This paper reported the synthesis of 2-hydroxyl-1-naphthalene formaldehyde under microwave irradiation with 2-naphthol, hexamethylenamine, solvent of glacial acetic acide, catalysis of sulphuric acid, and discussed the influence of the time and the power of microwave radiation, the proportion and quantity of reagents to the synthetic yield.

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A novel non - metallocene supported catalyst, CpTiCl2/MgCl2 - SiO2/ MAO ,was prepared, and the catalysis involved in ethylene homo - polymerization, ethylene - 1 - hexylene and ethylene - styrene copolymerization was investigated.

研究開(kāi)發(fā)了一種新型非茂負(fù)載聚烯烴催化劑——CpTiCl2/MgCl2-SiO2/MAO无码高潮喷吹在线播放亚洲，并考察了該催化劑的乙烯均聚免费AAA级黄片、乙烯和1-己烯共聚及乙烯和苯乙烯共聚性能。

Both three-dimensional chiral compounds have intriguing chiral channels, which are built up of homochiral intertwined double helices. The circular dichroism spectra of 1 and 2 in water have shown they are stable in solution, which document they will be significantly useful in asymmetric catalysis and chiral medicine.

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This result to will study the nanometer TiO2 surface hydrone adsorption mechanism and prevented the reunion all has the vital significance, simultaneously to explained the scientific researcher accepts the rice noodle body photochemical catalysis in TiO2 to respond observes certain phenomena will also have the help.

這一結(jié)果對(duì)研究納米TiO2表面水分子吸附機(jī)理及其防止團(tuán)聚都有重要意義超碰免费在线91，同時(shí)對(duì)解釋科研人員在TiO2納米粉體光催化反應(yīng)中觀察到的某些現(xiàn)象也將有所幫助。

Manganese dioxide is a familiar katalyst of oxidation reaction,there are five kinds of crystal configuration of manganese dioxide that have known, and different kinds of crystal configuration of manganese dioxide have the different catalysis and natural life.

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The immobilization of laccase is important for the fiber optic biosensor based on enzyme catalysis.

漆酶的固定化研究對(duì)基于漆酶催化的光纖生物傳感器具有十分重要的意義国产一级a作爱片在线观看。

The dissertation mainly consists of two parts:1. The Reaction Chemistry of Alkynes under Palladium Catalysis Part 1 studies the reaction α,β-unsaturated carbonyl compounds with alkenylpalladium intermediate generated by nucleopalladation, and discovered 1 the Pd-catalyzed tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls,2 the four-component tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls, 3 the tandem intramolecular oxypalladation-conjugate additionreaction of alkynoic acids with α,β-enals. These new reactions provide notonly efficient highly stereoselective methods for the synthesis of γ,δ-unsaturated,polyunsaturated carbonyl compounds and γ-lactonic aldehydes, but also thebasic transformations for a number of C-C bond formation reactions which can be usedto design synthesis of many acyclic, cyclic or polycyclic compounds.

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The research results also show that the electrical catalysis of the electrodes can be enhanced evidently when the electrodes are added some Nafion latex,but it also found that the Nafion latax made by different method has the different effects on the discharge voltage and current density of the ion exchange membrane fuel cells.

實(shí)驗(yàn)結(jié)果還表明，在電極中加入適量的Nafion乳液可顯著地提高電極的電催化反應(yīng)活性欧美视频a，同時(shí)也發(fā)現(xiàn)添加不同方法配制的Nafion乳液人人操wwwcom，對(duì)燃料電池放電性能的影響也有一定的差別。

For the first time, enantiomers of C2-symmetric 1,1 -spirobiindane-7,7'-diol were resolved with crude menthyl chloroformate by phase-transfer catalysis in the presence of tetrabutylammonium bromide. The reaction was carried out at 0℃-rt. The diastereomers of SPINOL bis-menthyl carbonate can be separated by simple crystallization using alcohol. The hydrolysis of the diastereomers was carried out via aqueous NaOH/EtOH solution.

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The optimal reaction parameters of methanolysis of soybean oil by lipase-catalysis weredetermined as follows: 15wt% of lipase, 55℃of temperature, petroleum ether as solution,methanol was added by 6 times.

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