83 results about "Nitroxyl radicals" patented technology

An inhibitor mixture containing, as components, a) at least one nitroxyl radical (derivative), b) at least one phenol (derivative) and c) at least one chemical compound which contains at least one phosphorus atom which has the oxidation state +3 is preferably used for stabilizing compounds capable of free radical polymerization.

Polysaccharide aldehydes are prepared using selective oxidation involving the use of nitroxyl radical mediated aqueous oxidation with a limited amount of oxidant and defined reaction conditions. These polysaccharide aldehyde derivatives having maximum effective aldehyde and minimal carboxylic acid levels making them especially useful as wet, temporary wet and dry strength additives for paper.

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.

There can be provided an energy storage device comprising a positive electrode comprising a nitroxyl compound having a nitroxyl cation partial structure in an oxidized state and having a nitroxyl radical partial structure in a reduced state; a negative electrode comprising a carbon material which lithium ions can be reversibly intercalated into and deintercalated from; and an electrolytic solution comprising a lithium salt and an aprotic organic solvent, wherein the negative electrode is a negative electrode comprising the carbon material which lithium ions are previously intercalated into, apart from lithium ions associated with a capacity A of lithium capable of being intercalated and deintercalated in charge and discharge, thereby allowing the energy storage device to simultaneously achieve high energy density, high output characteristics, low environmental load, and high stability in charge and discharge cycles.

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,whereinIn 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); andy 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 process for the preparation of 2-oxocarboxylic acid esters represented by the following general formula (I), comprising by oxidizing a 2-hydroxycarboxylic acid ester represented by the following general formula (II) in the presence of a nitroxyl radical represented by the following general formula (III), a hypochlorite, a metal bromide and water with the pH of the reaction system being kept within the range of 5 to 7: (I) (II) (III) wherein R1 and R2 are each independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or an aralkyl group, which each may be substituted with substituents; and R3 is a hydrogen atom, an alkoxyl group, an aralkyloxy group, an acyloxy group or a hydroxyl group.

A charge storage device such as a battery, wherein a positive electrode comprises a nitroxyl compound having a structure of a nitroxyl cation moiety represented by formula (I) in an oxidized state while having a structure of a nitroxyl radical moiety represented by formula (II) in a reduced state and a reaction represented by reaction formula (A) in which an electron is transferred between these states is used as a positive electrode reaction. The charge storage device can have a higher energy density and can be used at a large current.

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.

Cellulose is oxidized catalytically using a heterocyclic nitroxyl radical as catalyst, main oxidant acting as oxygen source, and an activator of the heterocyclic nitroxyl radical. The oxidation is performed in a reaction medium which is at medium consistency of cellulosic pulp, which is above 6%, more preferably equal to or higher than 8%, and most preferably in the range of 8-12%. The reaction medium is mixed in a reactor through circulation of the reaction medium back to the reactor.

In a method for catalytic oxidation of cellulose a heterocyclic nitroxyl radical is used as catalyst, hypochlorite is used as main oxidant acting as oxygen source, and a tertiary amine or chlorine dioxide as an activator of the heterocyclic nitroxyl radical.

The present invention provides a photoelectric conversion element including a photoelectrode (101) constituted of a porous semiconductor layer (106) and a transparent electrode (107) and a counter electrode (102) disposed opposite the photoelectrode (101), wherein a nitroxyl radical compound represented by general formula (1) is mainly contained between the photoelectrode (101) and the counter electrode (102). In general formula (1), A represents a substituted or unsubstituted aromatic group and optionally includes one or more oxygen, nitrogen, sulfur, silicon, phosphorus, boron, or halogen atoms, and the aromatic group may be one formed by fusion of a plurality of aromatic groups.

This invention pertains to a novel process for preparing sterically hindered N-substituted alkyloxyamines from alkenes by the transition-metal-catalyzed reaction of a intermediate alkylborane with a sterically hindered nitroxyl radical.

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.

A secondary battery that includes a sheet-like member containing at least an electrode active material and an electrolyte; and first and second conductive layers containing at least a conductive aid and which are positioned on the opposed principal surfaces of the sheet-like member. The electrode active material contains an organic compound (for example, an organic compound having a stable radical) which participates in both oxidation and reduction reactions such that the positive electrode active material and negative electrode active material are formed from the same organic compound. In addition, the sheet-like member includes at least a polymer compound, and the organic compound contains at least one of a nitroxyl radical, a verdazyl radical, and a nitronyl nitroxyl radical.

Sterically hindered N-substituted aryloxyamines are prepared by the Keggin polyoxometalate or the transition metal substituted polyoxometalate (TMS-POM) catalyzed decomposition of diazonium salts in the presence of a sterically hindered nitoxyl radical. These compounds are useful as thermal and light stabilizers for a variety of organic substrates.

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 NOx trapping.

Methods of selectively modifying lignin, polycarboxylated products thereof, and methods of deriving aromatic compounds therefrom. The methods comprise electrochemically oxidizing lignin using stable nitroxyl radicals to selectively oxidize primary hydroxyls on β-O-4 phenylpropanoid units to corresponding carboxylic acids while leaving the secondary hydroxyls unchanged. The oxidation results in polycarboxylated lignin in the form of a polymeric β-hydroxy acid. The polymeric β-hydroxy acid has a high loading of carboxylic acid and can be isolated in acid form, deprotonated, and / or converted to a salt. The β-hydroxy acid, anion, or salt can also be subjected to acidolysis to generate various aromatic monomers or oligomers. The initial oxidation of lignin to the polycarboxylated form renders the lignin more susceptible to acidolysis and thereby enhances the yield of aromatic monomers and oligomers obtained through acidolysis.