22 results about "Bond cleavage" patented technology

The present application relates to the technical field of organic synthesis, and particularly relates to a method for preparing (+)-crispine A by means of biological enzyme resolution. First, 6,7-dimethoxy-3,4-dihydroisoquinoline-2-oxide is subjected to 1,3-dipolar cycloaddition with allyl alcohol to obtain a first compound; then the first compound is added into a sulfonylation reagent and zinc powder to obtain a racemate second compound through a three-step continuous series reaction of primary alcohol sulfonylation, nitrogen-oxygen bond cleavage and ring formation; then the second compound is mixed with vinyl acetate and biological enzyme, and chiral resolution is carried out under the action of the biological enzyme to obtain a third compound with right-handed optical rotation and a fourth compound with left-handed optical rotation; finally, the third compound is mixed with an alkaline reagent and a sulfonylation reagent, and then secondary alcohol sulfonylation is carried out to obtain a fifth compound with right-handed optical rotation; the fifth compound is mixed with a deoxidizing reagent to carry out deoxidation reaction, and (+)-crispine A is prepared. The method is simple, green and environmentally friendly, and can be produced in large quantities.

This invention discloses a visible light-induced method for synthesizing α,β-unsaturated acetylide amides, belonging to the field of organic synthesis. The invention constructs a visible light-responsive aromatization-driven carbamoyl radical precursor—a dihydroquinazolinone derivative precursor containing a carbamoyl segment. Under direct visible light irradiation, a single-electron process is triggered, leading to C-C bond cleavage and aromatization, thereby efficiently releasing a carbamoyl radical in situ. Subsequently, this radical undergoes selective acetylation transfer and coupling with an acetylation-based high-valent iodine reagent, achieving the rapid construction of the target α,β-unsaturated acetylide amide. This process can be completed via a one-pot pathway of "visible light direct-driven—radical generation—acetylation transfer / coupling," avoiding the introduction of additional photocatalysts, making the reaction system simpler, the cost more controllable, and the post-processing more convenient.

This invention relates to a method for preparing deuterated compounds, using peroxides (such as D₂O₂) as the key deuterium source, which provides the deuterium atoms required for the reaction. When the peroxide comes into contact with the target compound and under the action of a selected catalyst, the energy of ultraviolet light can excite the reaction system, causing the OD bonds in the peroxide to break and releasing active deuterium atoms. These active deuterium atoms can then exchange with hydrogen atoms in the target compound, completing a hydrogen-deuterium substitution. The advantage of this method is that it can be operated under relatively mild conditions—that is, without the need for extreme temperature or pressure conditions—while still achieving high deuteration rates and yields. This means that this method may be more economically feasible on an industrial scale, reducing energy consumption and the generation of byproducts.

The application provides a preparation method of an electrocatalytic SCF-substituted dihydrofuran compound, and belongs to the technical field of compound preparation. The application uses diazonium and ethylene compounds as substrates, uses an SCF source as a sulfur-containing and fluorine-containing fragment donor, realizes a one-pot cascade reaction of ring formation through electrolysis, and thus constructs the SCF-substituted dihydrofuran compound. The raw material of the application has a wide source, uses electric current as a reaction driving force, avoids or reduces the use of additional photosensitizers and chemical oxidation-reduction reagents, and has the one-pot cascade characteristics of ring C-N bond breaking, C-O bond construction, trifluoromethylation and ring formation and the like, so that the step economy can be improved.

Gold(I) complexes capable of absorbing light in the near-UV and / or visible region, and methods of making and using the same, are described. These gold(I) complexes have photochemical reactivity, such as strong absorption of near-UV and / or visible light, quenching rate constants of > 3.5 x 10 5 s ‑1 This enables them to catalyze photoredox reactions under near-UV and / or visible light, such as homocoupling of organic halides (e.g., alkyl halides and aryl halides), alkylation of 2-phenyl-1,2,3,4-tetrahydroisoquinolines, cyclization of indoles, reductive dehalogenation of aryl halides, and / or C-H bond cleavage, among others. The yields of products of photo-induced organic reactions catalyzed by the gold(I) complexes described herein can be higher than the yields of the same products formed from the same reactions under the same reaction conditions using [Au2(μ-dppm)2](Cl)2, [Ru(bpy)3](Cl)2, and / or [fac-Ir(ppy)3] at the same or higher loading than the loading of the one or more gold(I) complexes.

The present disclosure relates in some aspects to methods, systems, and kits for using diphosphonic acid to promote N—O bond cleavage in a 3′ O—NH2 nucleotide in a cell or tissue sample. In some aspects, diphosphonic acid is used to promote N—O bond cleavage in a 3′ O—NH2 blocked reversible terminator during multiple cycles of a nucleic acid sequencing reaction in a cell or tissue sample. In some embodiments, the chemical reaction of the 3′ O—NH2 blocked reversible terminator with diphosphonic acid releases free alcohols and phosphoric acid derivatives, which are not damaging to the cell or tissue sample.

Crumb rubber obtained from recycled tires is subjected to a process involving photodissociation to break a sulfur bond, sulfur-sulfur and / or sulfur-carbon bonds. The process utilizes a component that generates photonic energy upon being subjected to a compressing force (e.g., pressure). The photonic energy is bandwidth resonant with the sulfur-sulfur and / or sulfur-carbon bond, causing the bond to break apart. The resulting rubber is suitable for use in applications typically utilizing virgin rubber, such as new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

This invention belongs to the field of industrial catalysis and bioenergy conversion technology, and relates to a method for selectively cleaving C-C bonds in lignin to prepare alkanes using a Ni-Co spinel catalyst and its applications. The method of selectively cleaving C-C bonds in lignin using a Ni-Co spinel catalyst can achieve efficient C-C bond cleavage under mild conditions (250~290°C, 2-4 MPa) and a hydrogen atmosphere, without the need for excessively high temperatures and pressures. It exhibits good cleavage activity for various C-C bond types in lignin (such as α-1, 5-5′, β-1, β-β′, etc.), showing broad substrate applicability. When used to prepare cycloalkanes from o-benzylphenol, the catalytic conversion rate can reach over 99%, and the cycloalkane yield can reach over 70%. The cycloalkane yield from the catalytic cleavage of real lignin ranges from 7% to 25%. The method of this invention does not require the use of precious metals and has low cost.

The invention discloses a light response type self-adaptive interface bridging agent, a preparation method thereof and application of the light response type self-adaptive interface bridging agent in mixed plastic recovery, and belongs to the technical field of high polymer material recovery. The interface bridging agent is symmetrical in molecular structure, the two ends of the interface bridging agent are 3-(trifluoromethyl)-3H-diaziridine bridging end groups capable of generating carbene, and the middle part of the interface bridging agent comprises an azobenzene photosensitive driving unit and a self-adaptive connecting unit (such as a disulfide bond). The core of the method is that illumination with different wavelengths is utilized: under ultraviolet irradiation, azobenzene is isomerized into cis-conformation, internal stress is generated to promote bond breakage of a connecting unit, and self-adaptive network dissociation is realized; under the irradiation of visible light, the azobenzene recovers trans-conformation, and the connection unit bonds are recombined to realize network reconstruction. When the mixed plastic is recycled, the interface bridging agent can reinforce interface bonding through a carbene insertion reaction to form a'molecular rivet ', and dissociation and reshaping of the material are realized through light-operated reversible regulation and control. According to the invention, remote, reversible and accurate regulation and control of the material performance are realized, the process is mild, the recovery efficiency of the incompatible mixed plastic and the performance of the regenerated product are obviously improved, and the method has a good application prospect.

The application discloses a kind of trinuclear tin complex, its preparation method and application in extreme ultraviolet lithography and electron beam lithography.The trinuclear tin complex has the following general formula I structure;It is prepared by the reaction of tin core with R1 substituent group modification and isophthalic acid with R2 substituent group modification according to the molar ratio of 1:1-2 in solvent;The trinuclear tin complex disclosed in the application connects different ligands, enhances the thermal chemical stability of the whole trinuclear tin complex, improves the EUV absorption rate, the molecular size is small, the composition is single, the Sn-C bond is broken during exposure to initiate high efficient solubility transformation, the sensitivity is far more than similar products, especially in electron beam lithography, performance revolution is improved.

The present application relates to the technical field of stereoselective monofluoroolefination of indolines at C7 position, in particular to a method for stereoselective C-H bond monofluoroolefination of indolines at C7 position catalyzed by ruthenium, comprising the following steps: under the action of a ruthenium catalyst and a base, carrying out C-H bond monofluoroolefination reaction of indolines represented by formula (I) with gem-difluoroalkenes represented by formula (II) or 3-(2,2-difluorovinyl)thiophene or 4-(2,2-difluorovinyl)benzo[d][1,3]dioxole to prepare compounds represented by formula (III). The present application uses inexpensive ruthenium catalyst, and through C-H bond activation / C-F bond cleavage, a series of Z-type alpha-monofluoroolefination pyridine indolines are obtained, and the method has strong site and stereoselectivity, is efficient and low in cost. In addition, the target compounds obtained by synthesis have certain antibacterial activity, and can provide a basis for the development of such lead compounds.

The invention relates to the use of a monomer according to formula (1) for producing a bond break in a polymer that is obtained from at least one monomer according to formula (1), wherein the bond break is induced by applying an electrical voltage across the polymer, and to a method for the electrochemical disintegration of such a polymer. The invention further relates to polymerisable monomers according to formula (1) and polymers obtained therefrom.

The application discloses a preparation method of an acousto-optic catalyst for catalyzing the cleavage of ether bonds in lignin, and belongs to the technical field of photocatalytic materials. 2+ The intercalation method is used for in-situ synthesis of ZnO in the layer spacing of MoS2, MoS2 / ZnO heterojunction catalyst is constructed, and the catalyst has strong piezoelectric response capability. The problems of traditional photocatalysts, such as fast recombination of photo-generated carriers and low mechanical energy utilization rate, are solved, and the shortcoming of the reduction of catalytic energy level after the construction of the heterojunction is also solved. Under the acousto-optic combined action, a large number of beta-O-4 bonds are broken, and high product selectivity is simultaneously achieved. The method is simple in operation and has significant technical advantages.

Provided is a method for depositing a film comprising a transition metal chalcogenide, the method comprising the steps of: injecting a transition metal precursor and a chalcogen precursor into a chamber; and reacting the transition metal precursor with the chalcogen precursor to deposit a film comprising a transition metal chalcogenide on a substrate, wherein the chalcogen precursor comprises a chalcogen-to-chalcogen bond, and a bond decomposition energy of the chalcogen-to-chalcogen bond is 275 kJ / mol or less.

A method and apparatus for monitoring and / or controlling the extent of denaturation and / or bond cleavages of proteins on any surface (e.g., biological tissues, biofilms, etc.). In one embodiment, a low power laser (e.g., a 5 mW, 362 nm diode laser) is directed through a biological sample to a photodetector. The sample is heated by a set of radiant heaters to between about 220° C. and about 250° C. in a time period of between 10 seconds to 60 seconds. The baseline transmissivity of the sample is monitored continuously throughout treatment of the biological sample via continuous monitoring of the signal voltage detected at the photodetector. Upon detection of increase in relative transmissivity in the biological sample, the heating treatment is concluded and the biological sample is removed for in situ protein identification as part of an imaging MALDI-MS measurement.

The invention discloses an Off-On type fluorescent probe compound, the chemical name of the Off-On type fluorescent probe compound is thiocarbonic acid O-(2-butyl-1, 3-dioxo-2, 3-dihydro-1H-benzo [de] isoquinoline-6-yl) O-(4-fluorophenyl) ester (short for 2B6NI-4FP-TC), a preparation method of the Off-On type fluorescent probe compound and application of the Off-On type fluorescent probe compound to detection of mercury ions in complex matrix samples such as ashing soil and tea leaves. During detection, Hg < 2 + > is combined with sulfur atoms of thiocarbonate and catalyzes ester bond breakage, 4-OH of a fluorescent parent nucleus is exposed, and a system fluorescent signal is remarkably amplified. The probe has extremely high selectivity and sensitivity, the detection limit is as low as 1.5 * 10 <-8 > M, the stability in a wide pH range is good, qualitative and quantitative detection of Hg < 2 + > can be realized through visual colorimetry and fluorescence spectrum, and the probe is particularly suitable for rapid and high-throughput detection of trace Hg < 2 + > in complex matrix samples such as traditional Chinese medicines and tea leaves subjected to ashing treatment.

The invention discloses a ternary composite metal organic framework material Pd (at) NSB / g-CN as well as a preparation method and application of the ternary composite metal organic framework material Pd (at) NSB / g-CN. The preparation method comprises the following steps: (1) taking FeCl3. 6HO and 2-aminoterephthalic acid as raw materials, synthesizing NH-MIL-88B (Fe) through a solvothermal method, and adding g-CN particles in the synthesis process to obtain NSB / g-CN; and (2) dissolving the NMB / g-CN in a solvent through a deposition method, and adding the Pd nanoparticles to obtain the ternary composite metal organic framework material Pd (at) NMB / g-CN. According to the ternary composite metal organic framework material Pd (at) NSB / g-CN constructed by the invention, the utilization rate of visible light is increased, and C-Br bond breakage and debromination reaction are promoted, so that the visible light degradation efficiency of BDE47 is improved.

This invention discloses a photosensitive nitric oxide donor that targets both lysosomes and mitochondria, its preparation method, and its applications, belonging to the fields of biomedical materials and medicinal chemistry. The nitric oxide donor has a structure as shown in formula DNOD560, which simultaneously includes a morpholino group for lysosome targeting and a rhodamine fluorophore for mitochondrial targeting, and uses an N-nitroso bond as the photosensitive nitric oxide release unit. The donor undergoes fluorescence quenching under physiological conditions and can undergo N-N bond cleavage under specific wavelength (e.g., 365 nm) illumination, quantitatively releasing nitric oxide and simultaneously generating the strongly fluorescent product DLMF560, enabling self-reporting and visualization of the release process. This donor has advantages such as high release efficiency (95% release efficiency within 70 minutes) and good photostability. Crucially, co-localization experiments have confirmed that it can simultaneously target lysosomes and mitochondria in cells, achieving in-situ, photosensitive release of nitric oxide at the subcellular organelle level, and has been successfully applied to live-cell (A549) imaging, providing a novel tool for studying the function of nitric oxide in subcellular organelles and developing precision treatment strategies.

The invention relates to the use of a monomer according to formula (1) for generating a bond cleavage in a polymer obtained from at least one monomer according to formula (1), wherein the bond cleavage is induced by applying an electrical voltage across the polymer, and to methods for the electrochemical disintegration of such a polymer. The invention further relates to polymerizable monomers according to formula (1) and polymers obtained therefrom.

The present application relates to oxime ether compound Z-selective monofluoroalkenylation technical field, specifically relates to a kind of ruthenium catalysis benzophenone oxime ether compound Z-selective C-H bond monofluoroalkenylation method, comprising the following steps: under the action of ruthenium catalyst, base, formula (I) shown benzophenone oxime ether compound and formula (II) shown geminal difluoroalkene class compound are carried out C-H bond monofluoroalkenylation reaction, and the compound shown in formula (III) is prepared;Wherein, R is independently selected from any one of C1-C6 alkyl;R1, R2, R3 are respectively independently selected from any one of hydrogen, C1-C6 alkyl, C1-C6 alkoxy, halogen, thiophene, C6-C 14 The present application uses inexpensive metal ruthenium catalysis, with oxime ether as positioning base, with geminal difluoroalkene as coupling pair, to obtain a series of Z-type α-monofluoroalkenylation benzophenone oxime ether compound by C-H bond activation / C-F bond cleavage, and the method has strong configuration selectivity, high efficiency and low cost.

The invention relates to application of a protection strategy based on pyridylmethyl photocatalysis carbon heterobond breakage in solid-phase polypeptide synthesis. The invention firstly provides an amino acid building block protected by a Pic (picolyl) protecting group, and then utilizes the amino acid modified by the Pic protecting group to carry out solid-phase polypeptide synthesis. The method comprises the following steps: sequentially carrying out deprotection and coupling on an amino acid building block with a Pic protecting group on resin to synthesize a polypeptide chain with a protecting group; and then carrying out visible light irradiation on the synthetic resin in the presence of a reducing agent, a photocatalyst and a buffer solution with the pH value of 4-5 to complete peptide fragment protecting group removal so as to generate a polypeptide product. According to the method, a Pic protecting group is introduced to replace a traditional tBu side chain protecting group, and a photocatalytic deprotection technology under a visible light condition is combined, so that the side chain protecting group is mildly and efficiently removed, and TFA (Trifluoroacetic Acid) used in a traditional method and adverse effects caused by the TFA are avoided.

Disclosed are plasma-free methods for growing crystalline metal nitride films using intact molecular nitrogen (N2) and in-situ metal-assisted N≡N bond cleavage on a metal-terminated surface. The method includes: providing a substrate bearing a nitride film that is metal-terminated; exposing the surface to N2 in the absence of plasma to adsorb intact N2; delivering metal atoms that activate and cleave the N≡N bond, producing surface-bound nitrogen and an N-terminated region with partial metal coverage; and adsorbing additional metal to complete a crystalline nitride layer, with repetition for multilayer growth. Metals include transition, rare-earth, and actinide elements, enabling binary films (e.g., ScN) and ternaries of the form M1xM21-XN, including, but not limited to, ScxNb1-xN and ScxAI1-xN with controlled x. Metal delivery can be performed by molecular beam epitaxy, thermal chemical vapor deposition, thermal atomic layer deposition, or thermal laser epitaxy under vacuum and substrate heating.