烯烃

An intramolecular α-addition of hydroxy or amine-substituted electron-deficient alkyns catalyzed by phosphines was developed. An intramolecular β-addition of hydroxysubstituted 2-alkynoates trigged by the tributylphosphine was also achieved.

在上面的研究中发现低活性的亚甲基取代的环内酰胺的[3+2]环加成反应也能顺利进行，因此我们研究并实现了β-位取代的贫电子烯烃的环加成反应，进一步拓展了叔膦催化的[3+2]环加成反应。

Furthermore, the pour point test results showed that the addition of PAO and pour point depressant could effectively improve the low temperature fluidity of modified soybean oils.

倾点试验结果表明，聚-α-烯烃和降凝剂的加入还可以明显提高改性大豆油的低温流动性能。

In the selective oxidations, Manganese porphyrin mimic enzyme systems supported on different inorganic supports are designed and developed, which are applied in studies of green processes, such as, the selective olefin epoxidation with oxygen in either ionic liquid or water, the oxidation of alcohols.

在选择性氧化反应中，设计制备了不同无机载体的锰卟啉模拟酶体系，分别在离子液选择性和水相中开展了以氧气为氧源的烯烃环氧化、醇的氧化等绿色反应过程的研究。

Some technologies,including olefines from methanol,oxalates and ethylene glycol from carbon monoxide,carbon dioxide-based polymers,chemicals from the syngas prepared by biomass gasification,acetone and butanol by fermentation,and chemicals from acetylene,ethanol,glycerol,furfural,hydroxymethyl furfural and starch,were reviewed.

包括甲醇制烯烃，一氧化碳制草酸酯和乙二醇，乙炔化学品，二氧化碳聚合物，生物质气化合成化工产品，发酵法生产丙酮、丁醇，乙醇衍生化工产品，甘油合成化工产品，糠醛和羟甲基糠醛合成化工产品，淀粉合成化工产品等重要的石油替代化学品生产技术被介绍。

This catalyst is designed to ensure the reduction of the olefins in gasoline.

为一种可降低汽油烯烃含量的催化剂。

With the increase of Ce content, light olefins selectivity increases too.

随铈含量的增加，催化剂的烯烃选择性有所增加。

In order to meet the environmental protection demand of automobile exhaust emission.the olefins in gasoline has to be controlled.

为满足日趋苛刻的汽车尾气环保要求，汽油烯烃含量也必须严格控制。

Olefins are important materials for modern petrochemical and fine chemical industry, anda large amount of products.

烯烃是现代石油化工、精细化工的重要原料，需求量很大。

With the increase of Mn content, light olefins selectivity increases and catalytic activity decreases.

随锰含量的增加，催化剂的烯烃选择性有所增加，但催化活性下降。

The carbonylation of olefins developed by Reppe is an important method to prepare a considerable nu...

烯烃的羰基化反应是合成一系列含氧有机精细化学品的重要方法。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。