查询词典 synthesis

Latest researches in the catalysts for synthesis of carbamate by ammonolysis of dimethyl carbonate;2. Progress in the catalysts for synthesis of carbamates by ammonolysis of dimethyl carbonate;3.4,4′-Methylene diphenyl carbamatewas synthesized by ammonolysis of dimethyl carbonate, a substitute of phosgene, and 4,4′-diaminodiphenyl methane with anhydrous zinc acetate as catalyst.

用碳酸二甲酯代替光气，以4，4′-二氨基二苯基甲烷为原料，在无水醋酸锌催化剂的作用下，经胺解反应合成了4，4′-二苯甲烷二氨基甲酸甲酯；测定了MDC的熔点；采用傅里叶变换红外光谱和氢核磁共振对产品结构进行了表征；考察了反应温度、DMC用量、反应压力、反应时间、催化剂用量对MDC收率的影响。

Then we completed the first total synthesis of-Plakoridine A using Eschenmoser couping reaction as akey step. During the synthesis we found the choice of protecting groups and the configuration of the chiralcenter of the substrate play an important role to the key Eschenmoser reaction,so we think our successwould be of guide for synthesizing other polysubstituted pyrrolidines or piperidines.

在论文的第一章中，我们先以易得的对羟基苯乙酸乙酯为原料经多步反应制得了所需的β氨基酸酯，然后利用立体选择性的Aldol缩合反应和内酰胺化反应制得了Plakoridine Alactam，随后，以Eshenmoser缩合反应为关键步骤完成了生物碱-Plakoridine A的首次不对称全合成。

Pulse width modulation is also exploited in sound synthesis, especially subtractive synthesis, as the process gives a chorus effect or that of slightly detuned oscillators played together.

脉宽调制也是利用声音合成，尤其是减法合成，随着这一进程提供了合唱效果还是略失谐振荡器共同出战。

Processes using composite materials in accordance with the invention are, for example, used for production of synthesis gas comprising carbon monoxide and molecular hydrogen which synthesis gas is, advantageously, free of deleterious and/or inert gaseous diluents such as nitrogen.

应用按照本发明的复合材料的工艺是，例如，生产包括一氧化碳和分子态氢的合成气，其中合成气的优点是没有有害和／或惰性气体如氮气的稀释。

Enantiopure epoxides are versatile chiral building-blocks in organic synthesis and can be used for convenient synthesis of many bioactive compounds.

手性环氧化物是有机合成中非常重要的手性合成砌块，可以方便地合成许多有生物活性的手性化合物，因而在手性合成和医药工业上具有极其重要的应用价值。

The synthesis of ethambutol hydrochloride used as an antituberculosis agent, was studied systematically in this paper, including the synthesis and resolution of-2-aminobutanol, racemization of-2-aminobutanol and the recovery of L--tartaric acid.

本文对抗结核药物盐酸乙胺丁醇的合成进行了系统地研究，包括原料-2-氨基丁醇的合成、拆分，-2-氨基丁醇的消旋以及L--酒石酸的回收。

The synthesis method of calixcrown ethers was simplified and improved, and 10 Lscale synthesis was carried out.

对杯芳烃冠醚的合成工艺进行了简化和改进，并进行了10L规模的中间放大合成。

With the 9,9-bisfluorene , we developed new methods to synthesis of ethers. Different synthesis methods are compared.

对9，9-双芴再进行甲基化反应，提供了合成醚类给电子体的方法，详细比较了各种方法的差异。

Data from field are used to train synthesis models. The results verify that synthesis-based load modeling can surmount the difficulties such as the variation of load characteristics due to ...

建模实践表明：负荷动特性综合对于解决目前负荷动特性建模中存在的问题，建立适用于仿真计算的负荷模型有着非常重要的作用。

Based on the property and performance requirement of hydraulic simulator, the identification results of nominal models and their uncertainty bounds of single channel systems in inner and outer gimbals as well as the flexible and systematic robust controller design frame provided byμ-synthesis, the robust feedback controllers withμ-synthesis are designed for single channel systems in hydraulic simulator's inner and outer gimbals.

根据液压仿真转台的特性和性能要求，结合内、外框单通道系统名义模型及不确定性界的辨识结果，利用H∞控制理论中的μ综合法能够提供灵活的和系统化的鲁棒控制器设计构架的特点，对液压仿真转台内、外框单通道系统进行了μ综合法鲁棒反馈控制设计。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失