needed. The method is mild in reaction conditions, simple in operation, short in reaction time and high in product selectivity, substrate applicability and yield, and has a potential application prospect in the fields of medicines, organic synthesis intermediates, and the like.

The invention discloses a reductive spherical cellulose adsorbent containing sulfinyl and a preparation method of the reductive spherical cellulose adsorbent. The preparation method comprises the following steps of: dissolving cellulose by using ionic liquid, then carrying out graft copolymerization and introducing a reductive group to prepare the reductive spherical cellulose adsorbent with the grain size of 4.5-5.2 mm and the specific surface area of 180-780 m2 / g. The preparation method has simplicity and no toxicity. The reductive spherical cellulose adsorbent has better reductive adsorbability and biodegradation capacity, wide source of a cellulose material and low price, thereby generating better economic and environmental benefits on the aspects of absorbing heavy metal ions and removing chlorine-disinfecting by-products of drinking water.

The invention discloses an aromatic sulfinic acid compound preparation method, comprising using chlorine aluminic acid ion liquid as a catalyst, obtaining aromatic sulfinic acid by an Friedel-Crafts acylation reaction of an aromatic compound and sulfur dioxide. Among the aromatic compounds, benzene series compounds and naphthalene series compounds are preferred. The method of the invention is mild in reaction condition and short in reaction time. The yield of benzene series products is more than 80% and the yield of naphthalene series products is more than 70% and the product content is more than 92%.

The invention discloses a preparation method of sulfonamide, which comprises the step of: under an atmosphere of inert gas, heating sulfinic acid or sulfinate and a nitro compound for 3 to 30 hours at the reaction temperature from 20 DEG C to 200 DEG C by using transition metal or translation metal compound as a catalyst, so as to generate sulfonamide. The preparation method disclosed by the invention has the following technical effects of an improved reaction system and stable properties, low cost and high availability of nitro compound; in this method, the nitro compound is directly used as starting material, thus avoiding the step of selectively reducing nitro into an amino compound; sulfinate is more stable and easier to store than other sulfonating agents; and simultaneously, the reaction system is simple and easy for industrial production. The method disclosed by the invention is safer and more economical and effective than the existing methods, and is also safer in used catalyst; and normally, the method disclosed by the invention can realize the conversion of nitrobenzene raw material into sulfonamide at a conversation rate of 90%, typically above 95%.

The invention relates to a titanium alloy electrochemical oxidation liquid. Every 1 kg of titanium alloy electrochemical oxidation liquid includes the following components: 180-200 g of inorganic acid or organic acid, 50-90 g of cerium salt, 5-8 g of surface active agent and the balance water, wherein the inorganic acid is any one of hydrochloric acid, sulfuric acid and nitric acid, the organic acid is any one of citric acid, carboxylic acid, sulfo acid, sulfinic acid and thionothiolic acid, the cerium salt is any one of cerous sulfate and cerium nitrate, and the surface active agent is sodium dodecyl benzene sulfonate. The titanium alloy electrochemical oxidation liquid has the advantages that the thickening of the titanium alloy surface anodic oxide film is favorable when anode oxidation is performed to the titanium alloy by adopting the titanium alloy electrochemical oxidation liquid, and the performance of the anodic oxide film can be enhanced.

The invention discloses a synthesis method of 7- phenylacetamide-3-chloromethyl-4- cephalsporanic acid p- methoxybenzyl ester(GCLE). The invention takes the penicillin G kali salts mass made in China as starting materials; firstly, the penicillin G kali salts reacts with the p- methoxy benzyl chloride to obtain p- methoxybenzyl ester; secondly, the p- methoxybenzyl ester is oxidized by peroxy acetic acid to obtain penicillin sulfoxide ester; the penicillin sulfoxide ester firstly reacts with the 2- mercaptobenzothiazole, and then reacts with benzene sulfinic acid to obtain ring opening products; the ring opening products reacts with chlorine gases to obtain chlorination products; the chlorination products reacts with ammonia gases to obtain 7- phenylacetamide-3-chloromethyl-4- cephalsporanic acid p- methoxybenzyl ester(GCLE).

The invention relates to a preparation method of an aromatic sulfinic acid compound. The preparation method includes the steps of: with Lewis acid as a catalyst, performing a Friedel-Crafts acylation reaction to an aromatic compound as a raw material with 1,4-diazabicyclo[2.2.2]octane (DABSO) in a solvent to generate a corresponding aromatic sulfinic acid compound. Compared with industrial preparation methods for the aromatic sulfinic acid compound in the prior art, the method can synthesize the aromatic sulfinic acid compound in one step, so that experiment operations are simplified and a high-polluting chlorosulfonation step is avoided. The method has mild reaction conditions, wherein the reaction can be carried out under a common normal temperature condition, so that a large amount of energy consumption in production is reduced. The DABSO, compared with gas-phase SO2, is convenient to store and transport, has stable properties at normal temperature and under normal pressure and has safe and simple operations. The raw materials are low in cost and easy to obtain, thus reducing production cost. The method has huge potential in practical use.

The present invention provides compounds of Formula I: wherein: R1 is a label (e.g., a detectable groups; an anti-tumor agent)s; L is present or absent and when present is a linking group; and x represents an integer from 1 to 10; or a pharmaceutically acceptable salt thereof. the compounds are useful for, among other things, identifying cysteine sulfenic acids in proteins and monitoring oxidative damage in proteins and cells.

An integrated controlled catalytic oxidation process converts low value disulfide oil (DSO) compounds produced as a by-product of a generalized mercaptan oxidation (MEROX) process into oxidized DSO (ODSO) compounds including sulfoxides, sulfones, sulfonates and sulfinates that are completely or partially water soluble and which have utility, e.g., as lubricity additives in diesel fuel and as a solvent in aromatic solvent separation processes.

The present invention provides a preparation process for converting to a vinylidene fluoride elastomer having a group having sulfinic acid, sulfinic acid derivative, sulfonic acid or sulfonic acid derivative at one end or both ends of its trunk chain, and the preparation process provides a vinylidene fluoride elastomer having, at one end or both ends of its trunk chain, end groups represented by the formula: —CR1R2—CR3R4—SO2H, wherein R1 to R4 may be the same or different and each is hydrogen atom or fluorine atom, by allowing a vinylidene fluoride elastomer having, at one end or both ends of its trunk chain, end groups represented by the formula: —CR1R2—CR3R4—X1, wherein R1 to R4 are as defined above, X1 is bromine atom or iodine atom, to react with a sulfur compound represented by the formula: (M1)nH2−nS2O4, wherein M1 is a monovalent or divalent metal ion or ammonium ion, n is an integer of 0 to 2.

The invention relates to an aerobic oxidation system and a photoinduced aerobic oxidation method thereof. The aerobic oxidation system comprises 1) at least one of the following substances 1a)-1d): 1a) sulfinic acid or a derivative thereof; 1b) sulfonic acid or a derivative thereof; 1c) a compound or mixture that can produce sulfinic acid or a derivative thereof by reaction; 1d) a compound or mixture that can produce sulfonic acid or a derivative thereof by reaction; and 2) a molecular oxygen-containing component comprising at least one of oxygen, an oxygen-containing gas and a raw material ofa reaction system capable of generating oxygen molecules in situ. When the aerobic oxidation system is used for an oxidation method, a series of compounds can be subjected to aerobic oxidation at room temperature without adding a photosensitization reagent under an illumination condition to obtain corresponding oxidation products so that the production cost is reduced; in addition, the method cangreatly reduce energy consumption, and thoroughly solves the problem of environmental pollution caused by waste discharge brought by heavy metals and acidic solvents, and the problem of metal residues in the product.

A process for preparing an aqueous emulsion polymer including providing at least one ethylenically unsaturated monomer and a free radical redox initiator system under emulsion polymerization conditions, the redox initiator system including a water-soluble oxidizing agent, a water-insoluble oxidizing agent, and a sulfinic acid, or salts thereof, reducing agent; and effecting the polymerization of at least some of the ethylenically unsaturated monomer is provided. Also provided is a process for reducing the residual ethylenically unsaturated monomer content of an aqueous emulsion polymer.