73 results about "Formylhydrazine" patented technology

The invention discloses a synthetic method of a 5-acylbenzo[a]carbazole compound. According to the synthetic method, the 5-acylbenzo[a]carbazole compound is synthesized through cascade reaction between a 2-aryl-3-formylhydrazine compound and sulfur ylide. The synthetic method has the advantages of simplicity and convenience in operation, mild conditions, wide substrate application range and the like and is suitable for industrial production.

The invention provides a Schiff base fluorescent probe QCS 3-[N-(2-phenol methylene)] formylhydrazine base-1-(quinoline-2-base)-9H-beta-carboline QCS and a method for preparing the same. The method includes preparation steps of carrying out reaction on 3-methyl formate-1-(quinoline-2-base)-9H-beta-carboline and hydrazine hydrate to obtain 3-formylhydrazine-1-(quinoline-2-base)-9H-beta-carboline; carrying out reaction on the 3-formylhydrazine-1-(quinoline-2-base)-9H-beta-carboline and salicylaldehyde to obtain the Schiff base fluorescent probe QCS. The Schiff base fluorescent probe QCS and the method have the advantages that probe QCS solution is bright blue green in ultraviolet lamps (365 nm) in the presence of Al3+, new emission peaks occur at 490 nm locations of fluorescence emission spectra, and the fluorescence intensity is gradually improved along with increase of the concentration of the Al3+; the Schiff base fluorescent probe QCS can be used for quickly and quantitatively detecting micro/trace amounts of Al3+ from different sources in real time.

The invention provides a preparation method of 5-cyanogen-1-(4-fluobenzene)-1,3-dihydrogenated-isobenzofuranone. The preparation method comprises the following steps: reducing fluorobenzoic acid ester through hydrazine hydrate to obtain fluorobenzene formylhydrazine; enabling the fluorobenzene formylhydrazine to react with 5-bromine-2-hydroxybenzaldehyde under acidic conditions to obtain 4-fluorine-[(5-bromine-2- hydroxy phenyl) methene] hydrazide benzoic acid; oxidizing the 4-fluorine-[(5-bromine-2- hydroxy phenyl) methene] hydrazide benzoic acid through an oxidizing agent to obtain 5-bromine-2-(4-fluorine benzoyl)-benzaldehyde; reducing the 5-bromine-2-(4-fluorine benzoyl)-benzaldehyde through a reducing agent to obtain 4-bromine-Alpha 1-(4-fluorine phenyl)-1,2-xylyl alcohol; performing condensation reaction on the 4-bromine-Alpha 1-(4-fluorine phenyl)-1,2-xylyl alcohol by using toluenesulfonic acid as a catalyst to obtain 1-(4-fluobenzene)-5-bromine-1,3-dihydro- isobenzofuranone; enabling the 1-(4-fluobenzene)-5-bromine-1,3-dihydro- isobenzofuranone to react with copper cyanide to obtain the product. The method is low in cost, simple in technology, easy-operated in reaction, high in yield and suitable for industrialized production.

The invention belongs to the technical field of organic synthesis and particularly provides a method for synthesizing (trifluoromethoxy) anisidine formylhydrazine with a little amount of hydrazine hydrate as reactants, inexpensive organic solvents not mutually dissolving with water as reaction system solvents and phase transfer catalysts as catalysts. The synthetic method quickens reaction, improves product quality and yield, avoids highly virulent hydrazine hydrate pollution, and has the advantages of being high in yield, small in environment pollution and low in cost.

The invention discloses a novel anti-yellowing agent and a preparation method thereof, wherein the novel anti-yellowing agent comprises, in parts by mass, 13-45 parts of an adamantane formylhydrazinederivative, 3-12 parts of alkylol amine, 2-8 parts of 1,2-aminoazophenylene, 3-15 parts of o-acetylsalicylic acid, 1-10 parts of lauryl alcohol polyoxyethylene ether, 10-40 parts of urea and 30-60 parts of distilled water; the adamantane formylhydrazine derivative is N-(chloroacetyl)-adamantane formylhydrazine or N-(2-phenylamino-acetyl)-adamantane formylhydrazine. The novel anti-yellowing agent has the advantages of low cost, no containing of harmful by-products (especially ADH), lasting anti-yellowing effect and no formaldehyde adsorption risk, and meets the environmental-protection requirements.

The invention belongs to the field of pharmaceutical chemicals, and particularly relates to a preparation method of topiroxostat. The preparation method disclosed by the invention comprises the following steps: 2-cyanopyridine and formamide are taken as raw materials to react to prepare 2-cyano-4-carbamoyl-pyridine; the 2-cyano-4-carbamoyl-pyridine continues to react with isoniazide to obtain a key intermediate 4-picolinic acid hydrazide-N'-(2-cyanopyridine-4-carbodiimide), and the key intermediate 4-picolinic acid hydrazide-N'-(2-cyanopyridine-4-carbodiimide) is subjected to ring closing to obtain the topiroxostat. The invention provides the novel method for synthesizing topiroxostat, which avoids the use of highly toxic chemical reagents, replaces a traditional catalyst with a green catalyst, is milder in reaction, is economical and environment-friendly, is higher in yield, and is suitable for industrial production.

The invention relates to a biological bactericide and a preparation method thereof. The biological bactericide is N-o-chlorophenylacetyl-N-phenazine-1-formylhydrazine which is obtained by virtue of two-step fermentation culture of a genetically improved strain SN36 of pseudomonas choloeaphtis in a liquid culture medium; the collection number of the obtained SN36 in the China General Microbiological Culture Collection Center is CGMCC No.7846. Compared with the prior art, the biological fermentation product has remarkable effects on prevention and treatment of fungal diseases of a plurality of crops, and mass production of the biological bactericide can be realized by virtue of introduction.

The invention provides a phenoxyl tritriazole compound, a preparation method and applications thereof. The invention discloses a preparation method of 4-(4-(3,5-di(4-(4H-1,2,4-triazole-4-yl)phenoxyl)phenoxyl)phenyl)-4H-1,2,4-triazole. The compound is prepared by a one-pot method, namely heating 4-(3,5-di(4-aminophenoxyl)phenoxyl)aniline and diformyl hydrazine to prepare the compound. The preparation method has the characteristics of simple operation, low production cost, and little environment pollution, and is suitable for massive industrial production. The prepared 4-(4-(3,5-di(4-(4H-1,2,4-triazole-4-yl)phenoxyl)phenoxyl)phenyl)-4H-1,2,4-triazole can be applied to fields of photoelectric materials and luminescent agents.

The invention discloses a benzimidazole [1, 2-a] pyridines hydrazine derivative Hg<2+> fluorescence probe, the probe is benzoyl isothiocyanate-substituted 2-phenylbenzimidazole [1, 2-a] pyridine-3-formylhydrazine, and the chemical structural formula is shown in the formula (1). The fluorescence probe has better fluorescence selectivity, higher sensitivity and stronger ability to resist other ion interference for Hg<2+> in a PBS/EtOH(8/2 v/v) buffered solution (a pH value equals to 7.40), and has a wide application prospect.

The invention discloses a high-sensitivity fluorescent probe for detecting Hg<2+>, a preparation method and application thereof. The N'-(4'-(6, 6-dimethyl-4, 5, 6, 7-tetrahydro-1H-5, 7-bridge methylene indazole-3-yl)-[1, 1'-biphenyl]-4-methylene)pyridine-2-formylhydrazine is prepared by taking a natural renewable resource beta-pinene derivative nopinone as a raw material. The compound can be selectively complexed with Hg<2+>, cyan fluorescence of the compound is rapidly quenched, the detection limit reaches 17nM, and the compound can be used as a specific fluorescent probe for detecting Hg<2+>and has good application value.

The invention discloses a method for synthesizing 1, 2, 4-triazole-3-carboxylic acid methyl ester, and belongs to the field of organic chemistry. The method comprises the following reaction steps: reacting trichloroacetonitrile 1 with formylhydrazine 2 to generate an intermediate 3, then carrying out cyclization reaction to obtain an intermediate 4, and finally carrying out alcoholysis reaction togenerate 1, 2, 4-triazole-3-carboxylic acid methyl ester 5. According to the method, only three steps of reaction are needed, the overall yield is high, dangerous diazotization deamination reaction in a traditional synthesis process is avoided, the safety risk in the reaction process is reduced, and meanwhile the production cost can be reduced.

A method for synthesizing N'-[(2S, 3S)-2-(benzyloxy) pentyl-3-base] formylhydrazine comprises the following steps: reacting (S)-2-benzyloxypropionic acid with an acylation reagent to obtain (S)-2-benzyloxy propionyl chloride; adding a palladium barium sulfate catalyst into o-xylene and reacting in hydrogen atmosphere for 15-30 min; adding (S)-2-benzyloxy propionyl chloride hydrogen atmosphere forreflux reaction until hydrogen is not absorbed; after the reaction is finished, the catalyst is filtered and the o-xylene is removed to obtain (S)-2-benzyloxypropionaldehyde; reacting the (S)-2-benzyloxypropionaldehyde with formylhydrazine, removing the solvent after finishing the reaction, and post-treating to obtain (S)-N'-(2 benzyloxypropyl) formylhydrazine; reacting the (S)-N'-(2 benzyloxypropyl) formylhydrazine with a Grignard reagent, and post-treating to obtain N'-((2s,3s)- 2-(benzyloxy) pentyl-3-base] formylhydrazine. According to the invention, an acylating reagent which is low in price and safer and more environment-friendly in reaction and a palladium barium sulfate catalyst which can be recycled for a plurality of times are used as reaction raw materials, so that the reaction process more conforms to the principle of atom economy, and the reaction is milder.

The invention discloses a preparation method of 4,5-dibromophthalic acid. The preparation method comprises the following steps: (1) after dissolving phthalylhydrazine into glacial acetic acid, adding N-bromo-succinimide (NBS), heating the mixture to 80 to 100 DEG C and reacting for 0.5 to 1 hour; after the reaction is finished, cooling the system to a room temperature and pouring the mixture into ice water; separating out solids and filtering to obtain dibromophthalhydrazide and filtrate; (2) dissolving the dibromophthalhydrazide into a sodium hydroxide water solution, and heating the mixture to 60 to 70 DEG C and carrying out a hydrolysis reaction; after the hydrolysis reaction is finished, adjusting the pH of the hydrolysis reaction system to be 6 to 7; separating out white solids, and filtering and washing with water to prepare the 4,5-dibromophthalic acid. The preparation method of the 4,5-dibromophthalic acid has the advantages that the cost is low; products of two steps are both separated out in a solid manner; reaction is easy to treat and the purity of the products is high; industrial requirements on the products can be met completely, and sufficient raw materials are provided for research and development of downstream chemical products and materials.

The invention particularly relates to preparation of an aldehyde group modified covalent organic frameworks (COFs) material, and the aldehyde group modified covalent organic framework material is applied to gas adsorption. The preparation method comprises the following steps of: firstly, selecting a precursor 1, 3, 5-benzenetricarboxaldehyde (TFB) which not only has good rigidity and is highly symmetrical, but also can react with a bifunctional monomer formylhydrazine (FH) through Schiff base, and taking acetic acid as a catalyst to prepare the novel COF with good performance. The prepared covalent organic framework material not only has relatively good stability and relatively large specific surface area, but also forms a hollow structure with relatively uniform size, and the prepared material can be applied to adsorption of carbon dioxide gas.

The invention relates to a preparation method of pharmaceutical intermediates, in particular to a preparation method of o-aminosulfonyl-benzoyl hydrazine, belonging to the intermediates preparation field of organic synthesis. The preparation method comprises the following steps of: (1), firstly, determining that the feed ratio of o-sulfonylbenzoylimine to hydrazine hydrate is 1mol to 1-10mol; at the room temperature, adding the o-sulfonylbenzoylimine to a container, adding anhydrous alcohol as a solvent, and stirring to fully mix; and under the ice-bath condition of 5 DEG C below zero-5 DEG C, dropwise adding the hydrazine hydrate while stirring; (2), heating the solution to back flow within 30 minutes when the solution changes clear; and continuously reacting for 1-15 hours at the backflow temperature; and (3), transferring the reaction liquid to a beaker for naturally cooling to the room temperature, standing to separate out granulous white crystals, washing with water and alcohol, and drying to obtain the final product, i.e. o-aminosulfonyl-benzoyl hydrazine. In the invention, the preparation method has the advantages of simple operation, easy control, one-step finished reaction, high purity, innocuity and the like.

The invention provides a second-order nonlinear laser crystal N, N'-acetyl-(2-thenoyl) hydrazine crystal and a preparation method and application thereof. The crystal belongs to the orthorhombic crystal system, the space group is C<cc2>, the molecular formula is C7H8N2O2S, Mr equals to 184.21, the crystallography parameter is as follows: a equals to 14.027 angstroms, b equals to 15.572 angstroms, c equals to 8.1078 angstroms, V equals to 17771.0 cubic angstrom, and Z equals to 8, a molecule of the N, N'-acetyl-(2-thenoyl) hydrazine is formed by the N-(2-thenoyl) hydrazino plane and an acetyl plane which are mutually perpendicular; the preparation method of the hydrazine crystal comprises the following steps: acetyl is introduced onto the N-(2-thenoyl) hydrazine, then the produced N, N'-acetyl-(2-thenoyl) hydrazine is dissolved into the chloroform and methyl alcohol mixed solvent, the ration of chloroform and methyl alcohol both of the chloroform and methyl alcohol mixed solvent is 1 to 1, and the mixture is evaporated till approximate saturation under the room temperature, and is evaporated slowly under the temperature of 10 DEG C so as to obtain the tabular crystal N, N'-acetyl-(2-thenoyl) hydrazine crystal. According to the hydrazine crystal, the melting point of the crystal is high and reaches 180.5-181.5 DEG C, and the application range is wider.

The invention relates to a covalent organic framework material containing an oxadiazole connecting element. The preparation method of the material comprises the following steps: (1) adding aromatic aldehyde, aromatic formylhydrazine, a first organic solvent and an inorganic acid aqueous solution into a Schlenk tube, and reacting the mixture at 100-130 DEG C for 3-7 days to obtain COFs containing an N-acylhydrazone linking element; (2) adding the COFs, copper salt and carbonate into a second organic solvent, and reacting the components at 90-120 DEG C for 3-7 days to obtain the COFs containing the oxadiazole connecting element. The post-synthesis modification strategy of COFs provided by the invention not only widens the absorption range of COFs in a visible light region, but also can better promote the separation and transportation of photon-generated carriers, thereby improving the performance of photocatalytic water production for hydrogen production.