烯

Almost 100% selectivity to cyclohexene could be obtained when the molar ratio of acetic acid to cyclohexane was 12.9∶1 at 450 ℃, the conversion of cyclohexane was 6.9%.

反应温度为450 ℃，醋酸与环己烷的摩尔比为12.9∶1时，环己烷的转化率为6.9%，环己烯的选择性为100%。

In the first part, chemical synthesis, including by acraldehyde, malonic ester, ami no lactone and others were discussed and synthesis by hydantoin was emphasized.

第一部分讨论了DL-蛋氨酸及其衍生物的化学合成，包括丙烯醛法、丙二酸酯法，氨基内酯法等，并着重介绍了海因法。

The reaction process in methanol solvent can be deduced from the computational results with CPCM solvent model and the supermolecular handling, namely the reaction involves four steps in the methanol solvent. The nucleophilic addition of trimethylamine to acraldehyde generates an enolate. Nucleophilic attack of the enolate on the aldehyde forms the carbon-carbon bond, followed by the proton-transfer process and the further elimination generating the product and liberating the trimethylamine catalyst.

对于CH3OH对反应体系的影响，可以综合考虑CPCM溶剂模型及超分子模型下的研究结果，即CH3OH溶剂中反应按四步进行，催化剂三甲胺首先与丙烯醛发生亲核加成，生成的两性离子中间体与甲醛发生类似于Aldol的醛醇缩合，形成碳-碳键，之后发生分子内质子转移，最后经E1cb消除得到产物，并释放催化剂三甲胺。

In order to look for this, we inspected what happens when acrolein interacts with the zeolite Fig.

为了寻找这一点，我们检查时会发生什么丙烯醛与沸石相互作用（图3）。

The selective oxidation of propane to acrolein is an important reaction for the utilization of light alkanes.

丙烷选择氧化制丙烯醛是低碳烷烃优化利用的一个重要反应。

The aim was to investigate the property of H3PW12O40/Al2O3 in the process of preparing pesticide intermediate acrolein.

［目的］研究H3PW12O40/Al2O3在制备农药中间体丙烯醛反应中的性能。

It is concluded that acrolein induces adult mice cardiomyocytes apoptosis, and it may be due to the increased intracellular oxygen free radicals and calcium concentration.

丙烯醛可引起成年小鼠心肌细胞的凋亡，其作用可能是由于细胞内氧自由及钙浓度的增加。

The aim was to investigate the process conditions of preparing the pesticide intermediate acrolein by using biological glycerol.

［目的］考察生物甘油制备农药中间体丙烯醛的工艺条件。

Objective To observe the effect of enalapril on airway inflammation in rat models induced by inhaling acrolein and to explore its mechanism.

目的 应用丙烯醛建立气道炎症模型，给予依拉普利进行干预，了解其对气道炎症的影响，并探讨核因子在这一过程中的作用。

The results show that acrolein appears at the beginning of the reaction, but acrylonitrile appears earlier when the temperature is higher which indicates that the formation of acrylonitrile takes some time.

研究发现，反应开始阶段即有丙烯醛生成，而丙烯腈随反应温度的升高，出现的时间变早，说明丙烯腈的生成需一定的时间。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新