379 results about "Acetal" patented technology

The invention relates to the technical field of ink, and discloses a preparation method of bio-based degradable water-based ink, which comprises the following steps: carrying out esterification polymerization on vanillin-based spiro acetal diglycidyl ether and diacid to obtain bio-based polyester resin, mixing and dispersing the bio-based polyester resin, petroleum-based resin, pigment, auxiliary agent and the like to obtain the bio-based degradable water-based ink. The bio-based degradable water-based ink is prepared. The bio-based resin contains a plurality of hydrophilic hydroxyl groups, has good solubility and dispersibility in the water-based ink, and generates denser hydrogen bonds and other cross-linking effects with the acrylic resin, so that the hardness of the ink is improved. Meanwhile, the polar hydroxyl groups also greatly enhance the hydrogen bond bonding and anchoring effect between the paint film and the base material, so that the adhesive force is improved. In addition, easily-hydrolyzed spiral acetal bonds, polyester structural units and other degradable chemical bonds in molecular chains of the bio-based resin provide more attack sites for water and microorganisms, the degradation rate is increased, and the degradable function is achieved.

The invention discloses a water-soluble bornyl ester compound and application thereof, the structure of the water-soluble bornyl ester compound is as shown in general formula I, R is acetic acid 2-oxoethyl ester of organic heterocyclic ring, amino acid 2-oxoethyl ester, glycolate of amino acid, acetal of monodisperse polyethylene glycol chain, carbonate, ester or glycosyl; the compound is good in water solubility, the problems that borneol is difficult to dissolve in water and difficult to prepare can be well solved, and in an inflammatory depression animal model, the bornyl ester compound shows good anti-inflammatory, anti-depression and cerebral apoplexy treatment effects and has great application prospects.

The invention discloses a preparation method and application of a controllable depolymerization and debonding high-performance epoxy adhesive. The preparation method comprises the following steps: S1, reacting an aldehyde monomer with an alcohol monomer to obtain a polyhydroxy intermediate containing an acetal structure; the aldehyde monomer has at least one hydroxyl functional group; the alcohol monomer has more than three hydroxyl functional groups; s2, carrying out ring-opening addition and alkaline environment ring-closing epoxidation reaction on epoxy chloropropane and the polyhydroxy intermediate to obtain an epoxy monomer containing an acetal dynamic bond; and S3, compounding the epoxy monomer obtained in the step S2 with a temperature-resistant epoxy monomer, and mixing and curing with an amine curing agent to obtain the controllable depolymerization debonding thermosetting adhesive under the acidic condition, the temperature-resistant epoxy monomer comprises at least one of an epoxy monomer containing a naphthalene ring structure and an epoxy monomer containing a biphenyl structure.

The invention relates to the technical field of benzamide, in particular to a preparation process of 4-hydroxythiobenzamide, which comprises the following steps: S1, preparing raw materials: preparing the 4-hydroxythiobenzamide from the following raw materials in parts by weight: 80-100 parts of formic acid, 80-100 parts of hydrochloric acid, 20-30 parts of 4-hydroxybenzaldehyde, 8-12 parts of hydroxylamine hydrochloride, 8-12 parts of thioacetamide and 4-6 parts of sodium hydroxide. According to the preparation method, after 4-hydroxybenzaldehyde is subjected to activating treatment reaction, part of positive charges on aldehyde carbon are dispersed, oxygen atoms in an acetal structure are connected with the aldehyde carbon through covalent bonds to generate an electron withdrawing induction effect, the reaction sequence and the reaction path of the 4-hydroxybenzaldehyde can be controlled through aldehyde activation, and the reaction efficiency of the 4-hydroxybenzaldehyde is improved. Therefore, the generation of byproducts is reduced, and the purity of a reaction product obtained from 4-hydroxybenzaldehyde is improved.

A method for applying a scavenger material to a wellbore includes providing a precursor scavenger material to a location within a wellbore extending through an earth formation, the precursor scavenger material comprising an acetal or a hydroxyaldehyde, reacting the precursor scavenger material in the wellbore or the earth formation in-situ to form a scavenger material comprising propenal, and reacting the scavenger material with at least one of hydrogen sulfide or a mercaptan to reduce a concentration of the at least one of hydrogen sulfide or the mercaptan. Related methods and systems for applying the scavenger material to the wellbore are also disclosed.

Derivatives of sabinene, and more particularly to sabinene carboxaldehyde and its derivatives described herein, as well as their synthesis and use in organoleptic applications is provided. The sabinene derivatives include a compound having a general Formula (1): wherein: • R 1 is selected from the group consisting of acetals, monothioacetals, (CH=CR 2) X(CHR) mOR 3, (CH=CR 2) X(CHR) nCHO, (CH = CR 2) X(CHR) pCN; and (CH = CR 2) X(CHR) qCO 2R 4; each R is independently selected from the group consisting of H or methyl;R is selected from the group consisting of H, methyl, and ethyl; • R 3 is selected from the group consisting of H, C1-C3 aliphatics, and C(O)R, where R 2 is H or ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, neopentyl, cyclopentyl, hexyl, isohexyl, neohexyl, or cyclohexyl; • R 4 is selected from the group consisting of C1-C3 alkyls; x is an integer equal to 0 or 1; and m, n, p, and q are integers independently selected from 0 to 7, with a proviso that when R and R 3 are each H, then x and m are not both equal to 0.

The invention belongs to the technical field of epoxy resin, and provides degradable epoxy resin containing a cyclic acetal structure and a preparation method and application thereof.The epoxy resin is based on alicyclic epoxy resin, the cyclic acetal structure is introduced into the alicyclic epoxy resin structure, the cyclic acetal structure has degradability under the acidic condition, and therefore the cyclic acetal structure can be degraded under the acidic condition; the rigidity of the annular structure is favorable for improving the mechanical property of the epoxy resin, and the finally obtained epoxy resin has the characteristics of good mechanical property, ultraviolet radiation resistance and suitability for the field of photocuring. According to the preparation method provided by the invention, 3-cyclohexene-1-formaldehyde and tetrahydric alcohol are taken as raw materials, and the epoxy resin is obtained through nucleophilic addition reaction and epoxidation reaction.

The invention discloses a method for synthesizing polyvinyl acetal with high acetalization rate by using acid with catalytic property and dispersity, and relates to the technical field of synthetic resin. The method comprises the following steps: dissolving polyvinyl alcohol in water to obtain a polyvinyl alcohol solution; adding a p-toluenesulfonic acid solution into the polyvinyl alcohol solution, then adding an aldehyde compound at the temperature of 25-30 DEG C, and after the aldehyde compound is added, continuing to react at the temperature of 25-30 DEG C to obtain the high-acetalization-rate polyvinyl acetal. According to the invention, p-toluenesulfonic acid is used as an acid catalyst and a dispersant at the same time, and preparation of the high-acetalization-rate polyvinyl acetal is realized under the condition of not adding any other surfactant or organic dispersant. The method not only realizes the preparation of the high-acetalization-rate polyvinyl acetal product, but also has the advantages of low preparation cost, simplicity in product separation and purification, recyclability of p-toluenesulfonic acid and the like.

The present invention relates to oriented, multilayer polyethylene films. In one aspect, a biaxially oriented, multilayer polyethylene film comprises: at least one inner layer comprising: (1) a polyethylene-based composition that comprises: (a) at least 97% by weight, based on the total weight of the polyethylene-based composition, of one or more polyethylenes having a density between 0.926 g / cm3 to 0.970 g / cm3 and a melt index (I2) between 0.1 to 10 g / 10 min; (b) 20 to 5000 ppm, based on the total weight of the polyethylene-based composition of a sorbitol acetal derivative comprising the structure of formula (I): wherein R1-R5 comprise the same or different moieties chosen from hydrogen and a C1-C3 alkyl.

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.

The present application relates to the technical field of electrochromic, and more particularly to a high-hydroxyl polyvinyl acetal flame-retardant interlayer for electrochromic soundproof glass, and a preparation method thereof.The preparation process comprises the following steps: adding polyvinyl butyral with low acetalization degree into N,N-dimethylformamide, heating and stirring to dissolve, then adding plasticizer and electrolyte salt in sequence, heating and stirring to dissolve, pouring into a mold, vacuumizing to remove bubbles, and heating to remove solvent, thereby obtaining the flame-retardant interlayer.The present application solves the problems of liquid leakage, easy volatilization and safety hazards of the existing liquid reversible metal electrodeposition electrochromic device.

To provide means to produce glycolaldehyde dialkyl acetal in high yield.SOLUTION: A production method includes a glycolaldehyde formation step of converting paraformaldehyde to glycolaldehyde in an ether type solvent in the presence of an N-heterocyclic carbene catalyst, and an acetalization step of treating the glycolaldehyde with an alcohol solution of hydrogen chloride to obtain glycolaldehyde dialkyl acetal. The glycolaldehyde formation step and the acetalization step are performed in a single container.SELECTED DRAWING: None

This invention provides a polynuclear metal cluster based on salicylaldehyde acetal-2-thiophenol ligand, its preparation method, and its application. The chemical formula of the polynuclear metal cluster is Co4(C 13 H9NOS)6·2CH3CN·CH3OH, where C 13 H9NOS is salicylaldehyde acetal-2-thiophenol, with Co forming a six-coordinate octahedral configuration with N, O, and S. The salicylaldehyde acetal-2-thiophenol ligand in the polynuclear metal cluster of this invention can effectively stabilize the active center of metallic cobalt, resulting in a polynuclear metal cluster with significant OER activity and broad prospects for practical applications.

This invention discloses a quantitative method for phospholipids, comprising: a sample preparation step, wherein a sample containing protein and phospholipids is mixed with Schiff reagent to obtain a sample for testing; a control sample preparation step, wherein the sample is mixed with a solvent of Schiff reagent to obtain a control sample; a measurement step, wherein the degree of a first optical property of the sample for testing and the degree of an optical property of the control sample are measured after the reaction of the aldehyde formed by the vinyl ether bond of phospholipids with Schiff reagent; and a determination step, wherein a correction degree obtained by correcting the degree of the first optical property using the degree of the optical property of the control sample is compared with the degree of a second optical property of the standard sample to determine the concentration of phospholipids in the sample, wherein the standard sample contains Schiff reagent and phospholipids of known concentration, and the degree of the second optical property is the degree of reaction of the Schiff reagent with the aldehyde formed by the vinyl ether bond of phospholipids.

The invention provides a synthesis method of 1-methyl-L-histidine, which comprises the following steps: firstly, carrying out methylation reaction on a compound 1 and N, N-dimethylformamide dimethyl acetal to obtain a compound 3; the compound 3 and NCS are subjected to a chlorination reaction, and a compound 4 is obtained; then reacting the compound 4 with diethyl acetamidomalonate to obtain a compound 5; then carrying out hydrolysis decarboxylation on the compound 5 to obtain a compound 6; and finally, splitting the compound 6 by using acetyl hydrolase to obtain a chiral compound 7 (namely 1-methyl-L-histidine). The synthesis route is short, the raw materials are cheap, the production cost can be reduced, the product yield and purity are high, and large-scale industrial production is facilitated.

The invention provides a non-contact temperature measurement system and temperature measurement method based on an organic phosphorescent material, and aims to solve the technical problem that the environment temperature cannot be monitored based on phosphorescent emission wavelength displacement due to performance limitation of the existing organic phosphorescent material. According to the non-contact temperature measurement system based on the organic phosphorescent material provided by the invention, the organic phosphorescent temperature-sensitive film is innovatively adopted to carry out temperature sensing on an object to be measured, and the organic phosphorescent temperature-sensitive film is obtained by mixing phosphorescent guest molecules, etherified cellulose and water according to a certain proportion, heating and melting the mixture, coating the mixture on a substrate and drying the substrate. Reversible aldehyde acetal can occur between phosphorescent guest molecules and the etherified cellulose, so that the phosphorescent emission wavelength of the formed organic phosphorescent temperature-sensitive film is subjected to red shift along with temperature rise, and the phosphorescent emission wavelength of the organic phosphorescent temperature-sensitive film can be analyzed; and the visual two-dimensional distribution monitoring of the continuous temperature within the temperature range of 77K-150K can be quickly and accurately realized.

The invention relates to a technical scheme for preventing metal corrosion caused by a cationic polymerization initiator containing fluorine atoms. A cationic polymerization initiator composition which contains a fluorine atom-containing cationic polymerization initiator (A) and a hydrophilic ether solvent (B) that does not have an acetal structure or an active hydroxyl group, and wherein the content of the hydrophilic ether solvent (B) is 2.5 mass% or more with respect to the total mass of the cationic polymerization initiator composition.

The invention discloses melamine formaldehyde resin and a production process thereof, and belongs to the technical field of high polymer materials. The production process comprises the following steps: carrying out a reaction on melamine and 2, 5-furandicarbonyl chloride to generate an intermediate, carrying out a condensation polymerization reaction on the intermediate, the melamine and formaldehyde, and adding a polyvinyl alcohol-metal complex for common condensation polymerization to form the melamine formaldehyde resin. 2, 5-furandicarbonyl chloride of a biological source is used for replacing part of formaldehyde, the content of methanol is reduced, meanwhile, a hydroxymethyl crosslinking site at one end of a furan ring can be closed, the crosslinking density is reduced, and the toughness is improved. Under the condition that the reaction energy is reduced by the metal ions, the polyvinyl alcohol and the formaldehyde are subjected to aldolization to block free formaldehyde; the coordination effect of metal ions and furan rings further promotes the crosslinking of polyvinyl alcohol and melamino-formaldehyde molecular chains, and the flexible long chain of the introduced polyvinyl alcohol reduces the brittleness of the resin material.

The invention provides a photochromic material as well as a preparation method and application thereof. The photochromic material has a molecular structure as shown in a formula I. In the formula I, R1 is a C1-C20 alkyl group, R2 is a propylidene group or an ethylidene aminopropyl group, R3 is a C1-C5 alkyl group, R4 is a C1-C20 alkyl group or aryl group, and a is 0 or 1. By chemically improving the molecular structure of the photochromic material, the compatibility of the photochromic material in an organic matrix can be improved, and meanwhile, through the combined action of specific groups (such as an active amino unit, a polar N, S-acetal unit and an aromatic ring skeleton), the rapid photochromic reaction and the adhesion with a base material can be further ensured; the color change stability is further improved, and the service life of a photochromic product is prolonged. # imgabs0 #

A resist composition which has as components a phenolic resin component, a photoactive 2,1,5-diazonaphthoquinonesulfonate component (PAC), a solvent component and that does not contain a photo acid generator (PAG). The PAC is a free PAC, a coupled PAC (PACb) or a combination thereof that includes a substituted or unsubstituted 2,1,5-DNQ material or compound onto which a substituted or unsubstituted 2,1,5-DNQ material is appended that, when UV exposed, do not form sulfonic acid. The phenolic resin component is a Novolak derivative in which some or all the free hydroxy groups are protected with an acid cleavable acetal moiety which can include a PACb moiety. A method whereby this composition is used in either thick or thin film photoresist device manufacturing methodologies.

The invention discloses a biodegradable polyester composition with controllable degradation time and a preparation method of the biodegradable polyester composition, and relates to the technical field of biodegradable materials. 20-40 parts by weight of carboxyl-terminated polylactic acid; 0.5 to 3.0 parts by weight of a bifunctional chain extender containing an acetal bond; 5 to 15 parts by weight of a polyethylene glycol-b-polycaprolactone block copolymer; 1-5 parts by weight of modified cellulose nanocrystals; and 0.1-0.5 part by weight of metal organic framework loaded lipase. By reasonably matching the components and optimizing the preparation process, the degradation time of the biodegradable polyester composition can be accurately controlled, and the degradation induction period and the complete degradation time can be adjusted as required. The compatibility of the components is good, the mechanical property and the processing stability of the material can be effectively improved, and the problem of inactivation or uneven dispersion of the components in the processing process is avoided.

The present invention relates to a nucleoside or nucleotide comprising a nucleobase attached to a detectable label via a cleavable linker, wherein the nucleoside or nucleotide comprises a ribose or 2' deoxyribose moiety and a 3'-OH blocking group, and the cleavable linker comprises a moiety of the structure: [Formula 1] TIFF2023531009000088.tif21128In formula, Each of X and Y is independently O or S; R 1a , R 2b , R 2 , R 3a and R 3b is independently H, halogen, unsubstituted or substituted C1-C6 alkyl, or C1-C6 haloalkyl. Also provided herein are methods for preparing such nucleotide and nucleoside molecules, and the use of fully functionalized nucleotides containing a 3' acetal blocking group for sequencing applications.

The application relates to a preparation method of 4-chloropyrrolopyrimidine, in particular to a four-step high-yield synthesis of 4-chloropyrrolopyrimidine by taking diethyl malonate and bromoacetaldehyde diethyl acetal as raw materials, through substitution reaction, then ring closure reaction with formamidine acetate, ring closure reaction under acidic conditions, and then chlorination reaction with phosphorus oxychloride; the preparation method of 4-chloropyrrolopyrimidine provided by the synthesis route is a preparation method with high yield, low cost, easy operation and suitability for industrialization.

The invention discloses a synthesis method of 2 '-O-methyladenosine, and belongs to the technical field of nucleoside synthesis and medicinal chemistry. According to the method, xylose which is rich in source is taken as an initial raw material, eight-step reaction including acetalation protection, acetylation, glycosylation, deacetylation, methylation, deacetalation protection, Mitsunobu reaction and secondary deacetylation is performed, reaction conditions of each step are accurately controlled, and finally, a target product is synthesized. The method has the advantages of high methylation reaction regioselectivity, mild reaction conditions, cheap and easily available raw materials and controllable cost, and overcomes the problems of poor methylation reaction regioselectivity, harsh reaction conditions and high cost in the existing synthesis method. The obtained product has important application value in the fields of research and development of antiviral drugs, design of nucleic acid probes and the like.

The invention aims to establish a synergistic catalytic system in which catalysts cannot coexist. The amide chiral catalyst is prepared through a series of synthesis. The hollow mesoporous COF-carboxylic acid / chiral amide multi-catalyst is prepared by a hydrothermal method. The morphology and the structure of the material are characterized by using a scanning electron microscope, a transmission electron microscope, an X-ray diffractometer, a specific surface instrument, an infrared spectrometer and the like, an asymmetric tandem-addition reaction is catalyzed to construct a chiral acetal compound, high performance liquid chromatography analysis is combined, and multiple catalysts are continuously recycled. Results show that the hollow mesoporous COF-carboxylic acid / chiral amide multi-catalyst not only has good morphology, excellent specific surface area and high porosity, but also enables contradictory catalysts to coexist for synergistic catalysis. The catalyst can be used for rapidly catalyzing an asymmetric tandem-addition reaction, high selectivity of ee = 99% and high yield of 98% are achieved, and the catalyst can be repeatedly used for 10 times. The method is green, environment-friendly, low in cost and suitable for concerted catalysis of catalysts which cannot coexist.

To provide an injection chemical composition that can achieve both curability in water and foaming and curability in non-water environments, even after being exposed to high temperature and high humidity environments. [Solution] An injection solution composition comprising a first agent (A) and a second agent (B), wherein the first agent (A) comprises an aqueous solution of sodium silicate (A-1), an organic polyol (A-2), and a tertiary amine catalyst (A-3), and the second agent (B) comprises an organic polyisocyanate containing a mixture of diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanate having 3 or more isocyanate functional groups (B-1), or a reaction product (B-1') of an active hydrogen group-containing compound and a mixture (B-1), at least one acid component (B-2) selected from the group consisting of phosphate monoesters and phosphate diesters, and at least one hydrolyzable component (B-3) selected from the group consisting of orthoester compounds and acetal compounds.

This invention discloses a method for preparing a key intermediate of iodopyridine, using dimethyl malonate as a raw material, and sequentially undergoing dihydroxylation S1 → acetalization S2 → hydrolysis and acidification S3 → decarboxylation S4 to obtain iodopyridine. The raw materials of this invention are inexpensive and readily available in the market, and the reaction efficiency is high, improving the purity and yield of the product. Intermediates 1 and 2 obtained from the process do not require separation and purification operations and can be directly used in the next step of the reaction. The purification effect is significant, yielding intermediate products with a purity ≥99%, and the total yield of the five steps is as high as 65-70%, which is beneficial for large-scale production.

This invention belongs to the field of organic chemical synthesis, specifically relating to a 3-amino-2-indolone compound containing a thioacetal skeleton, its synthesis method, and its applications. The synthesis method involves adding aryl-substituted dithioacetal and 1-substituted-3-imino-2-indolone as reactants to an organic solvent. The reaction is carried out under the synergistic catalysis of naphthol phosphate and a Cu metal catalyst at 2-5°C with stirring. The reaction is monitored by TLC until complete, followed by filtration, concentration, and purification to obtain the final product. The 3-amino-2-indolone compound synthesized in this invention possesses potential pharmaceutical activity due to its thioacetal skeleton. The reaction conditions of this invention are relatively conventional, the reaction process is mild, simple, and low-cost, suitable for large-scale industrial production, thus broadening the applicability of this method. A wide variety of substrates are used as reactants, resulting in structurally diverse products with high yields.