283 results about "Methyl iodide" patented technology

The present invention relates to the technical field of nanofiltration membranes, and particularly relates to a preparation method for a positively charged nanofiltration membrane for improving a "trade-off" effect. The preparation method comprises the following process: sequentially adding a water phase and an oil phase to the surface of a support layer to perform a reaction, so as to prepare a polyamide layer; pouring in a functionalized graphene dispersion; and sequentially placing same into an N,N-dimethyl propane diamine solution, a sodium borohydride solution and an iodomethane solution to perform a reaction, so as to obtain a nanofiltration membrane, wherein the functionalized graphene is pyrrolidone-based graphene. According to the present invention, a mixture of piperazine and polyethyleneimine is used as a water phase and is subjected to interfacial polymerization with an oil phase 1,3,5-trimesoyl chloride on the surface of the support membrane; and by means of the compounding of micromolecular piperazine and macromolecular polyethyleneimine, the rapid formation of a polyamide layer is promoted, the distance of a system cross-linked network is increased, a positively charged polyamide layer having a large pore diameter and good hydrophilicity is formed, and a good water flux and a good rejection rate are achieved, thereby improving the "trade-off" effect.

The present disclosure provides an integrated process for producing trifluoroiodomethane (CF3I), in three steps: a) reacting a first reactant stream comprising hydrogen (H2) and iodine (I2) in the presence of a first catalyst to produce a first product stream comprising hydrogen iodide (HI); (b) reacting the first product stream with a second reactant stream comprising trifluoroacetyl chloride (TFAC) in the presence of a second catalyst to produce an intermediate product stream comprising trifluoroacetyl iodide (TFAI); and (c) reacting the intermediate product stream to produce a final product stream comprising trifluoroiodomethane. (CF3I).

The invention provides a triphenylamine derivative as well as a preparation method and application thereof in killing gram-positive bacteria. The preparation method comprises the following steps: firstly, synthesizing an intermediate molecule 4-di-p-methoxyanilino benzaldehyde (s); the s respectively reacts with 3-pyridylacetonitrile and 4-pyridylacetonitrile to generate intermediate molecules a and b; the intermediate molecules a and b respectively react with methyl iodide to generate triphenylamine derivatives 1 and 2, and the intermediate molecules a and b respectively react with 9-bromomethyl anthracene to generate triphenylamine derivatives 3 and 4. The prepared triphenylamine derivative has a donor-acceptor structure and is a D-pi-A structure, the modified triphenylamine is used as a donor, a carbon-carbon double bond is used as a covalent bridge, and cyano and N positive ions have electron withdrawing property. As all the components contain positive ions, the components can be anchored on a bacterial membrane to kill bacteria; and the compound has a short alkyl chain and can be combined with gram-positive bacteria, so that the bacteria are killed.

The invention relates to an antistatic plastic film and a preparation method thereof, and belongs to the technical field of polymeric membrane materials, the antistatic plastic film is composed of a PET base film and an antistatic coating formed by curing an antistatic coating, the antistatic coating comprises the following components in parts by weight: 100 parts of organic silicon resin, 12-18 parts of an antistatic agent, 0.8-1.1 parts of a dispersing agent, 0.4-0.6 part of a bridging agent, 0.15-0.2 part of a flatting agent and 55-60 parts of a solvent, according to the antistatic agent, lamellar graphene is used as an electrostatic charge release matrix, a silane coupling agent KH-550 is used for introducing amino to the surface of a lamellar layer for modification, methyl chloroacetate and the amino grafted to the lamellar layer are used for substitution, finally, methyl iodide and a substituted amine compound are subjected to quaternization reaction, quaternary ammonium cations are introduced to the surface of the graphene lamellar layer, and the antistatic agent is obtained. And a continuous current collecting layer is formed in the coating, so that the generated electrostatic charge is timely led out, and the film material is endowed with excellent antistatic property.

The invention discloses a mechanical force-induced fluorescence discoloration sensor material as well as a preparation method and application thereof, and relates to the technical field of organic synthesis and fine chemical engineering. The preparation method comprises the following steps: step 1, carrying out heating reaction on 4-(1, 2, 2-triphenyl vinyl) benzaldehyde, 3-(2, 2-dicyano-1-(3, 4-diaminophenyl) vinyl) benzene-1-yl and a catalyst to prepare a compound 1-1; and 2, carrying out heating reaction on the obtained compound 1-1 and methyl iodide under the action of alkali and a solvent, and analyzing and purifying to obtain a compound 1-2. The compound disclosed by the invention is low in preparation cost, simple and convenient to operate and simple in method, the compound shows the material characteristic of mechanical force-induced fluorescence discoloration and can be applied to the fields of sensors, dyes, anti-counterfeiting and the like, and meanwhile, the synthesis method can be used for synthesis in the fields of fine organic chemical engineering such as luminescent materials, printing and dyeing technologies and the like.

The invention provides a fluorescent probe for detecting hydroxyl radicals as well as a preparation method and application thereof, and the preparation method comprises the following steps: (S10) synthesizing a first intermediate compound by taking 2, 3, 3-trimethyl-3H-indoline and methyl iodide as raw materials; (S20) synthesizing a second intermediate compound by taking phosphorus trichloride, cyclohexanone and anhydrous dimethylformamide as raw materials; (S30) mixing and reacting the first intermediate compound and the second intermediate compound to synthesize a compound IR780; and (S40) synthesizing OH-probe on the basis of the IR780. The prepared OH-probe has extremely high sensitivity and excellent selectivity on hydroxyl radicals, can be effectively used for monitoring and mapping the level of the hydroxyl radicals, and can be applied to detection of atherosclerosis, obesity, cancers, neurodegenerative diseases, inflammatory diseases and other free radical related diseases. Wide development prospects and practical application values are realized.

The invention discloses a catalyst system for methanol low-pressure carbonyl synthesis of acetic acid, and relates to the technical field of methanol low-pressure carbonyl synthesis of acetic acid, the catalyst system comprises a group VIII metal main catalyst, an iodomethane cocatalyst, an inorganic iodide, and an ionic liquid with [NR1R2R3R4] < + > [CH3COO] <-> as a catalyst stabilizer, r1, R2, R3 and R4 in the ionic liquid are alkyl, aryl and acyl containing 4-9 carbons or a combination thereof, and when the catalyst system is applied to a process for synthesizing acetic acid by methanol low-pressure carbonyl, a metal catalyst can be kept stable under the condition of low water content, so that the separation energy consumption of a subsequent rectification system is reduced.

The invention relates to the technical field of organic iodine detection, in particular to application of a COF material in iodomethane fluorescence detection. The structure of the COF material is as follows: # imgabs0 #. The COF material with a specific structure is applied to iodomethane fluorescence detection, the COF material is low in cost, easy to obtain and good in thermal stability and acid-base stability, the use limitation under many harsh conditions is avoided, and the iodomethane fluorescence detection method is simple and rapid.

The invention discloses a method with high catalyst stability for low-pressure carbonyl synthesis of acetic acid from methanol, and relates to the technical field of low-pressure carbonyl synthesis of acetic acid from methanol, and the method comprises the following steps: S1, reaction section: introducing methanol or a reactive derivative thereof and CO into a reactor, adding a group VIII metal catalyst, an iodomethane cocatalyst and inorganic iodide, and carrying out a reaction for 2-4 hours; the preparation method comprises the following steps: by taking a raw material as a raw material and an ionic liquid with a [NR1R2R3R4] < + > [CH3COO] <-> structure as a catalyst stabilizer, carrying out carbonyl synthesis reaction on the material in a reactor to obtain an acetic acid crude product, and in the formula, R1, R2, R3 and R4 are alkyl, aryl and acyl containing 4-9 carbons or a combination thereof; s2, carrying out gas-liquid separation; s3, evaporating and washing; s4, light component removal treatment; and S5, purification treatment, so that the VIII group metal catalyst can still keep stable when reactants are in a reaction system with low water content of 0.5-1.0%, the energy consumption of a rear-end dehydrating tower and a finished product tower is reduced, and the production cost is reduced.

The invention discloses a preparation method and application of a metal sulfide adsorbent for adsorbing iodine and methyl iodide. The preparation method comprises the following steps: uniformly mixing an antimony source, a sulfur source, a deep eutectic solvent, polyamine and water to obtain a mixed solution; and transferring the mixed solution into a high-pressure reaction kettle, sealing, carrying out hydrothermal reaction at 110-220 DEG C for 2-9 days, cooling to room temperature to separate out crystals, and filtering, washing and drying to obtain the metal sulfide adsorbent. The invention also discloses application of the metal sulfide adsorbent in adsorption of iodine and methyl iodide. The metal sulfide adsorbent disclosed by the invention has a good adsorption effect on iodine and methyl iodide, and compared with an ethylenediamine-oriented metal sulfide adsorbent, the diethylenetriamine-oriented metal sulfide adsorbent has higher adsorption capacity on iodine and methyl iodide.

The invention discloses a method for synthesizing loxoprofen sodium by using a resin catalyst, and belongs to the field of medical chemical synthesis. The preparation method comprises the following steps: synthesizing 2-methylene cyclopentanone through methylenation reaction of cyclopentanone, paraformaldehyde and amine; the preparation method comprises the following steps: reacting 4-halogenated phenylacetate with methyl iodide to synthesize 2-(4-halogenated phenyl) propionate; a target intermediate 2-(4-((5-oxocyclopentyl-1-alkenyl) methyl) phenyl) propionate is generated through a Heck coupling reaction; further reducing to 2-(4-((2-oxygen cyclopentyl) methyl) phenyl) propionate through a catalytic hydrogenation reaction; and finally, carrying out a salt forming reaction to obtain loxoprofen sodium. The method adopts the self-made resin catalyst, is efficient and environment-friendly, has good yield and purity, and is suitable for industrial production.

The invention provides a preparation method of 6-benzofuran phenol, which comprises the following steps: step S1, 6-hydroxy-2H-benzofuran-3-ketone and a methylation reagent are subjected to a reaction to generate 6-hydroxymethyl-2H-benzofuran-3-ketone, and the methylation reagent is one or more of dimethyl sulfate, methyl iodide, dimethyl carbonate and the like; step S2, enabling the 6-hydroxymethyl-2H-benzofuran-3-ketone to react with a reducing agent, so as to generate 6-hydroxymethyl-2H-benzofuran-3-alcohol; s3, the 6-hydroxymethyl-2H-benzofuran-3-alcohol is subjected to a demethylation reaction and an elimination reaction, and the 6-benzofuran phenol is generated. According to the preparation method of the 6-benzofuran phenol, the phenolic hydroxyl group is protected by methyl, demethylation and alcohol elimination are completed by a one-pot method, and an intermediate product has few impurities and is simple to purify.

The invention discloses a preparation method of methylboronic acid-d3, which comprises the following steps: taking iodomethane-d3 as a raw material, carrying out Grignard reaction on the iodomethane-d3 and magnesium chips to generate methyl magnesium iodine-d3, further reacting the methyl magnesium iodine-d3 and trimethyl borate to generate dimethyl methylboronic acid, adding acid, quenching, hydrolyzing, and purifying to obtain the methylboronic acid-d3. The product prepared by the method is high in purity, high in yield and high in deuteration degree.

The invention discloses a high-barrier packaging material and a preparation method thereof, and relates to the technical field of packaging materials. When the high-barrier packaging material is prepared, 5, 12-tetrabenzoquinone and tetrabromomethane react to prepare an intermediate; reacting the intermediate with 4-(benzyl acrylate) phenylboronic acid to obtain a stilbene-based cross-linking agent; the preparation method comprises the following steps: carrying out a reaction on polyethylene glycol terephthalate, 3-amino propylene and allyl tri (trimethylsiloxy) silane to prepare functional polyester; reacting the pre-modified nano mica sheet with methyl iodide to obtain a modified nano mica sheet; the preparation method comprises the following steps: uniformly mixing functional polyester, a stilbene-based cross-linking agent, a modified nano mica sheet and 7-methyl-1, 5, 7-triazabicyclo [4.4. 0] dec-5-ene, and carrying out blow molding to obtain the high-barrier packaging material. The high-barrier packaging material prepared by the invention has excellent flame-retardant, antibacterial, anti-aging and high-barrier properties.

The invention relates to the technical field of covalent organic framework functional materials, in particular to a pyridine-rich imine type covalent organic framework as well as a preparation method and application thereof. The pyridine-rich imine type covalent organic framework disclosed by the invention has a structure as shown in the following formula (I): # imgabs0 # formula (I). The pyridine-enriched imine type covalent organic framework disclosed by the invention contains rich pyridine-N active sites, can efficiently adsorb iodine through Lewis acid-base action, and can effectively fix iodomethane through methylation reaction, so that two iodine pollutants can be efficiently captured at the same time. The pyridine-rich imine type covalent organic framework disclosed by the invention also has good crystallinity, larger specific surface area and excellent thermal stability and acid-base stability, and can realize efficient adsorption of iodine and iodomethane.

The invention relates to the technical field of preparation of small molecule compound medicines, in particular to a preparation method of (S)-flurbiprofen. The method comprises the following steps: dropwise adding a tetrahydrofuran solution of 4-bromo-2-fluorobiphenyl into a mixture of tetrahydrofuran and magnesium, and reacting to generate a Grignard reagent; mixing tetrahydrofuran, (S)-vinyl chloride oxide and ferric acetylacetonate, dropwise adding the Grignard reagent, performing acidolysis ring opening, and performing methylation with methyl iodide and magnesium iodide to obtain an alpha-hydroxyl aromatic carboxylic acid derivative; and reacting with sodium chlorite, nitroxide free radicals and acetonitrile, and oxidizing to obtain the (S)-flurbiprofen. By introducing a chiral induction unit, effective transmission of chiral information is realized in a coupling stage, an original chiral center is not destroyed in a subsequent reaction, and a product is ensured to have a highly consistent configuration. According to the scheme, the technical problem that a method capable of remarkably improving the optical purity and yield of (S)-flurbiprofen is lacked in the prior art can be solved, and the method has good environmental friendliness and industrial application prospects.

The invention discloses an adsorption material for high-humidity and high-temperature iodine-containing aerosol and a preparation method thereof.According to the prepared adsorption material, polymers such as melamino-formaldehyde resin serve as a three-dimensional porous framework, and the adsorption material is prepared through a mild one-step solution processing method; an ionic polyimine network based on a lysine salt ionic liquid and carbonyl-rich polyvinylpyrrolidone are compounded on a skeleton in situ to form a porous adsorbent, and the porous adsorbent realizes efficient capture of elemental iodine (I2), methyl iodide (CH3I) and iodine aerosol through a synergistic mechanism of electrostatic induced adsorption and in-situ packaging and curing, so that the adsorption efficiency is improved, and the adsorption efficiency is improved. Under the harsh industrial conditions that the temperature is 100 DEG C or above and the relative humidity is 90% or above, the dynamic adsorption capacity to iodine reaches up to 160.7 wt%, the filtering efficiency is kept 99.8% or above, meanwhile, excellent iodine retention stability, recoverability and large-scale preparation potential are achieved, and an efficient, low-cost and practical solution is provided for treatment of radioactive iodine in nuclear waste gas.

The present application relates to a kind of preparation method of trifluoromethyl pyrazole compound, belong to the technical field of organic synthesis.The specific method is: (1) trifluoroacetyl ethyl acetate is first with hydrazine hydrate cyclization reaction and generates compound of formula III;(2) under the catalysis of base, compound of formula III is reacted with difluoromethylation reagent and generates compound of formula II;(3) compound of formula II is reacted with methylating agent and obtains compound of formula I;The difluoromethylation reagent is difluoro-monochloromethane or sodium difluoro-monochloroacetate;The methylating agent is chloromethane, bromomethane, iodomethane, dimethyl sulfate or dimethyl carbonate.The present application is prepared by changing reaction route, and the higher-priced raw material methylhydrazine is replaced, and isomer impurity is no longer generated in the product prepared.Not only raw material cost is reduced, but also the purity of product is improved.

To provide a mixed refrigerant composition with improved environmental friendliness, and a heat pump which includes the mixed refrigerant composition.SOLUTION: A mixed refrigerant composition according to exemplary embodiments includes carbon dioxide (R-744), 2,3,3,3-tetrafluoropropene (R-1234yf) and trifluoroiodomethane (R-13I1). A content of the carbon dioxide (R-744) may be 1 to 10 wt.% based on a total weight of the mixed refrigerant composition, and a sum of a content of the 2,3,3,3-tetrafluoropropene (R-1234yf) and a content of the trifluoroiodomethane (R-13I1) may be 90 to 99 wt.% based on the total weight of the mixed refrigerant composition. A boiling point at 1 atm of the mixed refrigerant composition may be -76 to -35°C.SELECTED DRAWING: Figure 1

The present invention discloses a multifunctional ionic porous organic cage material, its preparation method and chromium adsorption application, belonging to the technical field of porous organic materials. In the present invention, a porous organic cage material NKPOC-PH is synthesized using tetraaldehyde m-cyclocucurbit[4]arene and pyridine-3,5-dicarboxylic dihydrazide as reaction monomers, and then it is modified with methyl iodide to obtain ionic NKPOC-PH(I)Me. The present invention uses an easily modified porous organic cage as the substrate to construct triple synergistic adsorption sites of redox, coordination and electrostatics. Pyridine groups in the material are used as the introduction points of electrostatic sites, hydrazide linking groups as redox sites, and nitrogen-rich sites to adsorb dichromate ions through coordination. The obtained ionic porous cage can achieve an ultra-high chromium adsorption performance with a saturated adsorption capacity exceeding 1.3 g / g under acidic (pH = 3-4) aqueous phase conditions. The ionic porous organic cage material described in the present invention provides a new solution for adsorbing dichromate ions under aqueous phase conditions.

The invention belongs to the field of chemical reagent moisture detection, and particularly relates to a coulometry Karl Fischer reagent for aldehyde ketone moisture detection and a preparation method of the coulometry Karl Fischer reagent. The coulometry Karl Fischer reagent for aldehyde ketone moisture detection is prepared from the following components in parts by weight: 1 to 15 percent of imidazole, 1 to 15 percent of 2-methylimidazole, 25 to 70 percent of ethylene glycol monomethyl ether, 5 to 30 percent of trichloromethane, 2 to 30 percent of trifluoroethanol, 2 to 10 percent of sulfur dioxide, 1 to 10 percent of methyl iodide, 0.1 to 5 percent of tetrabutylammonium iodide and 0.1 to 5 percent of iodine. The method does not contain hydroxyl compounds, effectively inhibits the generation of side reactions in detection, ensures the detection accuracy, and improves the product stability and effectively shortens the instrument equilibrium time by adding iodomethane and tetrabutylammonium iodide.

This invention relates to a 1,1,2,2-tetrahydroperfluoroalkyl-substituted allyl quaternary ammonium salt, its preparation method, and its application, belonging to the field of flocculation treatment technology for high-salt industrial wastewater from natural gas purification. To address the problem that the synthesis of cationic polymer flocculants in existing technologies requires large amounts of surfactants and involves complex operations, this application employs a substitution reaction between 1,1,2,2-tetrahydroperfluoroalkyl iodide and N-methylallylamine; iodomethane is then reacted with the substitution reaction product to undergo quaternization, yielding a 1,1,2,2-tetrahydroperfluoroalkyl-substituted allyl quaternary ammonium salt; the 1,1,2,2-tetrahydroperfluoroalkyl-substituted allyl quaternary ammonium salt is polymerized with acrylamide to obtain a novel cationic polyacrylamide flocculant. The synthesis of cationic fluorocarbon-modified hydrophobic associative polyacrylamide flocculants using an aqueous solution polymerization method is simple, requires no surfactants, and experiments show that the prepared flocculant exhibits excellent flocculation performance.

The application discloses a kind of perovskite ink based on 3D printing and its preparation method and application, comprising, ammonium salt and lead iodide are dissolved in mixed organic solvent, after stirring, perovskite precursor liquid is obtained;Additive is added to perovskite precursor liquid, and perovskite ink is obtained after heating and stirring;Wherein, the ammonium salt includes one or two of methyl iodide ammonium and phenethyl amine iodide.This application further improves the crystallization quality and environmental stability of perovskite material by synergistically utilizing the defect passivation and in-situ encapsulation effect of PVP (polyvinylpyrrolidone), so that the obtained perovskite ink can be innovatively applied to 3D printing technology for the first time to prepare a perovskite direct X-ray detector, solves the practical situation that the viscosity of traditional perovskite solution is low and difficult to 3D print, and provides a new material preparation technology for the development of high-sensitivity, high-resolution perovskite direct X-ray imaging detector.

The invention provides an electroplating solution containing a novel additive and application of the electroplating solution in copper electroplating. The pyridine-2-acetaldehyde oxime methyl iodide is used as a novel copper electroplating additive (leveling agent) for the copper electroplating process, the cost is low, safety and no pollution are achieved, and the novel additive stably exists in the electroplating liquid. The novel additive is applied to the electrocoppering process, compact filling from bottom to top can be achieved, the surface of a plating layer is bright and flat, different adsorption behaviors of the additive can be regulated and controlled by regulating and controlling distribution of current density at interfaces of the inner surface and the outer surface of a micropore, and therefore the additive can be widely applied to high-density interconnection of electronic devices and can be applied to electrocoppering. And high-quality and high-stability signal transmission is satisfied.

The invention provides a synthesis method of N-substituted tropinone derivatives, and relates to the technical field of organic synthesis. The method provided by the invention comprises the step of reacting a tropinone compound with a fatty amine derivative in a solvent environment under the action of an acid accelerator to generate the N-substituted tropinone derivative in one step. Compared with a method that tropinone and a highly toxic reagent methyl iodide firstly react to generate a quaternary ammonium salt intermediate and then the quaternary ammonium salt intermediate and a fatty amine derivative are subjected to two-step synthesis under the action of alkali, the method is greener and more efficient, meanwhile, the used raw materials are cheap and easy to obtain, and the method is suitable for industrial production. The method has mild reaction conditions, is more suitable for large-scale production, has potential industrial value and has a wide application prospect.

The invention discloses a preparation method of a difluoromethyl reagent and application of the difluoromethyl reagent in synthesis of a nickel-catalyzed alkyl difluoromethyl compound. The preparation method of the difluoromethyl reagent comprises the following steps: in an inert gas atmosphere, adding potassium iodide, cuprous iodide and a water-containing dimethylformamide solution into a reaction container, heating, dropwise adding difluorochloroacetic acid of DMF (Dimethyl Formamide) into a reaction system, collecting difluoroiodomethane, and supplementing a 1-methyl-2-pyrrolidone NMP (N-Methyl Pyrrolidone) solution into the system. The invention provides a difluoromethyl reagent which is simple and convenient to operate, low in cost, high in yield, environment-friendly and beneficial to large-scale preparation and application of the reagent in synthesis of difluoromethyl substituted alkane compounds.

The present invention provides a composition comprising carbon dioxide (C02, R-744), difluoromethane (R-32) and trifluoroiodomethane (CF3I) and the use of such a composition as a working fluid in a heat transfer system, such as a refrigeration, heat pump or air conditioning system.

The invention belongs to the technical field of chemical synthesis of spices, and particularly relates to a synthetic method of vanillin and ethyl vanillin. Carrying out substitution reaction on catechol and methyl iodide to generate o-dimethoxybenzene 3; 3 and 1, 2-dichloromethyl methyl ether are subjected to formylation reaction to generate 3, 4-dimethoxybenzaldehyde 4; carrying out demethylation reaction on the 3, 4-dihydroxy benzaldehyde 5 and pyridine hydrochloride to generate 3, 4-dihydroxy benzaldehyde 5; carrying out substitution reaction on the 4-benzyloxy-3-hydroxybenzaldehyde 5 and benzyl bromide to generate 4-benzyloxy-3-hydroxybenzaldehyde 6; carrying out substitution reaction on the 4-benzyloxy-3-methoxyl / ethyoxyl benzaldehyde 6 and iodomethane / iodoethane to generate 4-benzyloxy-3-methoxyl / ethyoxyl benzaldehyde 7; 7 is reduced by hydrogen under the catalysis of palladium on carbon to generate vanillin / ethyl vanillin. Cheap catechol is adopted as a raw material, reaction conditions are mild, equipment requirements are not high, energy consumption is low, the problems that raw materials are not suitable to obtain, the price is high, separation is difficult, and three wastes are seriously generated in a traditional vanillin synthesis method are solved, and a new method is provided for synthesis of vanillin.

This invention relates to the field of perovskite solar cell technology, and discloses a method for preparing a low-dimensional perovskite thin film and its solar cell. The method for preparing the low-dimensional perovskite thin film is as follows: Step 1, weighing p-fluorophenylethylamine iodine, methyl iodide, lead iodide, formamidine iodide, methyl ammonium chloride, and lead chloride, and dispersing them in a mixed solution composed of dimethylformamide and dimethyl sulfoxide to obtain a low-dimensional perovskite precursor solution; Step 2, dropping the low-dimensional perovskite precursor solution onto a substrate, rapidly spin-coating for 10-20 seconds, and then subjecting it to reverse-order cooling annealing to obtain a low-dimensional perovskite thin film. This invention rapidly forms a low-dimensional perovskite wet film through high-speed spin-coating, followed by reverse-order cooling annealing, which not only enables the preparation of low-dimensional perovskite thin films with vertically grown multiphase structures, but also has good repeatability and reduces the manufacturing cost of battery devices. The reverse-order cooling annealing process described in this invention is simple and suitable for industrial production.

The invention belongs to the technical field of pharmaceutical chemistry, and particularly relates to a method for preparing a sodium sugammadex intermediate compound. The invention uses compound II as a raw material to generate compound I under the action of triphenyl phosphite iodomethane; the process uses triphenyl phosphite iodomethane as an iodine reagent to carry out the reaction, which can effectively avoid the ring-opening degradation of raw material γ-cyclodextrin and product fully iodinated γ-cyclodextrin caused by HI generated during the reaction of single iodine, and the reaction is more mild, economical and environmentally friendly, and has a high yield, and is suitable for industrial production.