化合物

Oxo ketene dithioacetals are a kind of versatile intermediates in organicsynthesis. It can be widely used in forming aromatic and heterocyclic compounds.

α-羰基二硫缩烯酮类化合物是一类重要的有机合成中间体，广泛应用于芳环和杂环化合物的合成中。

Hydroxyl ketene dithioacetals were treated under diversely catalyzed conditions, and a wide range of significant compounds and synthetic precursors thus were obtained.

羟基二硫缩烯酮类化合物可以通过各种不同的反应条件进行多种转化，能够获得许多有意义的化合物和合成潜体。

In the end, a Novel and facile method has been used to synthesize functionalized cyclopentadienes by Nazarov cyclization ofα-alkenoyl ketene dithioacetals under Vilsmeier conditions.

从合成的α-烯酰基二硫缩烯酮类化合物出发，经过Vilsmeier试剂作用下的Nazarov环合反应，合成了官能化环戊二烯类化合物。

The synthetic application of bromodifluoromethyl phenyl ketone was studied in this dissertation. It consists of two chapters.

中文摘要本论文对溴二氟苯乙酮在含氟化合物合成中的一些应用进行了探索，共分为两个部分：第一部分考察了溴二氟苯乙酮与羰基化合物的反应。

The different flavonoid is Kudzu root＇s main plant compound.

异黄酮类化合物是葛根的主要的植物化合物。

Theoretical studies on synthetic process of lactide were carried out with density functional theory and the geometries of compounds maybe to appear in reactive system were optimized.

采用密度泛函方法研究了丙交酯的合成过程，优化了合成过程中可能出现的化合物的几何构型，分析了各化合物的振动频率和偶极矩。

A preferred form of the invention is a process comprising adding to a quantity of sodium which is covered with a hydrocarbon solvent boiling above 100°C., at least a chemically equivalent proportion of methyl, ethyl or a propyl alcohol, subsequently adding an approximately equivalent proportion of a dialkyl carbonate and of an alkyl phenylacetate, the alkyl groups in these two last-mentioned compounds being preferably the same as the alkyl radical of the above-mentioned lower aliphatic alcohol, heating the mixture to induce reaction and continually distilling out the alcohol formed from the reaction zone.

本发明的理想形式包括下面的工艺过程：把至少处于化学平衡的甲醇，乙醇或丙醇添加到覆盖着沸点超过一百摄氏度的碳氢化合物溶剂中，接着加入大约相同当量的二烷基碳酸酯和烷基乙酸苯酯，在刚才提到的化合物中，其烷基集团最好是和刚才提到的低级别脂肪族醇相同，然后加热反应混合物从而引导反应的进行，在反应区域通过连续蒸馏移除形成的醇类。

Process for the manufacture of a dialkylphenylethylmalonatewhich comprises adding to a quantity of sodium which is covered with a hydrocarbon solvent boiling above 100°C, at least a chemically equivalent proportion of methyl, ethyl or a propyl alcohol, subsequently adding an approximately equivalent proportion of a dialkylcarbonate and of an alkyl phenylacetate, the alkyl groups in these two last-mentioned compounds being preferably the same as the alkyl radical of the above –mentioned lower aliphatic alcohol, heating the mixture to induce reaction and continually distilling out the alcohol formed from the reaction zone and finally causing the sodio diethyl phenylmalonate so formed to interact with an ethylating agent.

生产二烷基苯基丙二酸酯的工艺过程：这包括这包括把至少处于化学平衡的甲醇，乙醇或丙醇添加到覆盖着沸点超过一百摄氏度的碳氢化合物溶剂中，接着加入大约相同当量的二烷基碳酸酯和烷基乙酸苯酯，在刚才提到的化合物中，其烷基集团最好是和刚才提到的低级别脂肪族醇相同，然后加热反应混合物从而引导反应的进行，在反应区域通过连续蒸馏移除形成的醇类。最后使所形成的钠代二乙基苯基丙二酸酯和乙基化试剂反应。

Late-afternoon carb cravings are also quite normal, Wurtman says, and don't necessarily signal depression."The reason we want to self-medicate with carbs late in the afternoon is not just that life is difficult and filled with frustration, but that it is a normal day-night cycle."

在傍晚感到碳水化合物渴望也是很正常的，Wurtman说道，这并不意味着抑郁，"我们在傍晚食用碳水化合物的原因是用以自我治疗，并非因为生活艰难或生活充满了挫折，那只是普通的日夜循环而已。"

Some of them are expected to become a potential drug for treating leucocythemia.

该化合物及其类似物有延缓肿瘤生长的作用，某些化合物可望成为治疗白血病的潜在性药物

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。