6 results about "Nitroxyl" patented technology

A process for the preparation of a compound of the sterically hindered alkoxyamine class is described, the process comprises the step of alkylating a sterically hindered hydroxylamine compound to a corresponding sterically hindered alkoxyamine by reacting said sterically hindered nitroxyl compound with a compound capable of producing a carbon-central alkyl radical, typically a territorial or secondary alkyl radical, the compounds capable of generating carbon-center alkyl radicals are selected from thermal radical initiators that form radical species in the temperature range of 40 DEG C to 200 DEG C, and from photoinitiators that undergo light excitation when irradiated with UV light or visible light in the range of 180 to 700 nm, in particular UV light in the range of 180 to 380 nm, the compounds capable of generating carbon center alkyl radicals are typically selected from the class of organic peroxides, azo compounds, benzoyl derivatives, benzophenone derivatives, thioxanthone derivatives, benzoin derivatives, benzoyl phosphine oxide derivatives, and the like. The invention relates to a peroxide, for example, selected from the group consisting of diacyl peroxides of formula (A), peracid esters of this formula (A), and oxalic acid peracid esters of formula (D) R-CO-O-O-Z-R (A), r-Z ''-X-CO-CO-O-O-Z''-R (D) wherein each R independently represents a primary or secondary alkyl or cycloalkyl group, preferably comprising from 1 to 15 carbon atoms, and X is oxygen-O-or peroxy-O-O-, Z represents CO or an alkylene group bonded to a quaternary carbon atom, the quaternary carbon atom being an alkylene group of formula (C) R '-C-R' (C), wherein each R'is selected from alkyl groups having 1 to 15 carbon atoms, and Z "represents the alkylene group bonded to a quaternary carbon atom having the formula (C). The described process produces the corresponding O-alkylated derivatives of the sterically hindered hydroxylamines, typically compounds of the class referred to as N-O-alkyl HALS, with very high selectivity and conversion and without the need for the use of catalysts, in particular metal catalysts.

The present disclosure pertains to a molecule that is operable to release a nitroxyl (HNO) upon irradiation. The nitroxyl may be operable to convert to nitrous oxide (N2O). The present disclosure also pertains to methods of releasing nitroxyl from a molecule of the present disclosure by irradiating the molecule. The released nitroxyl may then convert to nitrous oxide. The present disclosure also pertains to methods of administering at least one of nitroxyl or nitrous oxide to a subject by (1) administering a molecule of the present disclosure to the subject; and (2) irradiating the molecule, where the irradiation results in the release of nitroxyl from the molecule. The released nitroxyl may then convert to nitrous oxide.

The present invention belongs to the technical field of organic synthesis, and particularly relates to a method for preparing 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-methoxy oxime ether. The method comprises the following steps: (1) chlorination reaction: adding a chlorinating agent into aniline as a raw material in a solvent at 0-10°C, and performing a chlorination reaction to obtain 2,4,6-trichloroaniline; (2) coupling reaction: subjecting 2,4,6-trichloroaniline, isopropenyl acetate and a catalyst to a coupling reaction in a solvent under the initiation of nitroxyl ions, so as to obtain 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone; (3) oximation reaction: subjecting 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone and hydroxylamine hydrochloride to an oximation reaction in a solvent under the action of an alkali, so as to obtain 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-oxime; and (4) methylation reaction: subjecting 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-oxime and chloromethane to a methylation reaction in a solvent under the action of an alkali, so as to obtain 1-(2,4,6-trichloro-phenyl)-propyl-2-ketone-methoxy oxime ether.

Provided is a process for alkylating a sterically hindered nitroxyl compound to the corresponding sterically hindered alkoxyamine, which process comprises reacting said sterically hindered nitroxyl compound with a peroxide selected from diacyl peroxides of the formula (A), peresters of the formula (A) and oxalic acid peresters of the formula (D)R—CO—O—O—Z—R  (A),R—Z″—X—CO—CO—O—O—Z″—R  (D),wherein each R independently stands for a primary or secondary alkyl or cycloalkyl radical, andX is oxygen —O— or a peroxy group —O—O—,Z stands for CO or an alkylene bonded over a quaternary carbon atom, which is an alkylene of the formula (C)R′—C—R′  (C)wherein each R′ is selected from alkyl of 1 to 15 carbon atoms,Z″ stands for said alkylene bonded over a quaternary carbon atom of the formula (C),provided that, in case that Z is CO, the sterically hindered nitroxyl compound is not 4-hydroxy-1-oxyl-2,2,6,6-tetramethyl-piperidine, and other processes and products.

This invention discloses a method for preparing nano-sized ammoniated aramid by nitration followed by reduction in mixed acid, belonging to the fields of chemistry and materials technology. This invention uses waste aramid as raw material, utilizing the nitryl ions in mixed acid to convert aramid into nitrated aramid; then, using a relatively inexpensive tin dichloride catalyst under mild conditions, the nitro groups on the nitrated aramid are reduced to amino groups, successfully preparing ammoniated aramid. The method for preparing nano-sized ammoniated aramid by nitration followed by reduction in mixed acid has the following advantages: (1) simple operation, low cost, and conducive to industrial production; (2) low reaction temperature, mild experimental conditions, and sustainability; (3) fast reaction and short cycle; (4) convenient product collection, facilitating subsequent use.

The invention relates to the technical field of catalysts, in particular to a catalyst, a preparation method and application of the catalyst in selective nitration reaction of aromatic compounds. The catalyst can improve the solubility of an organic compound and effectively improve the mass transfer effect between an organic phase and a water phase during contact, so that the reaction conversion rate is improved. And the catalyst has relatively strong acidity and can replace sulfuric acid to promote nitric acid to dissociate nitroxyl ions, so that the generation of waste acid is reduced.