79 results about "Nitroxyl radicals" patented technology

The present invention relates to a battery comprising at least a positive electrode, a negative electrode and an electrolyte as composing elements, wherein the positive electrode and/or the negative electrode comprise an active material of nitroxyl radical compound represented by the following general formula (1) as a starting material or a reaction product of at least a discharge reaction of electrode reactions: wherein Ar represents substituted or unsubstituted aromatic heterocyclic group containing nitrogen wherein one endocyclic nitrogen atom or at least one of plural endocyclic nitrogen atoms exists as N-oxide; the substituent R1 represents hydrogen atom, halogen atom, hydroxyl group, nitro group, nitroso group, cyano group, carboxyl group, substituted or unsubstituted alkyl group, substituted or unsubstituted alkenyl group, substituted or unsubstituted cycloalkyl group, substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic heterocyclic group, substituted or unsubstituted aralkyl group, substituted or unsubstituted amino group, substituted or unsubstituted alkoxy group, substituted or unsubstituted aryloxy group, substituted or unsubstituted alkoxycarbonyl group, substituted or unsubstituted aryloxycarbonyl group, or substituted or unsubstituted acyl group, wherein one or more of the atoms may be substituted with sulfur atom, silicon atom, phosphorus atom or boron atom; R1 may be the identical with Ar and a ring structure may be formed between R1 and Ar.

The invention relates to a composition comprising cellulosic fibres having an average degree of substitution of anionic groups of from 0.001 to 0.25, and DEG a length weighted mean fibre length up to 1,100 [mu]m and a length weighted mean fibre width over 10 [mu]m, or DEG a length weighted mean fibre length up to 1,100 [mu]m, and wherein at least 50 % by weight of the cellulosic material is insoluble in water, or DEG a length weighted mean fibre length / width ratio up to 30, or DEG a length weighted mean fibre width over 35 [mu]m. The invention also relates to a composition comprising cellulosic fibres having a specific surface area of at least 1.5 m2/g, a length weighted mean fibre length / width ratio up to 30, and a dry solids content of at least 5 % by weight, based on the weight of the composition, or up to 30 % by weight, based on the total weight of the cellulosic fibres, of cellulosic fibres with a length weighted mean fibre length up to 100 [mu]m. Method of producing a composition comprising cellulosic fibres which comprises subjecting cellulosic fibres to chemical treatment and mechanical treatment, wherein the chemical treatment comprises treating cellulosic fibres with (i) at least one agent containing a carboxyl group, optionally substituted, (ii) at least one oxidant and at least one transition metal, or (iii) at least one nitroxyl radical, and the mechanical treatment comprises subjecting cellulosic fibres to extrusion with a twin-screw extruder or a planetary roller extruder. The invention also relates to a method of producing a composition comprising cellulosic fibres which comprises subjecting cellulosic fibres having an average degree of substitution of anionic groups of from 0.001 to 0.25 to extrusion. The invention also relates to a composition comprising cellulosic fibres obtainable by the methods, a process for producing a cellulosic pulp mixture which comprises mixing the composition with cellulosic pulp, a cellulosic pulp mixture obtainable by the process, and the use of the composition and cellulosic pulp mixture as an additive in the production of paper and board, processes for producing paper and board in which the composition or cellulosic pulp mixture is used, paper and board obtainable by the processes, and various uses of the paper and board.

Disclosed herein is a method for inhibiting and retarding the premature polymerization and the polymer growth of vinyl aromatic monomers wherein the method comprises adding to said monomers an effective amount of an inhibitor and retarder blend comprising: (A) at least one aromatic sulfonic acid; (B) at least one amine; (C) at least one nitrophenol; and (D) at least one member of the group consisting of nitroxy radical-containing compounds and nitrosoanilines.

The present invention is directed to the use of alkyl (meth)acrylate polymers or copolymers of the formula (I)

In-Poly-(E)_y  (I)

as cold flow improvers in biodiesel fuel (or bio-fuel) and biodiesel compositions incorporating said polymers or copolymers, obtained by nitroxyl mediated controlled free radical polymerization,

• wherein
• In is the initiator fragment starting the polymerization reaction;
• E is an end group bearing at least one stable free nitroxyl radical, which is bound via an oxygen atom to the polymer or copolymer; or a group which results from a substitution or elimination reaction of the attached stable free nitroxyl radical;

Poly is any polymer or copolymer formed from ethylenically unsaturated monomer(s); and

• y is a number 1 or greater than 1 indicating the average number of end groups E attached to Poly.

The purpose of the present invention is to develop and provide a less expensive and novel oxidizing agent for 5-hydroxymethylcytosine, which can selectively oxidize 5-hydroxymethylcytosine on DNA into 5-formylcytosine while preventing the DNA structure from destabilization and suppressing side reactions, and a method for detecting a demethylation site at a high accuracy in demethylation of DNA with the use of the aforesaid oxidizing agent.

Provided is an oxidizing agent for 5-hydroxymethylcytosine that comprises a nitroxyl radical molecule and a copper salt or a copper complex, and/or a nitroxyl radical molecule-copper complex.

The present invention relates to an environmentally friendly process for the selective oxidation of carbohydrates. The process comprises the addition of a hydroperoxide, including hydrogen peroxide, to a carbohydrate having primary alcohol groups, particularly including polysaccharides, wherein said carbohydrate is contact with a nitroxyl radical mediator and the process is catalyzed by a peroxidase enzyme in the presence of halide ions.

A stabilized composition consists essentially of unsaturated hydrocarbon-based materials, and a stabilizer selected from the group consisting of a hydroxybenzophenone and a nitroxyl radical based stabilizer.

A stabilized composition consists essentially of unsaturated hydrocarbon-based materials, at least one polar liquid and a stabilizer selected from the group consisting of a hydroxybenzophenone, a nitroxyl radical based stabilizer and a hydroquinone based stabilizer.

A method for stabilizing unsaturated hydrocarbon-based precursor material against the polymerization comprises providing a stabilizer selected from the group consisting of a hydroxybenzophenone and a nitroxyl radical based stabilizer.

A method for stabilizing a mixture of unsaturated hydrocarbon-based precursor material with at lease one polar liquid against the polymerization comprises adding to the mixture, a stabilizer selected from the group consisting of a hydroxybenzophenone and a nitroxyl radical based stabilizer.

A photoelectric conversion element is provided which includes a photoelectrode (101) having a porous semiconductor layer (106) and a transparent electrode (107) and a counter electrode (102) disposed to face the photoelectrode (101) and in which a nitroxyl radical compound expressed by General Formula 1 is mainly enclosed between the photoelectrode (101) and the counter electrode (102).

• • (where A in General Formula 1 represents a substituted or unsubstituted aromatic group and may contain one or more atoms of oxygen, nitrogen, sulfur, silicon, phosphorus, boron, or halogen and the aromatic group may be obtained by condensing a plurality of aromatic groups).

The invention provides a method for preparing a piperidine nitrogen oxygen-derived free radical polymerization inhibitor, which has the advantages that: firstly, the reaction time is short, the reaction condition is mild, and the operation is simpler; secondly, a catalyst has cheaper price and low cost, is convenient to separate, and can be reused; thirdly, the yield is higher; and fourthly, water is taken as a solvent, and the method for direct drying by distillation cannot generate waste solution and wastewater, does not pollute the environment, and realizes zero release in industrial production in a real sense. Therefore, the method is a method for preparing piperidine nitrogen oxygen-derived free radicals, and provides convenience for industrial production.

Disclosed is a method for preparing methoxy polyethylene glycol methacrylate-styrene polymer under high controllable vacuum degree, relating to the technical field of the synthesis of organic macromolecule through chemical esterification. The method takes methoxy polyethylene glycol at certain polymerization degree and methacrylic acid as raw materials, 4-dimethylaminopyridine as catalyzer and at least one of nitroxyl radical piperidone, toluquinone and hydroquinone as retardant. When the reaction begins, the methacrylic acid in which the retardant is dissolved is added into the reaction kettle drop by drop within 1-3 hours, and water produced in the esterification process is brought away through specific controllable vacuum degree, thus pushing the reaction equation forward towards the positive direction; wherein the specific vacuum degree and the reaction temperature are key factors for controlling the esterification rate and the reaction temperature depends on the vacuum degree of the system. The invention prepares methoxy polyethylene glycol methacrylate-styrene polymer through controllable vacuum degree mode and is moderate in reaction conditions and does not use organic solvent, thus avoiding the step of post processing.

The present invention pertains to a process for controlled free radical polymerization or copolymerization of vinyl chloride at a temperature between 40 DEG C and 95 DEG C, at a pressure between 5 and 30 bar in the presence of a stable free nitroxyl radical.

A method for oxidizing 5-hydroxymethyl furaldehyde, includes at least one step of oxidation in the presence of an organic acid, a nitroxyl radical, an oxygen source, and an oxygen transfer agent.

The invention relates to the technical field of preparation of light stabilizers and particularly relates to a preparation method of alkoxylation intermediates on the basis of diester-sebacate nitroxyl radicals. The preparation method comprises the following steps: carrying out electrolytic catalytic oxidation on bis(2,2,6,6-tetramethyl-4-hydroxypiperidine) sebacate nitroxyl radicals under the existence of water, alcohol, alkali and HCOOH to prepare the alkoxylation intermediates. The preparation method involved in the invention has the following beneficial effects that a reaction is low in temperature compared with a conventional reaction, catalysts are not needed and the reaction is rapid; raw materials are wide in source and low in cost; the final yield of a product is high, so that thepreparation method has more economic value.

The present invention relates to a process for preparing 1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one, which comprises a) providing 6,10-dimethylundeca-1,5,9-trien-4-ol, b) oxidizing 6,10-dimethylundeca-1,5,9-trien-4-ol provided in step a) with an oxidizing agent in the presence of at least one organic nitroxyl radical, at least one nitrate compound and an inorganic solid to yield 6,10-dimethylundeca-1,5,9-trien-4-one, c) reacting the 6,10-dimethylundeca-1,5,9-trien-4-one obtained in step b) with an acid to yield 1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one.

The invention discloses a novel anti-tumor medicament structure represented by a structural general formula (I), wherein R1 to R5 are independently selected from H, OH, OCH3, NO2 and halogen. A synthesis method for the medicaments is simple and convenient, the molecules of the medicaments contain nitroxyl radical structural units, and proliferation of liver cancer, gastric cancer, breast cancer and other tumor cells can be effectively suppressed.

Immobilized nitronyl nitroxide active sites on the surface of a porous inorganic oxide support act as efficient and rapid oxidants for NO, reacting with >99% of the NO under flow conditions through a packed bed; and, in a parallel configuration with nitroxyl radical active sites, act to remove >99% of both NO and NO₂ from a gas mixture, with >95% of the active sites participating in NO_x trapping.

Methods and compositions for treating coal are provided. A nitroxyl radical compound is added to the coal in order to inhibit coal autooxidation. Additionally, the nitroxyl radical compound can be conjointly used with conventional dust control agents, in order to suppress fugitive coal dust dissemination. In those cases in which foamed treatment is desired to treat coal dust, the nitroxyl radical compound can be conjointly used in the foamable compositions, along with a variety of foam building surfactants such as the amphoteric, nonionic and anionic surfactants.