160 results about "Trimethylsilyl" patented technology

Described herein are lithium-metal rechargeable electrochemical cells comprising a lithium-metal negative electrode, a positive electrode, and a liquid electrolyte. The liquid electrolyte comprises a core mixture and a diluent. The diluent comprises a fluorinated ether. The core mixture comprises a set of salts and a set of solvents. The set of solvents comprises a pyrrolidinium-containing ionic liquid and a molecular solvent. The molecular solvent is a non-fluorinated ether, for example including but not limited to 1,2-dimethoxyethane. In some examples, the electrolyte further comprises an electrolyte additive, for example including but not limited to tris(trimethylsilyl)phosphate. In some examples, the set of salts comprises one or more imide-containing lithium salts. In some examples, the set of salts comprises lithium bis(fluorosulfonyl)imide and an additional salt and the mole fraction of lithium bis(fluorosulfonyl)imide in the set of salts is 0.5 or greater.

The invention provides a low-temperature sodium-ion battery containing a modified negative electrode as well as a preparation method and application of the low-temperature sodium-ion battery. The low-temperature sodium-ion battery comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises negative electrode slurry, and the negative electrode slurry comprises an active substance, conductive carbon, sodium carboxymethyl cellulose and butadiene styrene rubber; the active substance comprises modified hard carbon; the modified hard carbon is prepared by oscillating and mixing hard carbon with a single-walled carbon nanotube, graphite carbon and soft carbon to obtain physical coating, further oscillating and mixing with the doped modified precursor powder, and calcining at high temperature to complete element doping and chemical coating; and the electrolyte comprises an additive selected from trimethylsilyl nicotinate, methyl 4-hydroxy-3-methoxycinnamate and the like. On one hand, the adhesive force of the negative electrode slurry on the current collector is improved, on the other hand, the solvent formula is optimized, the desolvation ability of sodium ions in the electrolyte is improved, the viscosity is reduced, and the additive is added to modify an electrode surface interface film, so that the charge-discharge performance of the battery at low temperature is improved.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of isoindolone. An N-methylbenzylamine compound as shown in a formula 1 and a 2-fluorobenzoic acid methyl ester compound as shown in a formula 2 are mixed with methyl tert-butyl ether in the presence of bis (trimethylsilyl) lithium amide and cesium fluoride, and the isoindolone as shown in a formula 3 is synthesized through reaction. The isoindolone derivative is synthesized through a one-pot method, and the method has the prominent advantages that raw materials are simple and easy to obtain, operation is easy and convenient, economy and environment friendliness are achieved, and the substrate applicability is wide.

The invention discloses a preparation method of an SGLT2 inhibitor key intermediate, and belongs to the technical field of medicinal chemistry. The preparation method comprises the following steps: 1) reacting a compound B with trimethylchlorosilane under an alkaline condition to generate a compound C; 2) reacting the compound C with an aldehyde group reagent on an aromatic ring to generate a compound D; 3) reacting the compound E with a bromination reagent to generate a compound F; 4) preparing the compound F into a Grignard reagent to generate a compound G; 5) carrying out addition reaction on the compound D and a compound G to generate a compound H; and 6) carrying out dehydroxylation and trimethylsilyl protection on the compound H to generate a compound A. According to the preparation method, the risk caused by amplification of the Sandmeyer reaction in the original route is avoided, and meanwhile, the preparation cost of the key intermediate is greatly reduced.

The application discloses a kind of flame-retardant mildew-proof prepolymer, transparent flame-retardant mildew-proof silicone sealant and preparation method thereof.The flame-retardant mildew-proof prepolymer is prepared from raw materials including the following components by weight: mildew-proof agent 0.5-10 parts, flame retardant 20-50 parts, tackifier composition 0.2-2 parts;The tackifier composition is composed of alkyl acetoacetate, trimethylsilyl ethyl acetate, 3-isocyanate propyl trimethoxysilane and polyether silicone oil.The transparent flame-retardant mildew-proof silicone sealant is prepared from raw materials including the following components: alkyl alkoxy-terminated polydimethylsiloxane, white carbon black, the flame-retardant mildew-proof prepolymer, crosslinking agent, catalyst, coupling agent.The transparent flame-retardant mildew-proof silicone sealant prepared by the application not only has very high transparency, but also has excellent flame-retardant effect, long-lasting mildew-resistant and antibacterial properties, and good bonding stability and mechanical strength.

The invention relates to a method for detecting primary metabolites and / or secondary metabolites in flavors and fragrances, which comprises the following steps: (1) mixing flavors and fragrances, an internal standard substance and a solvent, extracting, taking clear liquid, and removing the solvent to obtain a dry product; (2) mixing the dry product, an oximation reagent and a solvent for an oximation reaction, and then mixing a reaction system and a silanization reagent for a silanization reaction to obtain a solution to be detected; the silanization reagent comprises a combination of N-methyl-N-(trimethylsilyl) trifluoroacetamide and N, O-bis (trimethylsilyl) trifluoroacetamide, and the silanization reagent comprises N-methyl-N-(trimethylsilyl) trifluoroacetamide and N, O-bis (trimethylsilyl) trifluoroacetamide; and (3) detecting the solution to be detected by adopting a gas chromatography-mass spectrometry method, and obtaining the content of primary metabolites and / or secondary metabolites in the flavors and fragrances by utilizing an internal standard method. According to the method provided by the invention, the flavors and fragrances are subjected to oximation and silanization treatment, and then the flavors and fragrances are detected by using the gas chromatography-mass spectrometry, so that the metabolites contained in the flavors and fragrances can be precisely and accurately detected.

The application belongs to the field of organic synthesis, and discloses a method for preparing chiral 2-(1,3-diarylallyl)malonate by using a Pd / phosphine oxygen bidentate phosphine phenol ligand catalysis, which comprises the following steps: under a protective atmosphere, mixing P, O-bidentate phosphine phenol ligand, a palladium catalyst, N, O-bis(trimethylsilyl)acetamide, a malonate nucleophilic reagent and an allyl acetate electrophilic reagent in dichloromethane, and reacting to obtain chiral 2-(1,3-diarylallyl)malonate product. The system has the advantages of high enantioselectivity, high catalytic efficiency, wide substrate application range and mild conditions.

The invention discloses a preparation method and application of a silicon-based functionalized fluorenyl polysubstituted acetylene copolymer and a gas separation membrane thereof. Belongs to the technical field of polymer material and gas separation. The invention provides a new thought for preparation of a high-permeability gas separation membrane material. The preparation method comprises the following steps: carrying out copolymerization on 1-phenyl-2-(7-trimethylsilyl-9, 9-bis (trimethylsilyl-fluorene-2-yl) acetylene and 1-phenyl-2-(7-trimethylsilyl-9, 9-dimethyl-fluorene-2-yl) acetylene under the catalysis of TaCl5-n-Bu4Sn, so as to prepare a copolymer with high molecular weight; the preparation method comprises the following steps of: carrying out film casting on a solution of the nano-silver oxide, and then carrying out desiliconization treatment by using normal hexane / trifluoroacetic acid to obtain a gas separation membrane with the thickness of 100-220 microns, the specific surface area of 298-492 m / g and the total pore volume of 0.134-0.299 cm / g. The prepared separation membrane has the advantages that the COpermeability is up to 36,900 Barrer, the Opermeability is 19,800 Barrer, the thermal decomposition temperature exceeds 420 DEG C, the separation membrane can be used for separating gases such as COO, ON and the like, the preparation process is simple and convenient, and the industrial potential is realized.

Certain aspects of the present disclosure may include a battery including a cathode including a fluorinated carbon material and manganese oxide, an anode including one or more of a lithium metal or a lithium alloy, and a non-aqueous electrolyte including: an organic solvent, one or more lithium salts including lithium perchlorate, and an additive material having lithium nitrate and tris-trimethyl silyl phosphite.

The invention belongs to the technical field of organic synthesis, and particularly provides a preparation method of (trimethylsilyl) methylamine hydrochloride. The preparation method provided by the embodiment of the invention comprises the following steps: carrying out reduction reaction on N-[(trimethylsilyl) methyl] benzylamine, and salifying with hydrochloric acid to generate (trimethylsilyl) methylamine hydrochloride. According to the preparation method disclosed by the embodiment of the invention, milder reduction hydrogenation operation is selected, severe conditions such as high temperature and high pressure are avoided, and the reaction yield and the product purity are improved.

The invention discloses a new lithium battery material and a preparation method thereof, and relates to the technical field of lithium ion batteries, the new lithium battery material comprises an electrolyte, and the electrolyte comprises a solvent, a composite lithium salt and a functional additive; the solvent comprises fluoro-carbonate, ionic liquid and fluoro-ether; the composite lithium salt comprises lithium bis (fluorosulfonyl) imide (LiFSI), lithium bis (trifluoromethyl) sulfonyl imide (LiTFSI) and lithium bis (oxalato) borate (LiBOB); the functional additive comprises silane modified vinylene carbonate and tris (trimethylsilyl) phosphate. The composite lithium salt is matched with the functional additive and the solvent, so that the battery has relatively good discharge performance and cycle performance in a temperature range of-30 DEG C to 70 DEG C, and has good wide-temperature applicability.

This work investigates the beneficial roles of lithium bis(trimethylsilyl) phosphate (LiTMSP) which may act as a novel bifunctional additive for lithium ion batteries, in particular, LiNi0.5Mn1.5O4 (LNMO) / graphite cells. The cycle performance of LNMO / graphite cells is significantly improved with incorporation of LiTMSP. Trimethylsilyl functional group therein can react with HF generated through hydrolysis of LiPF6 by residual water in electrolyte solution, followed by a decrease in the concentration of metal ions dissolution from the electrode. The generation of superior passivating surface film derived by LiTMSP on graphite electrode, suppressing further electrolyte reductive decomposition and deterioration / reformation caused by migrated metal ions, is confirmed. Furthermore, LiTMSP derived surface film is likely to have better lithium ions conductivity with a decrease in resistance of the graphite electrode, improving rate performance of cells. The HF scavenging and film-forming effects of LTMPS are responsible for the less polarization of cells enabling to improve cycle performance.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of a 3-phenoxy substituted benzofuran compound. In an inert gas environment, a 2-fluorobenzyl phenyl ether compound as shown in a formula 1 and a methyl benzoate compound as shown in a formula 2 are mixed with an organic solvent tetrahydrofuran to react in the presence of bis (trimethylsilyl) caesium amino, and the 3-phenoxy substituted benzofuran compound as shown in a formula 3 is synthesized under a heating condition. According to the method, the raw materials which are easy to obtain are used, benzofuran is synthesized through a transition-metal-free method, and the method has potential application value in synthesis of active pharmaceutical ingredients.

The invention relates to the field of batteries, and particularly discloses a reversed-phase micro-micelle electrolyte system for an aqueous battery as well as a preparation method and application of the reversed-phase micro-micelle electrolyte system. The electrolyte system is composed of tris (trimethylsilane) phosphate, isopropanol, metal salt and water, and a reverse micelle structure with the average hydration size of 1-2 microns is formed through molecular self-assembly among the components. The unique structure limits water molecules in micelles and near an electrode interface, and cooperates with a firm SiO2-P2O5 inorganic interface layer generated on the surface of an electrode in situ to jointly inhibit side reactions such as decomposition of water, so that an electrochemical stability window of an electrolyte system at-20-60 DEG C is 5.0-6.0 V. When the composite material is applied to a water-based zinc ion battery, the super-long cycle life under high voltage and wide temperature range can be realized at the same time, and a new scheme is provided for developing a water-based energy storage device with high performance and high safety.

The application relates to the technical field of sodium ion batteries, in particular to an electrolyte for a sodium ion battery and a sodium ion battery thereof. The electrolyte comprises organic solvents, sodium salts and additives in percentage by weight. The additives comprise malonic acid compounds, nitrile compounds and tris(trimethylsilyl) phosphate. The additives of the electrolyte comprise macromolecular malonic acid compounds, which can effectively react with alkaline substances on the surface of a positive electrode material, form a film on the positive electrode, slow down or prevent the decomposition of the electrolyte solvent by the alkaline substances; meanwhile, the tris(trimethylsilyl) phosphate and the nitrile compounds in the electrolyte can effectively inhibit the oxidation reaction of Fe and Ni in the positive electrode and prevent the reduction of Fe and Ni in the negative electrode; the above-mentioned joint action can effectively improve the cycle life of the sodium ion battery.

This invention belongs to the field of organic synthesis, and specifically relates to a method for synthesizing 3-indolone. Using N-methylbenzylamine compounds of Formula 1 and methyl 2-fluorobenzoate compounds of Formula 2, in the presence of a strong base (lithium di(trimethylsilyl)amino) and a cesium salt additive (cesium fluoride), and mixed with an organic solvent (methyl tert-butyl ether), 3-indolone of Formula 3 is synthesized. The raw materials used in this invention are simple and readily available, and a one-pot method for synthesizing 3-indolone is constructed, which has advantages such as simple synthesis method, economic and environmental friendliness, and wide applicability.

The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to high-voltage electrolyte for a fast-charging lithium ion battery as well as a preparation method and application of the high-voltage electrolyte. Comprising the following substances: a main solvent, which comprises diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethylene carbonate (EC); the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE), and the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE); lithium hexafluorophosphate (LiPF6); the film-forming additive is LiDFOB lithium difluoro (oxalato) borate; a film forming additive tri (trimethylsilyl) phosphate TMSP; and lithium nitrate LiNO3. The method provided by the invention is simple and easy to implement and low in cost, and the obtained electrolyte shows excellent specific capacity, charge-discharge cycle stability and rate capability as an electrode material of a lithium ion battery and a sodium ion battery.

In order to solve the problems of internal resistance increase and heating of the existing lithium ion battery under the condition of high-rate charging and discharging, the invention provides a lithium ion battery which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, when the charging capacity of the positive electrode is set as P and the charging capacity of the negative electrode is set as N, N / P of the battery is 1.08-1.25; the non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, the additive comprises a first additive and a second additive, the first additive comprises at least one of tris (trimethylsilyl) phosphate, tris (triethylsilyl) phosphate, tris (trimethylsilyl) borate and tris (triethylsilyl) borate, and the second additive comprises at least one of tris (trimethylsilyl) phosphate, tris (triethylsilyl) borate and tris (triethylsilyl) borate. The lithium ion battery meets the following conditions: 0.001 < = (A1 + A2) / (T1 + T2) < = 0.013, 1.1 < = T2 / T1 < = 1.6, 0.1 < = A1 < = 1, 0.1 < = A2 < = 3, 60 < = T1 < = 170, and 80 < = T2 < = 200. The lithium ion battery has relatively low impedance, excellent fast charging performance and high-rate charging and discharging performance.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of a benzofuran compound. In an inert gas environment, a 2-fluorotoluene compound as shown in a formula 1 and a methyl benzoate compound as shown in a formula 2 are mixed and reacted with an organic solvent methyl tert-butyl ether in the presence of bis (trimethylsilyl) amino cesium and cesium sulfate, and the benzofuran compound as shown in a formula 3 is synthesized under a heating condition. Wherein the methyl benzoate compound as shown in the formula 2 can also be replaced by 2-naphthoic acid methyl ester or 1-naphthoic acid methyl ester. The research develops a benzofuran synthesis strategy without transition metal catalysis. According to the method, on the basis of commercially available raw materials, the construction of a benzofuran skeleton is realized through a simple and efficient path. Due to the mild and green reaction characteristic, a route with practical value is provided for synthesis of active medicine molecules and key intermediates of the active medicine molecules.

The invention discloses a copper-catalyzed aryl aldehyde ortho-position direct C-H etherification method, which comprises the following steps: by taking aryl aldehyde as a raw material, adding alcohol or phenol as shown in a formula (II), a copper catalyst, a guiding group, alkali and a solvent into a reactor, and reacting in an argon gas atmosphere to prepare an aryl ether compound as shown in a formula (III), a substituent group R1 is hydrogen, methyl, trifluoromethyl, methoxyl, phenyl, iodo, isopropyl, trimethylsilyl, dimethylamino, fluoro, chlorine, ester, tourmaline, naphthyl, isoquinolyl, benzothienyl or phenanthryl; a substituent group R2 is hydrogen, methyl, trifluoromethyl, methoxyl, phenyl, iodo, isopropyl, trimethylsilyl, dimethylamino, fluoro, chlorine, ester, tourmaline, naphthyl, isoquinolyl, benzothienyl or phenanthryl; and a substituent group R2 is methyl, 4-fluorophenyl, cyclobutane methyl, 4-tert-butyl phenyl, pentafluorophenyl, 4-cyanophenyl, 4-methyl ester phenyl, 3-nitrophenyl, adamantane methyl, cyclohexyl or an oestrone analogue. The copper catalyst and amino acid which are low in cost and easy to obtain are used as guiding groups, the operation process is simple and efficient, and the corresponding aryl ether compound can be obtained with the good yield.

An electrolyte, a battery cell, and a vehicle with a vehicle battery is provided. The electrolyte includes a ternary salt, dual-cyclic solvents, a linear carbonate solvent, and quaternary additives. The ternary salt includes lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide (LiFSI), and lithium difluoro(oxalate)borate (LiDFOB). The dual-cyclic solvents include ethylene carbonate (EC) between 0-30% by volume and fluoroethylene carbonate (FEC) between 0-30% by volume. The linear carbonate solvent includes at least one of ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), or diethyl carbonate (DEC). The linear carbonate solvent is between 60-80% by volume. The quaternary additives include vinylene carbonate (VC) between 0.5-2% by weight, trimethylsilyl (TMSi) between 0.25-1% by weight, bis(2,2,2-trifluoroethyl) carbonate (DFDEC) between 0.5-2% by weight, and succinic anhydride (SA) between 0.25-1% by weight.

The application relates to the field of biological medicine, and particularly relates to a method for identifying structures of drug carboxylic acid metabolites based on a derivatization reagent and high-resolution mass spectrometry. The method comprises the following steps: performing pretreatment on a biological sample (such as blood plasma, urine, feces and the like), precipitating proteins through an extraction solvent, and then centrifuging to collect supernatant; blowing nitrogen to dry the supernatant and redissolving; reacting with a derivatization reagent trimethylsilyl diazomethane at 30-60 DEG C for 1-60 minutes to make carboxylic acid metabolites generate methylation products; and identifying the carboxylic acid metabolites through molecular weight changes (+14 Da) by using high-resolution mass spectrometry. The method has high accuracy, is simple to operate, and is low in cost, is suitable for a variety of biological matrices and conventional small molecules, polypeptide and other carboxylic acid-containing metabolite structure identification, has important application value for early drug research and development and metabolism research, and can be widely applied to the fields of early drug research and development, drug metabolism research and the like.

Certain aspects of the present disclosure may include a battery including a cathode including a fluorinated carbon material and manganese oxide, an anode including one or more of a lithium metal or a lithium alloy, and a non-aqueous electrolyte including: an organic solvent, one or more lithium salts including lithium perchlorate, and an additive material having lithium nitrate and tris-trimethyl silyl phosphite.

The application provides a lithium ion electrolyte additive, a lithium ion electrolyte and a preparation method thereof, a lithium battery and an electrical equipment, and relates to the field of lithium batteries. The lithium ion electrolyte additive is 5-trifluoromethylpyridine-2-lithium trimethylborate. The preparation method comprises the following steps: mixing 2-hydroxy-5-trifluoromethylpyridine, lithium bis(trimethylsilyl)amide and a first organic solvent, and stirring and reacting to obtain 5-trifluoromethylpyridine-2-lithium hydroxide; and dropping trimethyl borate into a second organic solvent containing 5-trifluoromethylpyridine-2-lithium hydroxide, and reacting to obtain 5-trifluoromethylpyridine-2-lithium trimethylborate. The additive has a low oxidation potential, can form an effective CEI film before LNMO deintercalates lithium ions, thereby inhibiting the decomposition of the electrolyte in the subsequent reaction, reducing the generation of harmful substances HF, and further protecting the structure of the material.

The invention discloses a continuous synthesis method of 1-(2-chlorphenyl)-2-(2-tetrazolyl) ethanone, which comprises the following steps: (1) introducing a trimethylsilylated diazomethane solution and a strong alkali solution into a micro-channel reactor 1 for reaction, introducing the obtained intermediate reaction solution and a 2-chloromethyl benzoate solution into a micro-channel reactor 2 for continuous reaction, the preparation method comprises the following steps: adding 2-chlorophenyl to generate 1-(2-chlorophenyl)-2-(2-tetrazolyl-trimethylsilane) ethanone; and (2) removing a TMS group from the 1-(2-chlorphenyl)-2-(2-tetrazolyl-trimethylsilane) ethanone, and then carrying out post-treatment to obtain the 1-(2-chlorphenyl)-2-(2-tetrazolyl) ethanone. The continuous synthesis method uses a fluid process, has the advantages of small amplification effect, high production efficiency and environmental protection, improves the selectivity of 2-tetrazole, and avoids partial sensitization of intermediates.

The application relates to a pressure-resistant weather-resistant TPE floating cable foaming material and a preparation method thereof. 1. The TPE floating cable foaming material is obtained by the following raw materials and a closed foaming process; TPE 100 parts, hydrophobic filling material 17-28 parts, polystyrene derivative 26-42 parts, compatibility agent 2.5-5.5 parts, processing aid 1-5 parts and foaming agent 3.5-5 parts; the hydrophobic filling material is composed of cage polysilsesquioxane and octa-epoxy nano silicon dioxide dispersion and hydrophobic hollow glass microspheres; the polystyrene derivative is at least two of styrene-ethylene-butylene-styrene block copolymer, polystyrene and poly(septyl isobutyl cage polysilsesquioxane propyl methyl methacrylate), and polystyrene-poly(4-[N,N-bis trimethylsilyl]-aminomethyl); and the styrene-ethylene-butylene-styrene block copolymer is one of the polystyrene derivatives. The TPE floating cable foaming material has better physical properties, weather resistance and durability.

The application discloses a kind of active polymerization cyclic palladium catalyst and its preparation method and application, its structure general formula is as follows: in the formula, R is -OCH3, n=1 or 2 or 3.The preparation method synthesis step is as follows: adding 2-bromo-5-methoxybenzoic acid and pentafluorophenol, and solid product a is obtained by reaction;Add solid product a, CuCl and reagent B, trimethylsilyl acetylene, and solid product b is obtained by reaction;Solid product b and reagent C, 4-dimethylaminopyridine are added, and solid product c is obtained by reaction;Add solid product c, fluorinated tetrabutylammonium, and solid product d is obtained by reaction;Solid product d, CuCl and reagent D are added, and active polymerization cyclic palladium catalyst e is obtained by reaction.The palladium cyclic catalyst of the application can realize a small amount of catalyst catalyzing macro-reaction, and can realize controllable active polymerization, realize the accurate synthesis of polymer, and the polymerization yield is high.

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.

This invention provides a method for preparing dipeptide-2, the specific steps of which include amino protection of L-valine with 2-(trimethylsilyl)ethoxycarbonyl, condensation reaction of the product with L-tryptophan benzyl ester, deprotection to remove 2-(trimethylsilyl)ethoxycarbonyl, removal of benzyl group under palladium on carbon hydrogenation, and purification. This method belongs to the field of organic synthesis technology. This invention uses 2-(trimethylsilyl)ethoxycarbonyl as the amino acid protecting group, which can precisely and specifically protect the amino group, simplifying the operation steps for amino acid protection. Furthermore, the conditions are simple to control and easy to implement. Simultaneously, the condensation reaction generates a dipeptide intermediate, laying a good product foundation for subsequent preparation steps of dipeptide-2. In addition, the process of this invention is rapid, the operation steps are simple and clear, and the reagents used are readily available and inexpensive, making it very suitable for large-scale industrial production and providing a new synthetic route for the preparation of dipeptide-2.

The invention provides an electrolyte for a capacitor, the electrolyte comprises a sodium salt, an organic solvent and an additive, and the additive comprises an inorganic additive and an organic additive; the inorganic additive comprises at least one of sodium tetrafluoroborate and sodium difluoro (oxalato) borate; the organic additive comprises at least one of vinylene carbonate, 1, 3-propane sultone, ethylene sulfate, tris (2, 2, 2-trifluoroethyl) phosphite, ethyoxyl (pentafluoro) cyclotriphosphazene, methyl nonafluorobutyl ether, biphenyl, tris (trimethylsilyl) phosphite and trimethoxy (perfluorophenyl) silane, and the organic additive comprises at least one of ethylene carbonate, 1, 3-propane sultone, ethylene sulfate, tris (2, 2, 2-trifluoroethyl) phosphite, ethyoxyl (pentafluoro) cyclotriphosphazene, methyl nonafluorobutyl ether, biphenyl, tris (trimethylsilyl) phosphite and trimethoxy (perfluorophenyl) silane. When the electrolyte is applied to the sodium metal capacitor, the sodium metal capacitor can have excellent cycle stability and cycle life.