30 results about "Methylcyclopentadiene" patented technology

The invention discloses a method for synthesizing a platinum-based nitrogen-doped graphdiyne catalyst based on an atomic layer deposition technology and application of the platinum-based nitrogen-doped graphdiyne catalyst. Firstly, hexabromobenzene and calcium carbide are subjected to vacuum ball milling, calcination and purification to obtain a graphdiyne carrier, then the graphdiyne carrier and melamine are mixed and calcined to achieve nitrogen doping of the carrier, and then loading of platinum nanoparticles is accurately controlled through an atomic layer deposition technology. According to the method, the characteristics of an atomic layer deposition technology are utilized, deposition parameters and the number of cycles are controlled, uniform distribution and size control of Pt nano-particles on porous graphdiyne are achieved, and a nitrogen-doped graphdiyne carrier and the platinum nano-particles have a synergistic effect. The platinum-based nitrogen-doped graphdiyne catalyst prepared by the invention has the specific surface area of 734.8 m < 2 > g < 1 > and the average pore size of 8.68 nm, and shows excellent electrocatalytic activity and dynamic performance in reaction.

The invention relates to a preparation method of trimethoxy pentamethyl cyclopentadienyl titanium, which comprises the following steps: (1) vacuumizing a reactor for replacement, detecting the content of moisture and oxygen in gas in a reaction kettle by an instrument, and stopping vacuum replacement when the content is lower than 50ppm; (2) pentamethyl cyclopentadienyl titanium trichloride, ammonia and a solvent are added into a reactor, methanol is dropwise added into the reactor, a crude product trimethoxy pentamethyl cyclopentadienyl titanium is obtained through a reaction, the reaction temperature ranges from-30 DEG C to 50 DEG C, and the pressure ranges from-0.05 MPa to 0.05 MPa; (3) filtering and desalting the crude product trimethoxy pentamethyl cyclopentadienyl titanium obtained in the step (2) in an inert environment; and (4) the filtrate obtained in the step (3) is refined, pure trimethoxy pentamethyl cyclopentadienyl titanium is obtained, and the metal purity reaches 5N. Methanol is used as a raw material, the synthesis route can be shortened, the cost is reduced, and meanwhile, the material is relatively safe.

The invention relates to the technical field of gas adsorption materials, in particular to a heteropoly acid modified GO-coated MMT composite material and a preparation method and application thereof. The preparation method comprises the following steps: ultrasonically dispersing graphite oxide in deionized water, stirring for 2-4 hours to obtain a graphite oxide solution, adding methylcyclopentadienyl manganese tricarbonyl into ethylene glycol, and stirring for 12-24 hours to obtain an MMT solution; pouring the graphite oxide solution into the MMT solution, reacting at 150-180 DEG C for 8-12 hours, washing, and freeze-drying to obtain GO-coated MMT composite hydrogel; and adding the GO-coated MMT composite hydrogel into deionized water, then adding heteropoly acid, stirring at 60-80 DEG C for 8-12 hours, and carrying out suction filtration and washing to obtain the heteropoly acid modified GO-coated MMT composite material. According to the heteropolyacid modified GO (at) MMT composite material disclosed by the invention, a complex with strong electrostatic adsorption force can be formed on the surface of GO (at) MMT by introducing heteropolyacid, and meanwhile, Bronsted acid sites and Lewis acid sites are increased, so that the adsorption performance is enhanced, and low-concentration ammonia gas adsorption is realized.

The application discloses a high-activity 8-hydroxyquinoline rhodium complex in vivo and in vitro and a synthesis method and application thereof. The 5,7-dichloro-8-hydroxy-2-methylquinoline, dichloro (pentamethylcyclopentadienyl) rhodium (III) dimer, methanol, dimethyl sulfoxide and triethylamine are taken, and under a closed condition, the reaction is carried out at 80 DEG C for 3 days; after being cooled to 37 DEG C, filtration and drying are carried out, and the 5-chloro-8-hydroxyquinoline rhodium complex is obtained. The 5-chloro-8-hydroxyquinoline rhodium complex has obvious inhibiting effect on SK-OV-3 and SK-OV-3 / DDP cancer cells, shows superior antitumor activity, and has small toxicity to normal HL-7702 cells; the 5-chloro-8-hydroxyquinoline rhodium complex has potential medicinal value and is expected to be used for preparation of various antitumor drugs.

Provided are: bis(alkylcyclopentadienyl)tin or bis(alkyltetramethylcyclopentadienyl)tin having a high vapor pressure even at lower temperatures, typified by bis(ethylcyclopentadienyl)tin; a precursor for chemical vapor deposition containing any of the above-mentioned organotin compounds as a main component; and a method of producing a tin-containing thin film by an atomic layer deposition process using the precursor for chemical vapor deposition. A precursor for chemical vapor deposition containing bis(alkylcyclopentadienyl)tin or bis(alkyltetramethylcyclopentadienyl)tin represented by the following Formula (1) as a main component: (In Formula (1), R1 and R2 each independently represent hydrogen or an alkyl group having 6 or less carbon atoms, and R3 and R4 each independently represent an alkyl group having 6 or less carbon atoms.)

The invention relates to a preparation method of tris (methyl cyclopentadienyl) yttrium, which comprises the following steps: under a protective atmosphere, S1, carrying out first heating reaction on yttrium chloride and methyl cyclopentadienyl sodium in the presence of a first organic solvent, and adding an organic ligand to carry out second heating reaction after full reaction to obtain an intermediate product; the organic ligand is lithium bis (trimethylsilyl) amide and / or potassium bis (trimethylsilyl) amide; and S2, carrying out a stirring reaction on the intermediate product and methyl cyclopentadiene in the presence of a second organic solvent, filtering, collecting filtrate, and removing the solvent to obtain the tri (methyl cyclopentadienyl) yttrium. According to the preparation method, chlorine which is not substituted by methyl cyclopentadienyl in N (TMS) 2-substituted yttrium chloride is introduced and then substituted by methyl cyclopentadiene to prepare tris (methyl cyclopentadienyl) yttrium, so that the substitution efficiency of chlorine in the raw material yttrium chloride can be effectively improved, the yield of a target product is greatly improved and can reach 86%, and the purity can reach 5N.

The invention relates to the technical field of chemical reaction engineering, and discloses a continuous production and preparation method and system of methyl tetrahydrophthalic anhydride, and the method comprises the following steps: establishing a three-stage DielsAlder reactor of dehydrated amount methyl cyclopentadiene and filtered maleic anhydride, preheating and mixing the dehydrated amount methyl cyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage DielsAlder reactor, and carrying out continuous production and preparation on the dehydrated amount methyl cyclopentadiene and the filtered maleic anhydride based on the second stage of the three-stage DielsAlder reactor; a mixed reactant is obtained; carrying out catalytic reaction on the mixed reactant by utilizing the second stage of the three-stage DielsAlder reactor to obtain a catalytic reaction compound, and carrying out ionic liquid catalytic enhancement on the catalytic reaction compound by utilizing the third stage of the three-stage DielsAlder reactor to obtain an enhanced reaction compound; recording the infrared spectrum of the enhanced reaction compound to calculate the MCPD conversion rate of the enhanced reaction compound, desolventizing the enhanced reaction compound to obtain methyl tetrahydrophthalic anhydride, and isomerizing the methyl tetrahydrophthalic anhydride to obtain the target methyl tetrahydrophthalic anhydride. According to the invention, the preparation efficiency of methyl tetrahydrophthalic anhydride can be improved.

The present invention discloses a silicon-based negative electrode material, its preparation method, and application. The main material of the negative electrode material is a tin-doped pre-magnesium silicon oxide material, on the surface of which a carbon layer and a molybdenum disulfide-doped polyphenylene sulfide coating layer are sequentially coated. The preparation method is as follows: S1, silicon, silicon dioxide, and tin are crushed, mixed, and tableted; S2, the tableted material obtained in S1 is sintered to obtain a tin-doped silicon oxide material; S3, the product S2 is crushed and classified to control the particle size distribution; S4, the product S3 is placed in a rotary kiln under an inert atmosphere and heated to the sintering temperature, dimethylcyclopentadienyl magnesium is placed in a gas reactor, sintered, and discharged at room temperature to obtain an intermediate product A; S5, product A and molybdenum disulfide are dispersed in acetylacetone, diphenyl disulfide is added, oxygen is introduced for reaction, and the temperature is raised a second time under a nitrogen atmosphere to obtain a silicon-based negative electrode material coated with molybdenum disulfide-doped polyphenylene sulfide.

The application belongs to the technical field of organic synthesis chemistry, and discloses a rhodium-catalyzed diversity-oriented synthesis method of asymmetric 1,3-diynes and conjugated enynes compounds. The asymmetric 1,3-diynes and conjugated enynes compounds have structures shown in the following formula (I) and formula (II) respectively. The two types of target compounds are prepared according to the following steps: alkynol (1 equivalent), silver trifluoromethanesulfonate (1.5 equivalents) and 5 mol% dichloro (pentamethylcyclopentadienyl) rhodium (III) dimer ([Cp*RhCl2]2) are sequentially added into a dry Schlenk flask, DMF (N,N-dimethylformamide) is used as a solvent, and the reaction is stirred at room temperature in an argon atmosphere for 4 hours (the reaction process is monitored by TLC or LC-MS). After the reaction is completed, ethyl acetate (15 mL*3) is added for extraction three times, the organic phase is combined and washed with saturated brine (10 mL*2) twice. The organic phase is collected and dried with anhydrous sodium sulfate, filtered, and the filtrate is rotary dried and then separated and purified by silica gel column chromatography, so that the asymmetric 1,3-diynes and conjugated enynes compounds are finally obtained. The asymmetric 1,3-diynes and conjugated enynes compounds are synthesized by the diversity-oriented synthesis method, and the method has the characteristics of mild conditions and simple operation.

This invention discloses a synthesis process for methylnadic anhydride, comprising the following steps: maleic anhydride is dissolved in a solvent, and methylcyclopentadiene or a starting material containing 60-98 wt% methylcyclopentadiene is added dropwise at a uniform rate at 10-60°C to carry out a synthesis reaction, wherein the mass ratio of methylcyclopentadiene to maleic anhydride is (0.5-1.2):1; after the reaction is completed, light components are removed under reduced pressure, the light components including the solvent, unreacted methylcyclopentadiene and its dimer, and then isomerization is carried out at 140-200°C to obtain methylnadic anhydride.

The application relates to a preparation method of tris (methylcyclopentadienyl) yttrium, which comprises the following steps: S1, under a protective atmosphere, carrying out first heating reaction of yttrium chloride and sodium methylcyclopentadienyl in the presence of a first organic solvent, adding an organic ligand to carry out second heating reaction after sufficient reaction, and obtaining an intermediate product; the organic ligand is lithium di (trimethylsilyl) amide and / or potassium di (trimethylsilyl) amide; S2, carrying out stirring reaction of the intermediate product and methylcyclopentadiene in the presence of a second organic solvent, filtering to collect filtrate, and removing a solvent to obtain tris (methylcyclopentadienyl) yttrium. ‑ The application can effectively improve the substitution efficiency of chlorine in raw material yttrium chloride by introducing N(TMS)2 ‑ substituting chlorine in yttrium chloride which is not substituted by methylcyclopentadienyl, and then substituting methylcyclopentadiene to prepare tris (methylcyclopentadienyl) yttrium, so that the substitution efficiency of chlorine in the raw material yttrium chloride can be effectively improved, the yield of the target product can be greatly improved, can be as high as 86%, and the purity can reach 5N.

The invention discloses a metallocene catalyst, a preparation method thereof and an application of the metallocene catalyst in olefin polymerization, the preparation method comprises the following steps: (1) adding a raw material 1, a catalyst pentamethylcyclopentadienyl rhodium dimer and a raw material 2 into a first organic solvent, and reacting at 20-100 DEG C for 1-10 hours to obtain an intermediate 1; adding organic amine into the intermediate 1, reacting at 30-100 DEG C for 3-6 hours, filtering, concentrating and recrystallizing to obtain an intermediate 2; the raw material 1 is a Meldrum's acid methylene derivative; the raw material 2 is an acetylene derivative; and (2) adding a second organic solvent into the intermediate 2, adding a strong alkaline substance into the intermediate 2 at-40 to 0 DEG C, stirring and reacting for 1-10 hours, adding halide of M at-20 to 40 DEG C, continuously reacting for 3-24 hours, removing the solvent in vacuum, washing and drying in vacuum. When the catalyst is used for olefin polymerization, the catalytic activity is good, and the molecular weight of the obtained polymer is high.

The utility model belongs to the technical field of chemical equipment, and particularly relates to a dimethyl cyclopentadiene efficient depolymerization device which comprises a depolymerization kettle, a material tank, a collection box, a filter plate, a stirring assembly, a feeding pipe, a flow regulating valve and a feeding pipe, a plurality of supporting legs are fixedly installed on the bottom side of the material tank, the bottom ends of the multiple supporting legs are all fixedly installed on the top of the depolymerization kettle, the feeding pipe is fixedly installed at the bottom of the material tank and communicated with the depolymerization kettle, the flow adjusting valve is fixedly installed on the feeding pipe, and the filtering plate is fixedly installed on the inner side wall of the material tank. And the stirring assembly is arranged in the material tank and is matched with the filter plate. The dimethyl cyclopentadiene raw material filtering device is reasonable in design, impurities in dimethyl cyclopentadiene raw materials can be effectively filtered out, meanwhile, the blockage condition caused by the condensation phenomenon of the raw materials in the feeding pipeline due to the low air temperature can be avoided, and the condition that the depolymerization reaction is forced to suspend due to feeding interruption caused by blockage is avoided.

The invention relates to the technical field of catalysts, and discloses an organosilicon-related 3D printing photocuring platinum catalyst and a preparation method thereof, the 3D printing photocuring platinum catalyst comprises 0.30-0.60 part of an active component, 0.50-1.50 part of a light synergist, 95.90-99.20 parts of a functional carrier and 0-2.00 parts of an auxiliary solvent; the active component is selected from trimethyl (cyclopentadienyl) platinum or trimethyl (methyl cyclopentadienyl) platinum. The preparation method comprises the following steps: mixing the carrier with the auxiliary solvent; heating and dissolving the light synergist to prepare a premixed solution; after cooling, adding active components in a dark place and dispersing; and filtering to remove impurities to obtain a finished product. Through a photoinduced electron transfer mechanism, storage stability and illumination transient curing without an inhibitor are achieved, the problems of curing delay and catalyst precipitation are solved, and the forming precision is improved.

The invention relates to the technical field of metal precursor synthesis, in particular to a preparation method of tris (methylcyclopentadienyl) yttrium. The preparation method of the tris (methylcyclopentadienyl) yttrium comprises the following steps: dropwise adding a methylcyclopentadiene monomer into yttrium hydride under the protection of inert gas at a certain temperature, reacting for a period of time, filtering, distilling, and finally purifying at absolute pressure to obtain the tris (methylcyclopentadienyl) yttrium, the steps are simple, the dangerousness of synthetic raw materials is small, a solvent does not need to be replaced in the synthetic process, no by-product is generated, and the method is suitable for industrial production. The subsequent purification steps are simple, kettle residues after the reaction are easy to treat, the treatment risk is small, and a simple, safe and efficient method is provided for synthesis of the tris (methylcyclopentadienyl) yttrium.

This invention discloses an anti-drug-resistant lung cancer compound, its preparation method, and its applications. The invention involves reacting 5-chloro-8-hydroxyquinoline, dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer, methanol, dimethyl sulfoxide, and triethylamine under sealed conditions at 80 °C for 3 days. After cooling to 37 °C, the mixture is filtered and dried to obtain the final product. The 5-chloro-8-hydroxyquinoline rhodium complex exhibits superior antitumor activity by targeting and inhibiting the growth of lung cancer cells A549 and cisplatin-resistant lung cancer cells A549 / DDP, while showing low toxicity to normal HL-7702 cells. It possesses potential pharmaceutical value and is expected to be used in the preparation of various antitumor drugs.

The application belongs to the technical field of compound synthesis, and discloses a method for rhodium-catalyzed synthesis of unnatural beta-amino acid compounds, which comprises the following steps: taking a compound shown in formula I and a compound shown in formula II as raw materials, and under the action of a rhodium catalyst, an additive and a solvent, a beta-amino acid compound shown in formula III is synthesized through a reaction under the conditions of an inert atmosphere and heating; the rhodium catalyst is dichloro (pentamethylcyclopentadienyl) rhodium (III) dimer. The application uses metal rhodium catalysis, does not need silver additive or external oxidant, and synthesizes various unnatural beta-amino acid compounds through high regioselective spirocyclization reaction of a substrate, conversion of trifluoroacetyl into a carboxylic acid group under the action of a strong base, and carbon-hydrogen activation in one pot, so that the steps are simple and the applicable substrates are wide.

This invention provides a method for preparing tris(methylcyclopentadienyl)yttrium. This method can efficiently remove key impurities, simplifying the process while effectively improving the purity and yield of tris(methylcyclopentadienyl)yttrium. The preparation method includes the following steps: S1, under an inert atmosphere, methylcyclopentadiene and a bis(trimethylsilyl)amino potassium salt solution are mixed at a temperature ≤30°C, and then the temperature is raised to 75-85°C for reaction; after the reaction, the mixture is filtered under reduced pressure to obtain a cyclopentadienyl potassium salt intermediate; S2, under an inert atmosphere, yttrium trichloride and the cyclopentadienyl potassium salt intermediate are mixed in the presence of a solvent, and then the temperature is raised for reaction; after the reaction, the mixture is filtered, the filtrate is collected, and the filtrate is concentrated under reduced pressure to obtain a crude product; S3, the crude product is pretreated by reduced pressure distillation to obtain a pretreated product; then, it is sublimated under vacuum to obtain the tris(methylcyclopentadienyl)yttrium.

This invention discloses a method for manufacturing a Y₂O₃ thin film, a method for forming a protective coating material for semiconductor manufacturing components, and a semiconductor manufacturing component. The objective of this invention is to provide a method for manufacturing a Y₂O₃ thin film that exhibits resistance to high-density fluorocarbon-based plasma. To achieve this objective, this invention uses bis(methylcyclopentadienyl)(N'-isopropyl-N-n-propylacetamidinate)yttrium (Y(MeCp)₂(iPr-nPrAMD)) as a precursor to manufacture an ALD-Y₂O₃ thin film.

This invention relates to a method for preparing bis(pentamethylcyclopentadienyl)ruthenium(II), belonging to the field of noble metal organometallic compound synthesis technology. The method involves de-airing a solvent and pentamethylcyclopentadiene to obtain a pretreated solvent and pretreated pentamethylcyclopentadiene, respectively. Under a protective atmosphere, ruthenium chloride is dissolved in the pretreated solvent to obtain a ruthenium solution. A reducing agent and pentamethylcyclopentadiene are added sequentially to the ruthenium solution, and the mixture is heated uniformly to 50-90°C and stirred for 4-10 hours. After cooling and crystallization, the solid and liquid are separated. The solid is washed sequentially with deionized water and methanol, and dried to obtain crude bis(pentamethylcyclopentadienyl)ruthenium(II). The crude bis(pentamethylcyclopentadienyl)ruthenium(II) is dissolved in hot anhydrous ethanol, filtered to remove impurities, and the filtrate is cooled and crystallized. After solid-liquid separation, the solid is dried to obtain high-purity bis(pentamethylcyclopentadienyl)ruthenium(II). This invention has a simple method, a product yield greater than 74%, and a purity of over 98%.

The invention relates to an industrial preparation method of methyl nadic anhydride, which comprises the following steps: (1) feeding a solvent into an addition reaction kettle, mixing the solvent with maleic anhydride and an isomerization catalyst which are added through a spiral feeder, and then feeding methyl cyclopentadiene into the addition reaction kettle for addition reaction; (2) feeding the material after the addition reaction from the middle lower part of a filter, filtering out unreacted maleic anhydride and an isomerization catalyst from the bottom, feeding the material at the top of the filter into a desolventizing tower, returning a solvent obtained at the tower top to the addition reaction kettle, and obtaining crude methyl nadic anhydride at the tower bottom; and (3) feeding the methyl nadic anhydride into a refining tower, extracting by-products from the tower top, and obtaining the methyl nadic anhydride from the tower bottom. The method is simple to operate, low in cost, low in requirements on used equipment and suitable for large-scale production, and the purity of the obtained methyl nadic anhydride is greater than 99%.

The invention relates to the technical field of chemical synthesis, and discloses a preparation method of 1, 2, 3, 4-tetramethyl-1, 3-cyclopentadiene. The method comprises the following steps: under the catalytic action of an acidic ionic liquid catalyst, 2, 3, 4, 5-tetramethyl-2-cyclopentenol is subjected to a dehydration reaction in a first organic solvent, and the acidic ionic liquid catalyst is at least one of an acidic ionic liquid, a Lewis acidic ionic liquid and a composite acidic ionic liquid. The 1, 2, 3, 4-tetramethyl-1, 3-cyclopentadiene prepared by the method disclosed by the invention has the advantages of high product selectivity, easiness in product separation, high yield, capability of recycling the catalyst for multiple times and the like.

This invention belongs to the field of chemical production technology, specifically disclosing a purification method for trimethoxy(pentamethylcyclopentadienyl)titanium, comprising the following steps: vacuum distillation of crude trimethoxy(pentamethylcyclopentadienyl)titanium raw material to obtain a crude distillate; adding 5-20 parts by mass of a modifier to 100 parts by mass of the crude distillate, wherein the modifier is at least one selected from triethylene glycol dibutyl ether, tetraethylene glycol dibutyl ether, n-heptadecane, n-octadecane, and mineral oil, and then distilling to obtain the product. This invention achieves large-scale purification of Star-Ti, achieving a distillation yield of over 75%, with a maximum of over 95%, and obtaining a high-purity product with an organic purity of over 99.5%, solving the problems of difficult large-scale purification, difficulty in purity improvement, and low recovery rate of Star-Ti in existing technologies.

The application discloses a method for synthesizing a nickel-modified platinum-based nitrogen-doped graphdiyne catalyst based on an atomic layer deposition technology and application thereof, and the method comprises the following steps: vacuum ball milling and calcining and purifying hexabromobenzene and calcium carbide to obtain a graphdiyne carrier; mixing and calcining the carrier and melamine to realize nitrogen doping of the carrier; using atomic layer deposition technology to load platinum nanoparticles on the nitrogen-doped graphdiyne by taking trimethylcyclopentadienyl platinum (MeCpPtMe3) as a platinum source; and using atomic layer deposition technology to deposit an ultrathin nickel layer on the surface of the platinum nanoparticles by taking nickelocene (NiCp2) as a nickel source to obtain the catalyst. The method utilizes the atomic-level surface regulation characteristics of the atomic layer deposition technology, and realizes effective optimization of the electronic structure of the surface of the platinum nanoparticles by accurately controlling the deposition cycle number of nickel. The nickel-modified platinum-based nitrogen-doped graphdiyne catalyst prepared by the method exhibits excellent electrocatalytic activity and kinetic performance, and provides a high-efficiency low-platinum catalyst solution for a zinc-air battery.

A method for manufacturing a Y2O3 thin film capable of exhibiting resistance to fluorocarbon-based high-density plasma is described. An ALD-Y2O3 thin film is manufactured using bis(methylcyclopentadienyl)(N′-isopropyl-N-n-propylacetamidinate) yttrium (Y(MeCp)2(iPr-nPrAMD)) as a precursor.

The utility model belongs to the technical field of organic synthesis equipment, and particularly relates to a monomethyl cyclopentadiene dripping type cyclic sodium reaction device which comprises a support frame, a cyclic sodium reaction kettle, two liquid storage tanks, a mounting frame, a driving component, a hollow shaft, a stirring component, two dripping feeding components and a reaction endpoint judging component, the cyclic sodium reaction kettle and the two liquid storage tanks are fixedly installed on the supporting frame, the two liquid storage tanks are located on the two sides of the cyclic sodium reaction kettle respectively, the two dropwise adding and feeding assemblies are arranged on the cyclic sodium reaction kettle and connected with the corresponding liquid storage tanks respectively, and the installation frame is fixedly installed at the top of the cyclic sodium reaction kettle. The hollow shaft is rotatably mounted on the sodium annulus reaction kettle, and the driving assembly is arranged on the mounting frame and is connected with the hollow shaft. The reaction kettle is reasonable in design, has the advantages of compact structure, good stirring effect, accurate dropwise adding, accurate reaction endpoint judgment, convenience in operation and the like, and has higher practical value and application prospect.

The application discloses a method for preparing methyl nadic anhydride by using carbon nine and carbon ten fraction, high-purity methyl cyclopentadiene obtained by cracking and separation of the carbon nine and carbon ten fraction; the methyl cyclopentadiene is used as raw material and is added dropwise into a synthesis reactor, and is subjected to a synthesis reaction with maleic anhydride dissolved and dispersed in a solvent in the synthesis reactor under nitrogen protection and stirring at 10-60 DEG C; the reaction product enters a light component recovery tower, unreacted methyl cyclopentadiene, solvent and methyl cyclopentadiene dimer are removed from the top of the tower, crude methyl nadic anhydride is collected from a side line and enters an isomerization reactor for isomerization reaction; the isomerization reaction product enters an MNA post-treatment device, and is subjected to vacuum distillation / rectification to obtain a methyl nadic anhydride product.

The invention provides metallocene polyethylene resin and a preparation method thereof. The preparation method comprises the following steps: mixing ethylene, hydrogen and a comonomer, and carrying out copolymerization reaction under the protection atmosphere under the catalysis of a metallocene catalyst to obtain metallocene polyethylene resin, wherein the volume ratio of the ethylene to the comonomer is (40-55): (0.5-2); wherein the metallocene catalyst comprises a silica gel carrier and a metallocene compound, the silica gel carrier accounts for 70-90% by mass of the metallocene catalyst, and the metallocene compound accounts for 3-4.5% by mass of the metallocene catalyst; the metallocene compound comprises bis (1-butyl-3-methyl cyclopentadienyl) zirconium dichloride and / or bis (n-butyl cyclopentadienyl) zirconium dichloride. The metallocene polyethylene resin provided by the invention has good mechanical properties during film processing, and the film has few crystal points, so that the metallocene polyethylene resin is beneficial to application in the field of packaging.

An improved octane number combination is provided that includes methylcyclopentadienyl manganese tricarbonyl (MMT), an antioxidant having small steric hindrance, and a fluid carrier comprising an aliphatic fluid as the remainder of the composition. Also provided is a method of increasing octane number comprising introducing the octane number increasing composition of the invention into a fuel supply such that the octane number increasing composition of the invention has sufficient time to mix into the fuel supply to increase octane number and increase combustion efficiency, and using the fuel supply.

This application relates to a method for preparing carbamate compounds from dioxazolone derivatives, comprising the following steps: reacting a dioxazolone derivative with a hydroxyl-containing compound in the presence of a catalyst to prepare the carbamate compound. The catalyst includes one or more of dichlorobis(4-methylisopropylphenyl)ruthenium(II), tri(acetylacetonate)ruthenium(III), cyclooctadiene ruthenium(II) chloride, and dichloro(pentamethylcyclopentadienyl)iridium(III) dimers. This synthetic method is universally applicable to the synthesis of carbamate compounds with different group types (such as alkyl, aryl, heteroaryl, etc.), and exhibits high yields and mild reaction conditions.