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91 results about "Pyrylium salt" patented technology
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Pyrylium is a cation (positive ion) consisting of a six-membered ring of five carbon atoms, each with one hydrogen atom, and one positively charged oxygen atom. The bonds in the ring are conjugated as in benzene, giving it an aromatic character. In particular, because of the positibe charge, the oxygen atom is trivalent. Pyrilium is a mono-cyclic and heterocyclic compound, one of the oxonium ions.
Methyl pyridinium with organic two-photon absorption materia, and preparation method and application thereof
InactiveCN102702090APromote absorptionGood water solubilityOrganic chemistryMaterial analysis by observing effect on chemical indicatorSolubilitySolvatochromism
The invention relates to the field of organic nonlinear optical materials and relates to methyl pyridinium with an organic two-photon absorption material, and a preparation method and the application of the methyl pyridinium. The structural formula of the product is described in structural formula (I); the preparation method comprises the steps of taking 2,6-dimethyl pyridine as a raw material and finally obtaining a compound (I) by conducting oxidizing reaction, esterification reaction, methylolation reaction, halogenation reaction, nucleophilic addition reaction, Wittig reaction and the final methylation reaction. The raw materials are easy to access, and the synthesis steps are simple. The compound (I) has excellent two-photon absorption performance and good water solubility and is an ideal biological fluorescence probe; an obvious solvatochromism phenomenon easily occurs, the compound can be used for detecting water content in a common organic solvent, can also be used as a fluorescent probe for detecting the PH value in a solution system, has a series of advantages of high sensibility, quick response, identification by naked eyes and the like, and has an excellent application prospect.
Owner:SHANGHAI NORMAL UNIVERSITY
Purpurine derivative electrochromic material and preparation method thereof
ActiveCN110105336AGood designabilityImproved electrochromic performanceOrganic chemistryTenebresent compositionsHigh contrastPyrrole
The invention discloses a purpurine derivative electrochromic material and a preparation method thereof. The preparation method comprises the steps that 4,4'-dipyridine is adopted as a raw material and undergoes a Menschutkin reaction with 1-chloro-2,4-dinitrobenzene to synthesize a 1,1'-bis(2,4-dinitro)-4,4'-dipyridyl salt; then an N-heterocyclic compound and p-fluoronitrobenzene are subjected toaromatic nucleophilic amination to prepare a 4-nitrocompound, and then the 4-nitrocompound is reduced into a 4-amino compound; finally, the products obtained after the reactions in the two steps undergo a Zincke reaction to obtain a target product. A pyrrole group and carbazole are introduced into a derivative, the electron deficient state of the core group 4,4'-dipyridine of a purpurine compoundis improved, and the electrochromic voltage of the purpurine compound is reduced; moreover,a bipolar electrochromic device can be obtained, a higher contrast ratio is realized, multiple color changesare obtained, and the problem of electrolyte leakage of solution-type electrochromic devices can also be solved.
Owner:SOUTH CHINA UNIV OF TECH
Method for preparing double-hydrophilic block copolymer
InactiveCN101544734AClear structureUniform molecular weight distributionFungicidesPyridiniumPolymer science
The invention relates to a method for preparing a double-hydrophilic block copolymer, belonging to the technical field of functional polymer preparation. Poly (tert-butylmethacrylate)-b- poly-4-vinylpyridine (PtBMA-b-P4VP) block copolymer is prepared by a tomic transfer radical polymerization method; and PMAA-b-QP4VP which is the double-hydrophilic block copolymer is obtained through the quaternary ammonium modification on a P4VP chain section and the hydrolysis reaction of tertiary butyl in a PtBMA chain section. Due to the antibacterial action of pyridinium and the mating reaction of pyridine group and metallic ion, the PMAA-b-QP4VP which is the double-hydrophilic block copolymer can be widely applied to the field of medicine, heavy metal loading, rubber, dye, water body sterilization, corrosion inhibition and microbial adsorption.
Owner:JIANGNAN UNIV
One and two-photon mitochondrion fluorescence probe and application thereof
ActiveCN103333678ALow priceGood two-photon performanceOrganic chemistryFluorescence/phosphorescenceHydrogenConfocal
The invention discloses a one and two-photon mitochondrion fluorescence probe. The fluorescence probe is a pyridine salt compound, the structure of which is shown by a general formula (I), wherein R1 in the general formula represents alkyl or hydroxyalkyl, and R2 represents acetyl or hydrogen. The invention also discloses the application of the fluorescence probe of marking or displaying the distribution of the mitochondrion in living cells. Experiments prove that compared with mitochondrion fluorescence probes sold in markets, the mitochondrion fluorescence probe has the characteristics of low price, good two-photon property, low excitation energy, strong developing performance, better biocompatibility, and capability of focusing on fluorescence imaging mitochondrion in the living cells, and has potential application value in the field of exciting fluorescence biomarker with laser.
Owner:SHANDONG UNIV
Method for synthesizing 4,6-disubstituted amido-1,3,5-triazine derivative
InactiveCN101041642AThe synthesis method is simpleMild conditionsOrganic chemistryCyanuric acidTriazine derivative
The invention discloses a clean manufacturing method of 4, 6-disubstituted-amino-1, 3, 5-triazine derivant, which comprises the following steps: adopting cyanuric acid and substituted amine as raw material; adopting imidazole salt, pyridine salt or quaternaries as ionic solution; simplifying the operation; reducing environmental pollution; improving receiving rate; fitting for large scale of industrial manufacturing.
Owner:ZHEJIANG UNIV OF TECH
Triphenylamine pyridinium salt fluorescent molecule and preparation method thereof
InactiveCN103896830AGood fluorescence enhancementHas red light emitting propertiesOrganic chemistryBiological testingPyridiniumBenzaldehyde
The invention discloses a triphenylamine pyridinium salt fluorescent molecule and a preparation method thereof. The red light emitting triphenylamine pyridinium salt fluorescent molecule is obtained by carrying out a reaction on 4-[N, N-bi(4-pyridine vinyl) phenyl amino] benzaldehyde and iodooctadecane in an acetone solution. The pyridinium salt compound disclosed by the invention emits red light when the compound is solid, wherein the wavelength is 656nm. The pyridinium salt compound disclosed by the invention is water-soluble and emits red light in water, wherein the wavelength is 647nm. In a water / ethanol mixed solvent, the emitting wavelength is in a band of 610-640nm. The pyridinium salt compound disclosed by the invention has a red light emitting property and has an important application value in the fields such as fluorescence sensors, fluorescence probes, biomarkers, fluorescence imaging and organic light-emitting apparatuses.
Owner:SOUTHEAST UNIV
Halamine-pyridine salt double-function group polysiloxane bactericide, and preparation method and application thereof
ActiveCN104957168AWide temperature rangeImproves fiber strength and wash performanceBiocideFibre treatmentCarboxylic groupSilicone oil
The invention relates to a polysiloxane bactericide simultaneously carrying double halamine and pyridine salt function groups. The bactericide has a structure as shown in a general formula (I). The invention further relates to a preparation method for the bactericide. The preparation method comprises the following steps: with hydrogen-containing silicone oil as a reactant, bonding the hydrogen-containing silicone oil with an ester bond and hydrolyzing the ester bond into a carboxyl group; reacting the carboxyl group with a pyridine derivative containing an amino group so as to produce an amide bond; subjecting a pyridine ring to quaternary ammonium salinization with a halogenated compound so as to produce a pyridine salt; and halogenating the amide bond so as to produce a halamine bond. The polysiloxane bactericide provided by the invention has the advantages of high bactericidal efficiency, low toxicity, high selectivity, lasting bactericidal performance and capacity of firmly bonding with a substrate via a plurality of manners.
Owner:SHANDONG UNIV OF SCI & TECH
Phosphine-functionalized polyether pyridinium salt ionic liquid and application thereof in the hydroformylation of olefins
ActiveCN105017316AHigh catalytic activityGroup 5/15 element organic compoundsOrganic-compounds/hydrides/coordination-complexes catalystsPolymer sciencePyridinium
The present invention relates to a phosphine-functionalized polyether pyridinium salt ionic liquid and a method for biphasic hydroformaylation of olefins based on the phosphine-functionalized polyether pyridinium salt ionic liquid. A biphasic catalytic system is used in the method, wherein the catalytic system consists of a phosphine-functionalized polyether pyridinium salt ionic liquid, a rhodium catalyst, a reaction substrate, olefins, and a reaction product, aldehydes; liquid / liquid biphasic hydroformylation of olefins is performed at a certain reaction temperature and syngas pressure; the phosphine-functionalized polyether pyridinium salt ionic liquid acts both as a phosphine ligand and as a rhodium catalyst carrier; there is no need to add any other ionic liquid to the system; and separation and recycling of the rhodium catalyst are realized by liquid / liquid biphasic separation after the reaction. The catalytic system provided by the present invention is high in catalytic activity. The rhodium catalyst is capable of being recycled for many times with no obvious decrease in catalytic activity or selectivity.
Owner:QINGDAO UNIV OF SCI & TECH
Polyrotaxane-shaped two-dimensional supermolecule nano-assembly system driven by photoreaction and preparation method and application of system
The invention discloses a polyrotaxane-shaped two-dimensional supermolecule nano-assembly system driven by a photoreaction and a preparation method and application of the system, and belongs to the field of periodic supermolecule nano-assembly systems. The construction unit of the assembly system takes curcubit[8]uril as a host and takes a triphenylamine derivative as a guest. Firstly, triphenylamine modified by alkenyl pyridinium and the curcubit[8]uril form a two-dimensional periodic polyrotaxane-shaped supermolecule assembly system through self-assembly under the host-guest mutual effect; under the visible light irradiation condition, the alkenyl structure in guest molecules can be subjected to a photodimerization reaction, so that the original polyrotaxane-shaped supermolecule assemblysystem is converted into the more stable two-dimensional periodic polyrotaxane-shaped supermolecule assembly system; due to the fact that the obtained polyrotaxane-shaped supermolecule assembly system has good stability and water solubility, the polyrotaxane-shaped supermolecule assembly system can serve as a trapping agent of fullerene (C60), the functional supermolecule composite system is further constructed, a good effect is achieved in the aspect of photodynamics therapy, and the polyrotaxane-shaped two-dimensional supermolecule nano-assembly system has a wide application prospect in theaspect of biological medicine.
Owner:NANKAI UNIV
Synthetic method of oleic acid-2-hydroxy-3-(triethyl ammonium chloride)propyl ester surfactant
InactiveCN104693050AHigh interface activity and oil compatibilityReduce interfacial tensionOrganic compound preparationBuilding insulationsSolventBenzyl chloride
The invention relates to a preparation method of a novel cation asphalt emulsifier, which takes nicotinic acid and glycol as initial raw materials, an esterification reaction is carried out to obtain symmetrical gemini nicotinate, benzyl chloride on chloromethylated polystyrene (PVBC) resin is taken as an active center, and is grafted and quaternized to obtain water-insoluble gemini nicotinate pyridinium bactericide, and the novel water-insoluble gemini nicotinate pyridinium asphalt emulsifier is prepared, and thereby an optimum synthesis technology is given. The synthesized emulsifier is the slow-cracking asphalt emulsifier. The method can be widely used for a bonding layer, a fog sealing layer and solvent-free cold stirring and used for recovery / utilization of asphalt and bituminous pavement base stabilization.
Owner:QINGDAO HUICHENG PETROCHEM TECH
Circularly polarized light-emitting organic micro-nano crystal material as well as preparation method and application thereof
ActiveCN113004194AScale controllableRegular shapeOrganic chemistry methodsSulfonic acids salts preparationPyridiniumStructural formula
The invention provides a circularly polarized light-emitting organic micro-nano crystal material as well as a preparation method and application thereof, belongs to the technical field of organic light-emitting materials, and aims to solve the problems that materials with circularly polarized light-emitting performance in the prior art are generally very complex in molecular structure and relatively long and tedious in preparation process. The circularly polarized light-emitting organic micro-nano crystal is an ionic pyridinium salt compound, and the structural formula is shown as a formula I in the specification; the ionic pyridinium salt compound is composed of positive ions of 2, 2'-bis(2-pyridine)-1, 1'-biphenyl or derivatives thereof and negative ions of camphorsulfonate radicals; and in the formula I, * represents chirality of the camphorsulfonate radicals, the camphorsulfonate radicals are left-handed (L) or right-handed (D), and R groups are H or aromatic substituent groups with different conjugate lengths. According to the method, the high-quality circularly polarized light-emitting two-dimensional micro-nano crystal is prepared in situ through a simple and rapid one-step solution reprecipitation method. The organic micro-nano crystal material can be applied to the fields of optical sensing and the like.
Owner:INST OF CHEM CHINESE ACAD OF SCI
Organic light-emitting device having pyrylium salt as charge transport material
InactiveUS6841270B2Enhanced charge transport propertiesDischarge tube luminescnet screensElectroluminescent light sourcesTransport layerOrganic light emitting device
An organic light-emitting device (OLED) in which pyrylium salt or its derivative, such as thiapyrylium, selenapyrylium, or telluropyrylium, is used as a charge transport material and / or at least a dopant or principal component in a charge transport layers.
Owner:CANON KK
Method of preparing 4,5-disubstituted 1,2,3-triazole with pyridinium salt
InactiveCN108358859ASynthetic operation is simpleSuitable for industrial scale-up productionOrganic chemistryHalohydrocarbonPyridinium
The invention relates to a method of synthesizing a 4,5-disubstituted 1,2,3-triazole compound. The method comprises the following step of by taking pyridine, halohydrocarbon, sulfonic ester, aldehydeand sodium azide as raw materials, and performing room-temperature reaction with a one-pot method. The synthetic method does not need a metal-containing catalyst, has the advantages of high yield of synthetic products, mild reaction condition, good functional group compatibility and the like, is simple in operation step, mild in reaction condition and wide in application range of a substrate, hasinnovativeness and a potential practical value and is suitable for industrial production.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Quinoxaline-based D-A-pi-A type organic photosensitizer as well as synthesis method and application thereof
ActiveCN112094263ABroad absorption spectrumStrong ROS generation efficiencyOrganic chemistryPhotodynamic therapyQuinoxalinePhotodynamic therapy
The invention discloses a quinoxaline-based D-A-pi-A type organic photosensitizer as well as a synthesis method and application thereof, and belongs to the field of tumor photodynamic therapy. According to the invention, a series of novel D-A-pi-A structure near-infrared organic photosensitizers are synthesized by taking triphenylamine as an electron donor, diphenyl substituted quinoxaline as an additional receptor and pyridinium as a terminal electron acceptor. The introduction of diphenyl-substituted quinoxaline can effectively red-shift the light absorption and emission spectrum of the photosensitizer, and on the other hand, the existence of benzene rings on triphenylamine and quinoxaline with propeller structures can effectively inhibit the pi-pi accumulation effect between molecules,thereby improving the photodynamic therapy effect of the photosensitizer. By integrating the effects of the two aspects, the organic photosensitizer has a good application prospect in tumor photodynamic therapy.
Owner:WENZHOU MEDICAL UNIV
Pyridinium cationic lipids as gene transfer agents
Pyridinium cationic lipids useful as non-viral gene delivery agents are disclosed. The agents are prepared by reaction of pyrylium salts with primary amines. Also disclosed are methods of trasfectind cells using the pyridinium cationic lipids as gene transfer agents.
Owner:TEXAS A&M UNIVERSITY
Moxifloxacin drug derivatives as well as preparation method and application thereof
ActiveCN112409352AGood AIE propertiesHigh activityAntibacterial agentsOrganic chemistryPyridiniumStaining
The invention belongs to the field of biomedical materials, and discloses moxifloxacin drug derivatives as well as a preparation method and application thereof. The moxifloxacin drug derivative has astructure shown as a formula I, wherein R is independently an organic cation of triphenylphosphine salt, pyridinium salt and quaternary ammonium salt; x is a monovalent anion; and n is any integer from 1 to 17. The invention also discloses a preparation method of the moxifloxacin drug derivative. The moxifloxacin drug derivative disclosed by the invention has an aggregation-induced emission property, can realize rapid staining recognition on microorganisms, and shows the characteristics of specificity, high efficiency and sensitivity. The moxifloxacin drug derivative disclosed by the inventionhas an excellent antibacterial effect. The moxifloxacin drug derivative disclosed by the invention is used for preparing reagents for specific dyeing of mitochondria and dyeing of microorganisms withnegative charges on the surfaces, and is also used for preparing reagents and antibacterial agents for distinguishing dead and living states of microorganisms.
Owner:SOUTH CHINA UNIV OF TECH
Preparation method of pyrazolo[1,5-a]pyridine derivative
The invention discloses a preparation method of pyrazolo[1,5-a]pyridine derivatives, and belongs to the field of organic synthesis. The problems that an existing pyrazolo[1,5-a]pyridine structure synthesis method needs metal catalysis, the substrate range is limited, the total yield of multi-step reaction is low, stoichiometric additives, toxic oxidants and oxygen-free technologies are adopted, and reaction conditions are harsh are solved. The method comprises the steps: dissolving pyridinium salt, unsaturated alkene and 2,3-dichloro-5,6-dicyanobenzoquinone in an organic solvent, dropwise adding triethylamine to react, concentrating by a rotary evaporator to remove the solvent, and separating and purifying by silica gel column chromatography to obtain the pyrazolo[1,5-a]pyridine derivative.
![Preparation method of pyrazolo[1,5-a]pyridine derivative](https://images-eureka.patsnap.com/patent_img/90846661-91ea-4b88-8b82-e06921f582b8/1.png "Preparation method of pyrazolo[1,5-a]pyridine derivative")
![Preparation method of pyrazolo[1,5-a]pyridine derivative](https://images-eureka.patsnap.com/patent_img/90846661-91ea-4b88-8b82-e06921f582b8/HDA0002858254700000012.png "Preparation method of pyrazolo[1,5-a]pyridine derivative")
![Preparation method of pyrazolo[1,5-a]pyridine derivative](https://images-eureka.patsnap.com/patent_img/90846661-91ea-4b88-8b82-e06921f582b8/BDA0002858254690000011.png "Preparation method of pyrazolo[1,5-a]pyridine derivative")
Owner:GUIZHOU MINZU UNIV
Azo-quaternary pyridinium salts with acid-enhanced antibacterial efficacy, methods of use, methods of syntheses, and uses thereof
A new azo-type quaternary pyridinium salt (Azo-QPS) shows enhanced activity at acidic conditions (e.g., pH = 5); in neutral or basic conditions, this new Azo-QPS shows a much lower level (2-50 times lower) anti-bacterial activity. The use of such a stimulus-enhance antibiotic can response to the proliferation of bacteria directly. It helps reduce or prevent the build-up of potent antibacterial agents in the oral environment. The antibacterial properties of Azo-QPS are activated when the environmental pH becomes acidic; this acidic pH may be indicative of the accumulation of Streptococcus mutans, or the initiation of tooth decay.
Owner:ADA FOUND
Environmentally friendly hydrolysis process of Grignard reaction metal organic product
ActiveCN111072451ASolve processing problemsAchieve recyclingMagnesium sulfatesPreparation by hydrolysisHydrolysateGrignard reaction
The invention discloses an environmentally friendly hydrolysis process of a Grignard reaction metal organic product. The process specifically comprises the following steps: 1) adding a metered pyridine salt into a reactor, slowly adding an ether solution of a metal organic matter, and continuously reacting for a period of time until the reaction is complete after dropwise adding to obtain an alcohol hydrolysate and metal inorganic salt mixture; 2) filtering or centrifugally separating the obtained mixture to obtain an ether solution of an alcohol hydrolysate and a corresponding metal inorganicsalt solid, and washing the solid salt with an ether solvent; and 3) further treating the obtained solid salt and recycling, and distilling and rectifying the obtained ether solution of the alcohol hydrolysate to recover the ether solvent and pyridine organic matters in the ether solution. According to the process, pyridine acidic salt is used for replacing an acidic aqueous solution, so that thetreatment can be achieved without further introducing water into a reaction system, and the problems of wastewater discharge and solvent treatment are effectively solved.
Owner:SHANGYU NHU BIOCHEM IND
Crosslinked polyethylene foam material and preparation method thereof
The invention discloses a crosslinked polyethylene foam material and a preparation method thereof. The crosslinked polyethylene foam material is prepared by crosslinking polyethylene and alkenyl pyridinium salt. Compared with the prior art, the cross-linked polyethylene foam material disclosed by the invention is better in antibacterial property, and the antibacterial property reaches 95% or above. The cross-linked polyethylene foam material disclosed by the invention is larger in surface tension, longer in surface tension maintaining time, better in product adhesion and wettability, and more beneficial to the gluing performance of the product.
Owner:ZHEJIANG WANLI NEW MATERIALS TECH CO LTD
Six kinds of compound of polysubstituted pyridinium and preparation method
A series of 6 multisubstituted pyridine salts are disclosed, which are iodized N-methyl-2,4,6-tri[(CE)-2-(4-ferrocenylphenyl)vinyl] pyridine salt, iodized N-methyl-2,6-bis[(E)-2-(4-ferrocenylhenyl) vinyl] pyridine salt, iodized N-methyl-2,4,6-tri[(1E,3E)-4-ferrocenyl- 1,3-butadienyl] pyridine salt, iodized N-methyl-2,6-bis[(1E,3E) -4-ferrocenyl-1,3-butadienyl] pyridine salt, iodized N-methyl-2,4,6-tri[(1E,3E)-4-chloro-4-ferrocenyl-1,3-butadienyl] pyridine salt, and iodized N-methyl-2,6-bis[(1E,3E)-4-chloro-4-ferrocenyl-1,3-butadienyl] pyridine salt. Their preparing process are also disclosed.
Owner:EAST CHINA NORMAL UNIV
Pyridinium salt and pest control agent
ActiveUS20200275655A1Effective controlEffectively control ectoparasitesBiocideOrganic active ingredientsPyridiniumHalogen
A compound represented by formula (I) or formula (II):wherein, A represents an oxygen atom or a sulfur atom; X1 represents a halogeno group, a substituted or unsubstituted C1-6 alkyl group and so on; m represents the number of X1 and is any integer of 0 to 5; any two of X1 may be bound together to form a bivalent hydrocarbon group; Y represents a single bond or a substituted or unsubstituted C2-6 alkenylene group; Q1 represents a substituted or unsubstituted C6-10 arylene group or a substituted or unsubstituted 6- to 10-membered heteroarylene group; Q2 represents a substituted or unsubstituted C6-10 aryl group or a substituted or unsubstituted 5- to 6-membered heteroaryl group; Zq− represents a counter ion; and q represents a valence of the counter ion and is 1 or 2.
Owner:NIPPON SODA CO LTD
Preparation method of carboxymethyl inulin
The invention belongs to the technical field of chemical engineering. The invention provides a preparation method of carboxymethyl inulin. According to the invention, inulin, pyridinium salt and a solvent are mixed, gelatinization of the inulin is avoided in the alkalization reaction, and the whole reaction process can be carried out at room temperature; due to the solubilizing effect of the pyridinium salt on reactants, molecules of the reactants are in effective contact, alkalization and etherification reactions are promoted, the reaction time is shortened, and the substitution degree of the carboxymethyl inulin is increased; and meanwhile, sodium hydroxide is added in batches, so that degradation of inulin under a strong alkali condition and reaction of organic chloride and alkali are avoided. Therefore, the preparation method provided by the invention is mild in reaction condition and high in reaction speed, and the prepared carboxymethyl inulin is excellent in appearance.
Owner:赵三虎
Synthesis method of multi-substituted chiral furanose and intermediate compound
ActiveCN101723833AHigh yieldHigh selectivitySugar derivativesOrganic compound preparationSynthesis methodsDouble bond
The invention provides a synthesis method of multi-substituted chiral furanose 3 and intermediate compound. The method comprises the following steps: using compound 12 beta-hydroxyl methyl myristate as raw material to prepare compound 13 by reducing and removing hydroxyl; performing diazotization addition reaction, [3,3] Claisen rearrangement reaction and [1,2] allyl transfer reaction on the compound 13 to obtain compound 14; cutting off double bonds of the compound 14 by using ozone, performing condensation with methanol under the catalyst of pyridinium p-toluenesulfonate to obtain the multi-substituted chiral furanose 3. The process has 9 steps in all and the total yield is 14%. The multi-substituted chiral furanose 3 is a key intermediate used for synthesizing K252a and CEP-701 which have anti-cancer bioactivity, the reaction adopts the compound 12 which is cheap and accessible and can be prepared through industrial production as the raw material, the raw material cost and the manufacturing cost are lower, the chemical yield of the key reaction and the diastereoselectivity are high, the protective group is easy to control, and the operation is simple.
Owner:ZEIN BIOTECHNOLOGY CO LTD +1
Rate hydrogen sulfide chemical dosimeter and preparation method and application thereof
InactiveCN105669533AQuick checkAccurate detectionOrganic chemistryChemical analysis using titrationPyridinium4-Nitrobenzaldehyde
The invention discloses a rate hydrogen sulfide chemical dosimeter and a preparation method and application thereof. The rate hydrogen sulfide chemical dosimeter is iodized 1-methyl-2-(4-nitro)styryl pyridinium with the structural formula shown in the description. The preparation method of the rate hydrogen sulfide chemical dosimeter comprises the steps that iodized 1,2-dimethyl pyridinium and 4-nitrobenzaldehyde are added into a normal butanol solution according to the certain proportion, then, piperazine is added, a reaction is performed on the reflux condition to obtain the rate hydrogen sulfide chemical dosimeter. The rate hydrogen sulfide chemical dosimeter has the good rate chemical dosimeter characteristics, hydrogen sulfide can be rapidly and accurately detected on the physiological conditions, the selectivity of hydrogen sulfide is high, and the antijamming capability of other biological active small molecules is high. The rate hydrogen sulfide chemical dosimeter is simple in synthesis method, high in yield and suitable for industrial production.
Owner:TAISHAN MEDICAL UNIV
Indolizine derivative and preparation method thereof
The invention discloses an indolizine derivative and a preparation method thereof. The indolizine derivative is prepared from pyridinium bromide and allenic acid ester through [3+2] cycloaddition reaction in a reaction solvent under the action of an inorganic base catalyst and a Lewis base promoter in a nitrogen atmosphere. The reaction substrate of the preparation method is simple, easy to synthesize and low in price; wherein the [3+2] cycloaddition reaction has the advantages of mild reaction conditions, high reaction efficiency, high indolizine derivative yield and high atom economy. Therefore, the indolizine derivative has the advantages of no catalyst residue, high purity and high application value.
Owner:苏州新森智能科技有限公司
Polarity-sensitive triphenyl pyridinium fluorescent probe as well as preparation and application thereof
InactiveCN111960994AHas atypical AIE propertiesStrong pull electron capabilityOrganic chemistryFluorescence/phosphorescenceFluoProbesQuantum yield
The invention discloses a polarity-sensitive triphenyl pyridinium salt fluorescent probe and preparation and application thereof. The structural general formula of the fluorescent probe is shown in the specification, and R1 is H, a halogen atom or a methoxy group; and R2 is alkyl or substituted alkyl. The pyridinium salt part in the fluorescent probe with the structure is used as an electron acceptor (Acceptor, A) and has very strong electron withdrawing capability, and meanwhile, the three benzene ring parts in the fluorescent probe are used as an electron donor (Donor, D) and can provide proper electron donating capability; the fluorescent probe with a D-A structure formed in this way has certain fluorescence capability and atypical AIE properties; the solid fluorescence quantum yield is20% or above; in a certain polarity range, along with the enhancement of the solvent polarity, the luminescence red shift in the solvent is realized, the fluorescence intensity is weakened, and the quantum yield is reduced.
Owner:SHENZHEN UNIV
Decorative chromium plating process for imitating stainless steel color
The invention relates to the technical field of chromium plating processing, and particularly discloses a stainless steel color-imitating decorative chromium plating process which comprises the following steps: S1, shielding parts except a to-be-chromium-plated area of an electroplated part, and carrying out wax removal, oil removal and water washing on the to-be-chromium-plated area of the electroplated part; s2, the electroplated part is put into a trivalent chromium electroplating solution to be electroplated; and S3, washing and drying the electroplated part, and then carrying out heat treatment to obtain a product, the trivalent chromium electroplating solution takes water as a solvent, and the trivalent chromium electroplating solution comprises the following solutes in terms of solute: chromium trichloride hexahydrate, an amphoteric pyridinium salt ligand, ethylenediaminetetraacetic acid, malic acid, conducting salt, a buffering agent, a wetting agent, N, N-dimethylformamide, diphenylcarbazide and ferric trichloride. A product obtained through the decorative chromium plating process is free of rime fog, yellowing and dark fringes in appearance, high in chromium electrodeposition rate, high in chromium layer thickness and high in chromium layer hardness, and the market requirement is met.
Owner:厦门市金宝源实业有限公司
Purification method of 5-bromo-2-(2-methyl-2H-tetrazol-5-yl) pyridine
PendingCN111285848AMild purification conditionsPurification conditions are safeOrganic chemistryAcetic acidTetrazole
The invention discloses a purification method of 5-bromine-2-(2-methyl-2H-tetrazol-5-yl) pyridine. The purification method comprises the following steps: (1) dissolving 5-bromo-2-(2-methyl-2H-tetrazol-5-yl) pyridine in a solvent, dropwise adding an acidic ethanol solution, stirring and heating, keeping, then cooling to separate out crystals, filtering, washing the crystals with ethanol, and dryingto obtain 5-bromo-2-(2-methyl-2H-tetrazol-5-yl) pyridine acid salt; and 2) adding the 5-bromine-2-(2-methyl-2H-tetrazol-5-yl) pyridine salt into water for dissolving, adding a solvent, dropwise adding liquid caustic soda, stirring, heating, keeping, cooling to separate out crystals, filtering, washing the crystals with ethanol, and drying to obtain the 5-bromine-2-(2-methyl-2H-tetrazol-5-yl) pyridine. The purification method disclosed by the invention has the characteristics of mild purification conditions, safety, simplicity and convenience in operation, high purity, high yield and the like,reduces the production cost, and overcomes the problems of low product purity and need of repeated recrystallization due to the use of a large amount of isopropyl acetate in the existing process.
Owner:SUZHOU JINGYE MEDICINE & CHEM
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