查询词典 cyanoacetic

The synthesis of 4,5,7-trichloroquinoline makes use of ethyl orthoformate, cyanoacetic ester and 3,5-dichloroaniline as the raw materials. The synthesis is completed by four steps: condensation, cyclization, hydrolyzation and chlorination. Several conditions concerned in the process are studied, the whole yield of 4,5,7-trichloroquinoline is about 53%, and the purity of it is about 96%. All the products are testified by IR, NMR and HPLC.

介绍了以3，5-二氯苯胺、原甲酸三乙酯和氰乙酸乙酯为原料，经过缩合、成环、水解和氯代4步反应制备4，5，7-三氯喹啉的方法，对相关的试验条件进行了考察，通过红外光谱、核磁共振谱和液相色谱对4，5，7-三氯喹啉的结构和纯度进行表征和测定，试验结果为4，5，7-三氯喹啉的纯度大于96%，总收率达到53%。

Was synthesized from cyanoacetic acid and diethylamine via DCC coupling under mild conditions.

中间体5 的制备由氰基乙酸在二环己基碳二亚胺作用下经酰胺化一步制得，条件温和，收率较高，避免使用剧毒的氰化钠。

In the second approach, terephthalaldehyde was also used as starting material, which reacted with cyanoacetic acid in pyridine to afford tetra-nitrile compound.

在第二种合成路线中，我们仍然以对苯二甲醛为起始原料，对苯二甲醛与氰基乙酸反应得到四氰基化合物8，再经过官能团转换、还原、亲核取代、分子内Friedel-Crafts反应得到中间体H〓TTPR。

Two synthetic routes of Caffeine have been determined and investigated after the analyzing and trying for the literal synthetic methods. In one route, the target compound was prepared from chloroacetyl chloride through six steps, the total yield is 50.5 %. In another route, the target compound was obtained from cyanoacetic acid through six steps, the total yield is 45%.

对目前咖啡因工业生产工艺进行了研究，并分析了咖啡因工业生产中所存在的问题，本文提出两条可行的工业化合成路线：一条是以氯乙酰氯为起始原料，经过六步反应制得目标化合物，总收率50.5％；另一条是以氰基乙酸为起始原料经过六步反应制得目标化合物，总收率45％。

The latest results about research on dye-sensitized solar cells are reviewed.So far,most of the organic dyes applied in DSSCs belong to typical D-π-A structures with both electron donorand electron acceptorlinked by aπ-conjugation bridge.According to this structure,the novel conjugated organic dyes that have N,N-dimethylanilinemoieties as the electron donor and a cyanoacetic acidmoiety as the electron acceptor were synthesized for DSSCs.

在第四章中首先概述了染料敏化太阳能电池的最新研究进展，并对其的结构和工作基本原理进行介绍，目前，有机染料分子大部分都是D-π-A结构，我们按照这样的结构设计和合成出六种新型米氏酮-氰基类有机染料分子，该类染料是由米氏酮衍生而来的，合成步骤短，工艺简单。

What would he tell Judith and the children?

他将怎样告诉朱迪丝和孩子们呢？

I this is at that time, the opinion with peacockish true girl is full of in a heart.

这就是当时的我，一个心中布满虚荣的女孩子真实的想法。