丙烷

The chiral ligands la-lf were used in the copper catalyzed asymmetric addition of diethylzinc to imines.

第二部分探索了一个新的含氮杂环丙烷的手性膦配体2的合成方法。

This thesis focuses on the transformation of amines and imines under the condition of Barbier-type reactions,and also the synthesis of aziridines catalyzed by the PhI_2/I_2 system.

本论文主要对锌试剂Barbier型条件下胺、亚胺的转化和PhI_2/I_2体系下氮杂环丙烷的合成做了一些研究。

The energy required is obtained from burning fuels, whether it be in gas or liquid form such as propane, kerosine, diesel or even vegetable oils!

所需的能量是从燃烧的燃料，无论是在气体或液体的形式，如丙烷，煤油，柴油，甚至植物油！

The impure carbon dioxide which can be obtained from any available source of carbon dioxide will typically contain as impurities sulfur compounds such as carbonyl sulfide, hydrogen sulfide, dimethyl sulfide, sulfur dioxide and mercaptans, hydrocarbon impurities such as aldehydes, alcohols, aromatics, propane, ethylene, and other impurities such as water, and carbon monoxide.

可由任何二氧化碳源得到的低纯度二氧化碳通常含有以下杂质：硫化合物，例如硫化羰、硫化氢、二甲硫、二氧化硫和硫醇；烃杂质，例如醛、醇、芳族化合物、丙烷、乙烯；以及其它杂质，例如水和一氧化碳。

When the doses are between 10 and 1 000 kGy,the main light hydrocarbons produced by radiation degradation of N,N-diethyl hydroxylamine are methane, ethane, ethene, propane and n -butane.

结果表明：当吸收剂量为10～1000kGy时，N，N 二乙基羟胺水溶液辐解产生的气态烃类主要有甲烷、乙烷、乙烯、丙烷和正丁烷。

Besides their physiological functions in the biosynthesis of phenylpropanoid, terpenoid and fatty acid, CYP450s metabolize exogenous chemicals including herbicides.

它不但能够催化苯丙烷类、萜类化合物和脂肪酸等内源性物质的生物合成，而且参与许多外源性物质包括除草剂等的生物氧化。

In the CsF promoted Strecker reactions of 2-aziridinesulfinimines, the sulfinyl group controlled the diastereoselective addition.

加成产物经氮杂环丙烷开环可合成所有构型的一系列α、β-二氨基酸和α、β-二氨基膦酸。

The results showed that:(1) The drug micropellet with reasonable drug entrapment ratio and release velocity would be obtained if the amountof crosslinking agent and drugs was controlled successfully;(2) The Ibuprofen micropellet had a suitable release rate in artificial intestinal juice but it was a very low release rate in artificial succus gastrius because it had a low solubility in acid medium.

以环氧氯丙烷为交联剂，羟丙基壳聚糖为载体，将布洛芬做成缓释控释药物微丸，讨论了包埋条件对微丸性能的影响以及药物在人工胃液和人工肠液中的释放行为。结果表明：(1)合理控制交联剂用量和药物投入量，能够得到药物包封率和释放性能良好的药物微丸；(2)布洛芬药物微丸在人

The effect of the concentrations of precursor and propylene oxide on the gelation time is investigated, and the suitable conditions have been determined for the preparation of coating sols.

通过考察无机盐前驱体和环氧丙烷的浓度对凝胶时间的影响，确定了适宜的工艺条件。

The total production capacify is 130,000 t/y for PO plant and 110,000 t/y for PPG plant , PO is an important organic chemical materially not only can be used for the production of production of pilules and furthermore for the pr addiction of pilules and furthermore for the production of polyurethane (including rigid foam , flexible foam and elastomer etc), but also can be used for the production of non-ionic surfactant , oil-field hard emulsifier , flame inhibitor , pesticide e,I;sofoer

环氧丙烷是一种重要的有机化工原料，它不仅可以生产聚醚多元醇，进而生产聚醚酯等，它还可以生产非离子型表面活性剂、油田破乳剂、阻燃剂、农药乳化剂和润湿剂等。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷