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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 25. Отображено 25.
23-06-2023 дата публикации

Preparation method of chitosan quaternary phosphonium salt

Номер: CN116284497A
Автор: LEE MYEONG-CHUN, WANG LIN, XIN MEIHUA, LIU WENFENG
Принадлежит:

The invention relates to a chitosan quaternary phosphonium salt preparation method, which comprises: 1, dissolving a substance A, which is parachloromethyl benzoic acid, in an organic solvent, adding a substance B, and carrying out a reaction to obtain a small molecule quaternary phosphonium salt; the substance B is triphenylphosphine; step 2, dissolving chitosan in an acetic acid aqueous solution; step 3, dissolving micromolecular quaternary phosphonium salt in water or a water/ethanol mixed solution, and adding 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide until the 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and the N-hydroxysuccinimide are completely dissolved to obtain a micromolecular quaternary phosphonium salt solution; step 4, adding the micromolecular quaternary phosphonium salt solution into the chitosan solution for reaction; and step 5, after the reaction is finished, concentrating and drying to obtain the chitosan quaternary ...

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Номер записи: 1
21-04-2023 дата публикации

Motion control method and device and robot

Номер: CN115993814A
Автор: LIU WENFENG, LI YONGCHUAN
Принадлежит:

The invention provides a motion control method and device and a robot, and the method comprises the steps: determining a current pitch angle of the robot if the robot is in a starting state or a moving state; if the current pitch angle of the robot is larger than or equal to the first specified angle value, the robot is driven to advance based on the target speed, and the target speed is larger than the current speed of the robot. Through the motion control method, the working efficiency of the robot can be improved.

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Номер записи: 2
13-04-2021 дата публикации

Transfer barrel for liquid materials

Номер: CN212952221U
Автор: JIN JIANQING, CHEN SHENGWEI, XU JIANJIANG, LIU WENFENG, LIN DONGTAI, 金建清, 陈圣伟, 许建江, 刘文锋, 林东态
Принадлежит: LIVZON GROUP FUZHOU FUXING PHARMACEUTICAL CO LTD, LIVZON GROUP FUZHOU FUXING PHARMACEUTICAL CO., LTD., 丽珠集团福州福兴医药有限公司

The utility model discloses a transfer barrel for liquid materials, which belongs to the technical field of chemical production equipment and comprises at least one barrel body and a base. The base is of a rectangular frame structure, and the bottom of the barrel body is fixedly connected with the base. At least two handles are arranged on the outer side wall of the barrel body and are oppositely arranged; a discharge port is formed in the bottom of the barrel body, and a hose is arranged at the discharge port; a feeding hole, an air inlet, an observation window, a safety valve and a pressure gauge are arranged at the top of the barrel body; and brake wheels are arranged below the base. The transfer barrel for the liquid materials is mainly used for transferring and transferring the liquid materials, the barrel body is directly and fixedly connected with the base with the brake wheels, and movement of the barrel body can be directly achieved. The transfer barrel does not need to be fixed ...

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Номер записи: 3
15-08-2019 дата публикации

MULTI-MODAL PERFORMANCE-BASED ANTI-SEISMIC DESIGN METHOD BASED ON PERFORMANCE BISPECTRUM

Номер: WO2019153798A1
Автор: LIU, Wenfeng
Принадлежит:

The present invention relates to the technical field of anti-seismic design, and in particular relates to a multi-modal performance-based anti-seismic design method based on a performance bispectrum. The method is used for anti-seismic design directly based on a quantified performance level. First, a single-degree-of-freedom elastic-plastic structural system of a performance bispectrum is artificially assumed and is enabled to be equivalent to a standard single-degree-of-freedom elastic-plastic structural system by adjusting a performance displacement angle ρobj-m(d) of a structure top layer and second stiffness of a double-broken-line elastic-plastic model, thus obtaining a structural anti-seismic response effect at an anti-seismic performance level. The performance level based anti-seismic design method of the present invention takes a final damage state as a basis of anti-seismic design; therefore, whether an earthquake exceeding the seismic fortification intensity (a ground motion parameter ...

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Номер записи: 4
23-06-2023 дата публикации

Wind speed prediction method based on ARMA and SVR

Номер: CN116307089A
Автор: JIAO XUGUO, ZHANG DAOYUAN, MU GUOQING, YANG QINMIN, MENG WENCHAO, LIU WENFENG
Принадлежит:

The invention discloses a wind speed prediction method based on ARMA and SVR. According to the method, an ARMA model is established by using historical data, a data set is divided by using an order determined by the ARMA model, and finally, an SVR model is trained by using the divided data and prediction is performed. Before a data set is divided, an ARMA modeling method is utilized to carry out order determination on an original data set, the data set is divided by utilizing an obtained value of a partial autocorrelation coefficient p to obtain a plurality of sections of time sequences with relatively strong correlation, the divided data is divided into a training set and a test set, the training set is used for training an SVR model, and the test set is used for training the SVR model. The method comprises the following steps of: training a data set, testing the prediction effect of the trained model by using a test set, changing the p value of the divided data to establish a new model ...

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Номер записи: 5
10-10-2019 дата публикации

METHOD FOR ESTIMATING SETTING OF SEISMIC RISK FOR PERFORMANCE-BASED SEISMIC DESIGN

Номер: WO2019192166A1
Автор: LIU, Wenfeng
Принадлежит:

A method for estimating setting of seismic risk for performance-based seismic design. The estimating method considers the exceedance probability of a performance level, determines a structural performance level by setting an exceedance probability, determines a seismic demand when the performance level is constant, sets an exceedance probability of the seismic demand, and combines same with the setting of seismic risk of a seism, so as to finally determine a seismic motion input, thereby establishing a probabilistic seismic risk estimating method reaching a certain performance level. The present method enhances design control and objectives.

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Номер записи: 6
16-04-2020 дата публикации

METHOD FOR CALCULATING ANTI-SEISMIC BEARING CAPACITY OF STRUCTURAL COMPONENT ON BASIS OF PERFORMANCE LEVEL

Номер: WO2020073364A1
Автор: LIU, Wenfeng
Принадлежит:

A method for calculating the anti-seismic bearing capacity of a structural component on the basis of performance level, comprising: setting different performance levels by using the maximum interlayer displacement angle of a structure, and calculating structure vertex displacement at different performance levels; determining first mode of vibration displacement according to a first mode of vibration mass participation factor and the structure vertex displacement at different performance levels; obtaining the displacement of an equivalent single-degree of freedom system according to the first mode of vibration displacement; selecting ground motion suitable for a site to obtain a first mode of vibration earthquake impact factor at different performance levels; obtaining an earthquake impact factor according to a design response spectrum stipulated by anti-seismic specifications on the basis of the peak acceleration average of a plurality of ground motion at different performance levels; synthesizing ...

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Номер записи: 7
29-08-2023 дата публикации

Automatic high-frequency dry-wet switching wiping device

Номер: CN116651793A
Автор: WU KAI, ZHU JUNYONG, TANG GUOSEN, LIU WENFENG
Принадлежит:

The invention discloses an automatic high-frequency dry-wet switching wiping device which comprises a rack assembly, a dust-free cloth circulating assembly, a spray valve and a pressing wiping mechanism, the dust-free cloth circulating assembly comprises at least one cloth feeding wheel, at least one cloth collecting wheel and a dust-free cloth belt, and the spray valve sprays wiping liquid along the dust-free cloth belt. The pressing wiping mechanism is arranged at the side part of the spray valve and is used for wiping; the pressing wiping mechanism comprises a pressing sliding table air cylinder, a wiping head, a motor assembly, an eccentric shaft assembly and a reciprocating sliding block, and the wiping head is fixed to the lower portion of the reciprocating sliding block; the wiping head abuts against the dust-free cloth belt, the product to be wiped is located on the lower portion of the dust-free cloth belt, and the wiping mechanism is pressed to operate to drive the wiping head ...

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Номер записи: 8
27-02-2020 дата публикации

PLATE-LIKE HEATING UNIT FOR REFRIGERATION EQUIPMENT

Номер: WO2020037855A1
Автор: ZHAO, Yuhuan, LIU, Wenfeng
Принадлежит:

A plate-like heating unit (1) for a refrigerator, an air conditioner and a heat pump unit, comprising a heating unit body (1), wherein the heating unit body (1) comprises an electric heating layer (2) and an insulating layer (3); the electric heating layer (3) is coated with the insulating layer (2); a conducting terminal (5) of the electric heating layer (2) extends out of the insulating layer (3); a water receiving tray (6) is provided at the bottom end of the heating unit body (1); and the water receiving tray (6) is provided with a draining opening (7). The plate-like heating unit may be arranged around an evaporator or arranged inside the evaporator, so that the heating area is thus obviously increased, and the energy efficiency ratio is remarkably increased. The plate-like heating unit is provided with the water receiving tray (6), which reduces the amount of components and parts. The water receiving tray (6) also has a heating function so as to prevent water therein from freezing ...

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Номер записи: 9
01-08-2023 дата публикации

Purification method of teicoplanin

Номер: CN116514927A
Автор: LIU WENFENG, LIU XIAOGANG, XU WENCAN, LIN HONGXING, GUO TENGXIN, WANG WEIMIN
Принадлежит:

The invention relates to the field of medicines, in particular to a method for purifying teicoplanin. The purification method comprises the following steps: S1, diluting teicoplanin coarse powder with water, and then adding ethanol to obtain column loading liquid; s2, preparing a prewashing solution and an eluent from water, ethanol and soluble salt respectively; s3, the column loading liquid is loaded on a chromatographic column, the chromatographic column is loaded with UniHybrid C18 monodisperse silica gel chromatographic filler, the chromatographic column is pre-washed with the pre-washing liquid and then eluted with the eluent until the content of teicoplanin in filtrate is lower than 300, the filtrate is collected, and effective collection liquid is obtained; and S4, carrying out alcohol removal desalination on the effective collected liquid, concentrating, and crystallizing. According to the purification method provided by the invention, the content of unknown impurities can be reduced ...

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Номер записи: 10
04-07-2023 дата публикации

Wind speed prediction method based on VMD-SVR

Номер: CN116384586A
Автор: JIAO XUGUO, ZHANG DAOYUAN, TIAN YANBING, DENG ZHAOPENG, YANG QINMIN, MENG WENCHAO, LIU WENFENG, GONG LI, WU HAOTIAN
Принадлежит:

The invention discloses an SVR wind speed prediction method based on VMD decomposition. The method comprises the following steps: decomposing a wind speed sequence by using a VMD algorithm to obtain a plurality of wind speed components; and independently predicting each component through an SVR model to obtain a predicted value of each component, and then adding each group of predicted values to obtain a wind speed prediction result. And finally, through an error compensation measure, training an SVR model by using the prediction error of the training set to predict a future error, and adding an obtained error prediction value and a wind speed prediction value to obtain a wind speed prediction result after error compensation. Finally, a verification experiment is carried out through real data of a certain wind power plant in China, and it is proved that compared with a traditional prediction method, the method can effectively reduce prediction errors caused by prediction lag. Compared with ...

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Номер записи: 11
29-11-2012 дата публикации

MULTIPLE-OBJECTIVE AND PERFORMANCE-BASED EARTHQUAKE PROOF METHOD OF ENGINEERING STRUCTURES

Номер: WO2012159239A1
Автор: LIU, Wenfeng
Принадлежит:

A multiple-objective and performance-based earthquake proof method of engineering structures comprises following steps: (1) Setting a performance target of the engineering structure; (2) Inputting different performance targets into a single degree of freedom elasto-plastic structural system to conduct a simulation test; (3) Continually adjusting a magnitude of an earthquake wave, confirming a functional relationship between a seismic influence factor and a structure cycle under achieving the different performance targets, and obtaining earthquake demand spectrum curve; (4) Utilizing an analytical method to obtain a relationship between a shearing force and a displacement in the engineering structure; (5) Transforming the relationship between the shearing force and the displacement in the engineering structure into the functional relationship between the performance and the displacement under the single degree of freedom system, and obtaining a structure performance spectrum curve; (6) Comparing ...

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Номер записи: 12
09-04-2021 дата публикации

Computer teaching projection curtain wall based on UI virtual design

Номер: CN212933220U
Автор: LIU WENFENG, 刘文锋
Принадлежит: LIU WENFENG, 刘文锋

The utility model discloses a UI virtual design-based projection curtain wall for computer teaching, which belongs to the technical field of projection curtain walls and comprises a shell and a side plate, a groove is formed in the front surface of the shell, a sunshade frame is arranged in the groove, the left side surface and the right side surface of the shell are fixedly connected with two ends of a moving mechanism respectively, and the moving mechanism is sleeved on the outer side of the shell. The back face of the shell is fixedly connected with a locking mechanism, and the locking mechanism is rotationally connected between the two side plates. According to the utility model, by arranging the curtain wall cloth, the silica gel pad, the reinforcing steel bars, the adjusting mechanism and the tightening mechanism, the reinforcing steel bars can support the silica gel pad under the action of the reinforcing steel bars, and the silica gel pad can support the curtain wall cloth to keep ...

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Номер записи: 13
08-08-2023 дата публикации

Inverter test method and system and storage medium

Номер: CN116559554A
Автор: YANG LIFEN, ZHANG XIAO, LIU FEI, LI XIAOWEN, LIU WENFENG, XU ZHEN, YU RENZHONG
Принадлежит:

The invention discloses an inverter testing method and system and a storage medium, and relates to the technical field of inverter testing, and the main points of the technical scheme are that the testing method comprises the following steps: providing an input voltage for a power panel, so as to output a working voltage to each to-be-tested board at the rear end through the power panel; acquiring a working voltage output by the power panel to each to-be-tested board; judging whether the power panel fails or not according to the working voltage; and if the power panel has no fault, testing the to-be-tested boards and the mutual matching performance, and judging whether the to-be-tested boards and the mutual matching performance have faults or not according to the test data. According to the test method, the functions of the to-be-tested boards can be tested, the matching test among the to-be-tested boards is comprehensively considered, the test depth and breadth of the product are improved ...

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Номер записи: 14
16-05-2023 дата публикации

Connector

Номер: CN116131009A
Автор: LIU WENFENG, QIAN HUA, XIE YONGQING, CHEN QING, YU JIEREN
Принадлежит:

The invention belongs to the field of connectors, and particularly relates to a connector which comprises a shell, a supporting frame and a connecting terminal, the shell is provided with a cavity, an opening and a wire outlet hole, the opening and the wire outlet hole are communicated with the cavity, and the supporting frame comprises a connecting part arranged on the opening side and a cable supporting part extending into the cavity from the connecting part. The cable supporting part is provided with a shielding pressing block making contact with the inner wall of the shell, the cable supporting part and the shielding pressing block are located between the opening and the wire outlet hole, the connecting terminal is arranged on the connecting part, and a leading-out wire of the connecting terminal penetrates through the position between the cable supporting part and the shielding pressing block and is led out of the wire outlet hole. On the premise of ensuring that the shielding pressing ...

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Номер записи: 15
04-04-2023 дата публикации

Fault early warning method, device and equipment for pressure control electromagnetic valve and storage medium

Номер: CN115899366A
Автор: YU JIEREN, QIAN HUA, LIU WENFENG, LIANG PENG, XIE YONGQING
Принадлежит:

The invention relates to a fault early warning method and device for a pressure control electromagnetic valve, equipment and a storage medium. The method comprises the following steps: setting an observation period, and respectively counting the collection action times of an electromagnetic valve in an inflation state and an exhaust state in the observation period; when the collection action times exceed the threshold upper limit of the historical action times in the historical database, prompting to recognize the captured oscillation characteristic data; according to the oscillation characteristic data, pressure detection is conducted on the electromagnetic valve in the inflation state and the exhaust state, and when it is detected that deviation exists between the pressure variation and data in a historical database and the deviation exceeds a threshold value, fault early warning is conducted on the electromagnetic valve. The method is based on an evaluation reference value of historical ...

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Номер записи: 16
25-08-2023 дата публикации

Smoke exhaust pipe clamping tool of engine testing rack

Номер: CN116642699A
Автор: LIU WENFENG, XIE CHANG, WEI CHENG, LI ZHIHUA, HUANG BOCHUAN
Принадлежит:

The invention provides a smoke exhaust pipe clamping tool of an engine testing rack, and relates to the technical field of smoke exhaust pipe clamping tools, and the smoke exhaust pipe clamping tool comprises a lock wrench body and a clamping assembly. The clamping assembly comprises two semicircular cast iron clamps with opposite openings, the two semicircular cast iron clamps are connected with the two opposite side faces of a jaw of the locking pliers body respectively, and the two semicircular cast iron clamps are each provided with an arc-shaped groove matched with a to-be-assembled part in a clamped mode. Compared with a common stainless steel clamp, the thick semicircular cast iron clamp and the arc-shaped groove formed in the thick semicircular cast iron clamp are higher in high temperature resistance and better attached to a to-be-clamped part, and the problem that a common stainless steel smoke exhaust pipe clamp is usually thin, and clamping is not stable due to the fact that ...

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Номер записи: 17
14-04-2023 дата публикации

Integrated pneumatic pressure regulating device

Номер: CN115959102A
Автор: XIE YONGQING, LI TAIPENG, QIAN HUA, LIU WENFENG, YU JIEREN
Принадлежит:

The invention provides an integrated pneumatic pressure regulating device which comprises a relay valve, a shuttle valve, a service brake pressure regulating loop, an emergency brake pressure regulating loop and a first electromagnetic valve which are integrated in a module, and the relay valve comprises a first control cavity and a second control cavity. The air source inlet is used for being connected with a high-pressure air source, the exhaust port is communicated with the atmosphere, the pressure outlet is used for outputting first pressure, and the first pressure is controlled by the pressure in any one of the first control cavity and the second control cavity; the shuttle valve is provided with a first inlet connected with the output end of the service brake pressure regulating loop, a second inlet connected with the output end of the emergency brake pressure regulating loop and a first outlet connected with the first control cavity, and the shuttle valve is configured to enable ...

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Номер записи: 18
19-05-2023 дата публикации

Hydraulic valve control method and device and vehicle hydraulic brake control system

Номер: CN116135623A
Автор: YING ZHENHUA, QIAN HUA, YU JIEREN, XIA SHUAI, LIU WENFENG, DAI BOWEN
Принадлежит:

The invention discloses a hydraulic valve control method and device and a vehicle hydraulic brake control system. The hydraulic valve control method comprises the steps that a target pressure value of a current request and an actual output pressure value currently corresponding to a hydraulic valve are obtained; according to the target pressure value and the actual output pressure value, a preset closed-loop control algorithm model is adopted for calculation to obtain a control output value; and based on the control output value, the duty ratio of a driving signal output by the driving circuit to the hydraulic valve is adjusted, and the adjusted duty ratio is equal to the duty ratio corresponding to the control output value. By the adoption of the hydraulic valve, the output pressure corresponding to the adjusted hydraulic valve can be accurately controlled.

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Номер записи: 19
18-07-2023 дата публикации

Vehicle braking system

Номер: CN116442971A
Автор: LIU XIONG, LIU WENFENG, QIAN HUA, XIE YONGQING, YU JIEREN
Принадлежит:

The invention provides a vehicle braking system. The system comprises an air spring sensor for providing air spring pressure data; the relay valve is provided with a first pressure outlet for outputting the pressure of the brake cylinder, and a first control cavity and a second control cavity for controlling the pressure value of the brake cylinder; the emergency braking unit is provided with a load valve and an emergency electromagnetic valve which are connected with each other, the load valve is further connected with the air spring sensor and outputs emergency braking pressure to the first control cavity according to the air spring pressure data, and the emergency electromagnetic valve is further connected with the first control cavity; the service braking unit is provided with a pressure limiting valve and a service electromagnetic valve set which are connected with each other, and the service electromagnetic valve set is further connected with the second control cavity and outputs ...

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Номер записи: 20
04-07-2023 дата публикации

Method for avoiding disorder and fragmentation of national secret IPSecVPN gateway data packets

Номер: CN116389169A
Автор: LIU WENFENG, YOSHIMINE
Принадлежит:

The invention discloses a method for avoiding disorder and fragmentation of national secret IPSecVPN gateway data packets, which comprises the following steps of: S1, establishing an IPSec tunnel between a first IPSecVPN gateway device and a second IPSecVPN gateway device, and negotiating between the two IPSecVPN gateway devices to generate unique SPI (Serial Peripheral Interface) values which are respectively SPI1 and SPI2; s2, respectively associating the SPI1 and the SPI2 with the corresponding SA; and S3, establishing TCP connection between the client side and the server side. According to the method for avoiding disorder and fragmentation of the national secret IPSecVPN gateway data packets, the SPI fields are used for transmitting TCP flow information, and disorder of the data packets is avoided; according to the method, the MSS value in the data packet transmitted in the IPSec tunnel is modified, the data packet is prevented from being fragmented, the performance of the IPSec VPN ...

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Номер записи: 21
09-05-2023 дата публикации

Feeding method for increasing content of polymyxin B2 in polymyxin B fermentation product

Номер: CN116083509A
Автор: LIN FU, LIU WENFENG, CHEN YILIN, LIN HUIBING, YU DONG
Принадлежит:

The invention belongs to the technical field of biological fermentation, and particularly relates to a material supplementing method for increasing the content of polymyxin B2 in a polymyxin B fermentation product. In a fermentation mode of material supplementing batch fermentation, after fermentation culture is performed for at least 12 hours, a valine solution is supplemented into a fermentation solution in an intermittent material supplementing mode. According to the material supplementing method provided by the invention, the content of the polymyxin B2 in the polymyxin B fermentation product can be effectively increased to 0.7 g/L or above, and the purity reaches 23% or above.

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Номер записи: 22
27-06-2023 дата публикации

Wind speed prediction method based on error compensation

Номер: CN116341717A
Автор: JIAO XUGUO, ZHANG DAOYUAN, TIAN YANBING, YANG QINMIN, MENG WENCHAO, LIU WENFENG
Принадлежит:

The invention discloses a wind speed prediction method based on error compensation, and the method comprises the steps: building an ARMA model through employing historical data, dividing a data set through employing the fixed order of the ARMA model, training an SVR model through employing the divided data, carrying out the wind speed prediction, carrying out the subtraction of a real wind speed value of a training set from a predicted wind speed value, and obtaining an error training set. And for the obtained error training set, establishing an ARMA model for the error sequence by using the method, and dividing the error training set by using the partial autocorrelation coefficient of the ARMA model as a basis. And after the error sequence is processed, predicting the error by using ELM, and adding an obtained error prediction result and a wind speed prediction result to obtain a wind speed prediction value after error compensation. Verification experiments prove that compared with a traditional ...

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Номер записи: 23
18-08-2023 дата публикации

Synthesis method of rimantadine hydrochloride

Номер: CN116606193A
Автор: XIANG PINGPING, WANG WUPU, GAO LEILEI, LIU XINGBO, LOU YADONG, LIU WENFENG
Принадлежит:

The invention belongs to the technical field of medicine synthesis, and particularly relates to a synthesis method of rimantadine hydrochloride, which comprises the following steps: by taking 1-bromoadamantane as a raw material, carrying out Grignard reaction, nucleophilic addition, ammoniation and salification to obtain a target compound. According to the invention, the bromoadamantane is directly subjected to two reactions such as Grignard reaction and subsequent direct ammoniation reaction, which are both the first application of preparation of rimantadine, in addition, after each step of reaction is completed, the operation or reaction of the next link can be directly carried out almost without any complete purification step, and the preparation method is simple and convenient. The whole reaction and treatment purification process is relatively simple. According to the method, 1-adamantane-1-yl-ethanol is synthesized by taking 1-bromoadamantane as a raw material, and rimantadine hydrochloride ...

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Номер записи: 24
07-07-2023 дата публикации

Preparation method and application of perfluoroalkane derivative

Номер: CN116396177A
Автор: LIU WENFENG, XUE XIU, ZHOU LIFENG
Принадлежит:

The invention provides a preparation method and application of a perfluoroalkane derivative, and the preparation method of the perfluoroalkane derivative comprises the following steps: adding 1.0 mmol of perfluoroamyl acetic acid or perfluorohexylacetic acid and 1.0 mmol of 2-diethylaminoethylamine, 2-diethylaminoethanol, 3-dibutylamino-1-propylamine or 3-dibutylamino-1-propanol into 20ml of solvent under the protection of nitrogen, stirring, reacting, filtering and drying to obtain the perfluoroalkane derivative. The preparation method comprises the following steps: adding the perfluoroalkane derivative into a reaction kettle, slowly dropwise adding 0.1 mmol of organic alkali as a catalyst, reacting at room temperature for 24 hours, concentrating, carrying out column chromatography separation to obtain an intermediate product, carrying out oxidation reaction on 1.5 mmol of the intermediate product under the action of a weak oxidant, and extracting to obtain a second-step product, namely ...

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Номер записи: 25