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Study on Surface Enhanced Raman Scattering of Piperidine;2. Using piperidine as catalyst and ethanol as solvent, a series of new 2-amino-3-cyano-4-aryl-6-methoxy-1,4,9,10-tetrahydronaphtho[2,1-b]pyran derivatives were synthesized by one-pot reaction of aromatic aldehydes, malononitrile and 7-methoxy-1,2,3,4-tetrahydronaphthalen-2-one at room temperature in good yields.

以芳醛、丙二腈和 7 甲氧基 1，2 ，3 ，4 四氢萘 2 酮为原料，在六氢吡啶催化下以乙醇为溶剂，在室温合成了一系列新的 2 氨基 3 氰基 4 芳基 6 甲氧基 1，4，9，10 四氢萘并 [2 ，1 b]吡喃衍生物，反应条件温和，产率较高，并通过IR ，1HNMR和元素分析表征产物的结构，还通过单晶X射线衍射分析确证产物的构

Two bridged substituted styryl pyrazine derivatives have been synthesized in this work.

本工作合成了两种旋转受阻取代的苯乙烯基吡嗪衍生物。

Pyrazine derivatives have been synthesized. And the 3-keto glycosides can be employed to asymmetric synthesis.

并利用两种邻苯二胺与2-位氧化α-甲基D-葡萄糖苷反应合成了两种含糖吡嗪衍生物。

In addition, two D-π-A alternative copolymers, P and P with thieno[3,4b]pyrazine in the backbone, were synthesized by Wittig-Horner polycondensation and applied in mecury detection.

此外，本论文还合成了两种含噻吡嗪单元的D-π-A结构的聚合物，作为荧光传感器敏感材料应用于汞离子检测。

In addtion, a feasible study has been done on the application of molecular distillation to purifying piperonyl butoxide ,a synergist for pyrethrin, synthesized from safrole oil.

并利用短程蒸馏技术对从由黄樟油合成的混合物中分离提纯胡椒基丁醚进行研究。

On the other hand, 3(2)-fluoro-4-methoxyl methyl benzyl alcohol and 3(2)-fluoro-4-methyl benzyl alcohol are mixture and components of pyrethrum esters. Both of them have "mixture fluorine effect " and higher activity, lower drug resistance. As we know, the mixture benzyl alcohol containing fluorine is more easy to be synthesized than the single, so the cost of preparation is lower. We hope to apply it to molecule design of the new agriculture chemical. On the base of molecule design and structure-activity relationship research of pyrethric acid II and mixture of alcohol containing fluorine, we intend to get new pyrethrum ester that have higher activity and lower resistance.

另一方面，混合含氟对甲氧甲基苄醇和混合含氟对甲苄醇都是具有"混合氟效应"的高活性、低抗性的拟除虫菊酯醇组分，由于混合含氟醇的合成要比单一异构体的合成容易，成本较低，本文希望将其应用到新农药的分子设计中，用第二菊酸和一些含氟醇进行分子设计及进一步的构效关系的研究，筛选出一些高活性低抗性的拟除虫菊酯换代新品种。

In the second chapter, a series of pyridine derivatives are synthesized.

第二章，吡啶类衍生物的合成和表征，共合成了25种化合物，其中目标产物15种。

A new functional surfactant with pyridine group has been synthesized.

合成了带有吡啶基团的功能表面活性剂。

A new pyrimidine compound can be synthesized with four steps reaction.

通过4步反应，合成了一种新型嘧啶类化合物。

Four new types of pyrimidine derivatives introduced directly by nitrogen-containing benzoheterocycles were designed and synthesized.

设计并合成了四种苯并含氮杂环取代的嘧啶类新化合物，它们的结构经 MS，IR和1 H NMR分析得到确

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