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

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Применить Всего найдено 10. Отображено 10.
26-10-2005 дата публикации

Cross couple method for synthesizing compound of liquid crystal from 2-2 phenyl phosphine ethanol through palladium catalysis

Номер: CN0001686972A
Автор: HE REN, GUO MENGPING, ZHOU LI, REN HE, MENGPING GUO, LI ZHOU
Принадлежит:

The present invention belongs to the field of fire chemical and material chemical technology, and provides a preparation method of cross-coupling reaction catalyst and technique for implementing catalytic reaction. The described catalyst is a di-diphenylphosphinethanol palladium type complex. Its preparation method is simple and convenient, its activity is high, selectivity is good, and it is stable in air. Said catalytic cross-coupling reaction can be implemented in organic solution under the condition of room temperature, normal pressure and basicity, the di-diphenylphosphinethanol palladium type complex can be used for catalyzing cross-coupling reaction between aromatic bromide and aromatic boric acid to produce biphenylyl type compound, in particular liquid crystal compound for biphenylyl type TFT-LCD.

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Номер записи: 1
08-10-2014 дата публикации

Synthesis method of sartanbiphenyl

Номер: CN104086456A
Автор: GUO MENGPING, QI LIANG
Принадлежит:

The invention provides a synthesis method of sartanbiphenyl. The method comprises the following steps: by taking o-chlorobenzonitrile which is relatively much cheaper than o-iodobenzonitrile and o-bromobenzonitrile as an initial material, and water and PEG400 (1:1) as a solvent, heating to 80 DEG C in air and reacting for 6 hours under existence of alkali; obtaining the purified product by simple separation and purification. The catalyst adopted by the method is an in-situ catalytic system formed by a palladium compound/a carboxylate ligand containing nitrogen; the catalytic system is low in price, high in catalytic activity, good in selectivity, and stable in air and water solution. Reaction between o-chlorobenzonitrile and 4-methyl phenyl boronic acid is catalyzed to synthesize sartanbiphenyl in one step. Thus the method is few in reaction steps and simple in aftertreatment, and the sartanbiphenyl is easily separated and purified, and is high in yield. Water and PEG400, which are low ...

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Номер записи: 2
08-10-2014 дата публикации

Preparation method of felbinac

Номер: CN104086394A
Автор: GUO MENGPING, LIU SHIWEN
Принадлежит:

The invention provides a fast and convenient, green and environment-friendly synthesis method of felbinac. Safe and non-toxic p-bromophenylacetic acid and phenylboronic acid are taken as raw materials and react in pure water in air at room temperature for 2 hours, and the pure product can be obtained by simple separation and purification. A catalyst adopted by the method is an amino acetic acid palladium complex, which is simple in synthesis, simple in structure, insensitive to air and moisture, strong in water solubility, and high in activity. Reaction between p-bromophenylacetic acid and phenylboronic acid is catalyzed to synthesize felbinac in one step. Thus the method is mild in synthesis condition, few in reaction steps, simple in aftertreatment, easy to separate and purify, high in productivity, free of pollution to the environment, green and environment-friendly, and accords with the requirements of large-scale industrial production.

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Номер записи: 3
08-10-2014 дата публикации

Preparation method of paracyanobenzoic acid and paracyanobenzoic acid catalyst

Номер: CN104086455A
Автор: GUO MENGPING, FU LEIQING
Принадлежит:

The invention provides a preparation method of paracyanobenzoic acid and a paracyanobenzoic acid catalyst. The preparation method comprises the following steps: by taking low-price and low-toxic K4[Fe(CN)6]3H2O as a cyanation reagent and (o-Ph2PC6H4COO)2Pd as a catalyst, and catalyzing cyanation reaction of parabromobenzoic acid to synthesize paracyanobenzoic acid. According to the synthetic method, a raw material is safe and nontoxic, the catalyst is stable, high in activity and good in selectivity, catalytic synthesis reaction conditions are convenient, few reaction steps are performed, product post-processing is simple, separation and purification are easy, the yield is high, three-waste quantity is low, the raw material cost is relatively low, and industrialized application is facilitated.

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Номер записи: 4
08-10-2014 дата публикации

Catalytic synthesis method for biphenylacetic acid

Номер: CN104086392A
Автор: GUO MENGPING, XIE WENNA
Принадлежит:

The invention belongs to the fields of fine chemical engineering and pharmaceutical chemical engineering and provides a catalytic synthesis method for biphenylacetic acid. The catalytic synthesis method comprises the following steps of with cheap and easily-obtained p-chloroacetophenone and phenylboronic acid as raw materials, reacting in pure water under the condition of air at the temperature of 100 DEG C for 6h to obtain phenylacetophenone at high yield; carrying out one-step Willgerodt-Kindler reaction, and then, carrying out simple separation and purification operations to obtain pure biphenylacetic acid. A catalyst adopted in the method is an aminoacetic palladium chloride complex which is simple and convenient to synthesize, simple in structure, low in price, insensitive in air and moisture, strong in water solubility, high in activity and good in selectivity; in addition, the pure water is used as a solvent, so that the catalytic synthesis method is mild in synthesis condition, ...

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Номер записи: 5
26-10-2005 дата публикации

Cross couple method for synthesizing compound of liquid crystal by 2-2 phenyl palladium phosphine ethylamine catalysis

Номер: CN0001686979A
Автор: HE REN, GUO MENGPING, ZHOU LI, REN HE, MENGPING GUO, LI ZHOU
Принадлежит:

The present invention belongs to the field of fine chemical and material chemical technology, and provides a preparation method of catalytic cross-coupling reaction catalyst and technique for implementing catalytic reaction. The described catalyst is di-diphenylphosphinethamine palladium type complex. Its preparation method is simple and convenient, its activity is high and selectivity is good, it is stable in air. Said cross-coupling reaction is characterized by that under the condition of normal temperature, normal pressure and basicity the di-diphenylphosphinethamine palladium type complex can be used to catalyze cross-coupling reaction between aromatic bromide and aromatic boric acid to produce biphenylyl type compound, in particular liquid crystal compound for biphenylyl type TFT-LCD.

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Номер записи: 6
10-09-2014 дата публикации

Rare-earth metal oxide/polyacrylonitrile (PAN) composite fiber and preparation method thereof

Номер: CN104032403A
Автор: LI XUELIAN, YANG GUANGJUN, GUO MENGPING, SONG JINCAN, YANG TINGJUN
Принадлежит:

The invention relates to a rare-earth metal oxide/polyacrylonitrile (PAN) composite fiber and a preparation method thereof. The preparation method comprises the steps of (1) dissolving nanoscale rare earth lanthanum oxide into anhydrous acetic acid, and dissolving PAN powder into N,N-dimethylacetamide (DMAc) solvent to form a homogeneous solution, wherein a small amount of lithium chloride is fed into the N,N-DMAc solvent; (2) mixing the prepared lanthanum acetate solution and the PAN solution according to a certain volume ratio for dissolving to obtain homogeneous mixed spinning dope; (3) defoaming, filtering and balancing the spinning dope, and spinning by an electrospinning technique to obtain nano-composite fiber felt loaded with rare earth lanthanum, wherein the nano-composite fiber felt has the advantages of being light in weight, large in specific surface area, and the like; and (4) defoaming, filtering and balancing the spinning dope, and spinning by a wet spinning technique to ...

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Номер записи: 7
01-10-2014 дата публикации

Preparation method for diflunisal and catalyst thereof

Номер: CN104072364A
Автор: GUO MENGPING, LIU SHIWEN
Принадлежит:

The invention provides a preparation method for diflunisal and a catalyst thereof. The preparation method is as follows: pure water is used as a solvent, the coordination complex [(NH2CH2COOH) 2PdCl2] of palladium chloride and glycine is used as a catalyst, potassium carbonate is used as alkali, and the diflunisal is obtained through catalyzing 5-salicylic acid and 2,4-difluoro phenylboronic acid through the Suzuki cross-coupling method in air under the indoor temperature. According to the invention, on the one hand, the catalyst is cheap, the structure is simple, the synthesis is easy, the property is stable and the activity is high; on the other hand, raw materials are safe and non-poisonous, the reaction procedure is few, the operation is convenient, the post-treatment is simple, separation and purification are easy, the productive rate is high, the synthesis condition is mild, and the requirements for mass industrial production can be met; organic solvents which are inflammable, explosive ...

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Номер записи: 8
01-07-2015 дата публикации

Biphenyl-type fluorine-containing liquid crystal monomer as well as catalyst and preparation method thereof

Номер: CN104744208A
Автор: GUO MENGPING, XIE WENNA
Принадлежит:

The invention provides a biphenyl-type fluorine-containing liquid crystal monomer as well as a catalyst and a preparation method thereof. The biphenyl-type fluorine-containing liquid crystal monomer is prepared by taking a fluoro-substituted phenylboronic acid and aryl bromides as raw materials through reacting in a solvent, i.e., dissolving the raw materials in a solvent, and in the presence of alkali and a catalyst, stirring to react for 2-10 hours at room temperature; and sequentially carrying out extraction, drying, filtration, concentration and crystallization on the obtained product, According to the invention, the molar mass rate of the fluoro-substituted phenylboronic acid to the aryl bromides is controlled at (1-3):(3-1); a Suzuki cross-coupling reaction is adopted, i.e., in the air and at room temperature, the fluoro-substituted phenylboronic acid and various aryl bromides are rapidly and conveniently catalyzed to react in a non-toxic and harmless solvent so as to synthesize a ...

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Номер записи: 9
16-03-2005 дата публикации

Process for synthesizing liquid crystal compound by catalytic cross-coupling of diphenyl-phosphino- palladium acetate

Номер: CN0001594333A
Автор: HE REN, GUO MENGPING, ZHOU LI, REN HE, MENGPING GUO, LI ZHOU
Принадлежит:

The invention discloses a process for preparing catalyst for catalyzing crossed coupling reactions and method for carrying out the catalytic reaction, wherein the catalyst is diphenyl phosphonoacetic acid palladium type complex, and the crossed coupling reaction can be employed to generate linked benzoid compound, in particular TFT-LCD use LCD compound.

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Номер записи: 10