化学合成

The facile methods for selective generation of〓(n= 1, 2, 3) were reported.

系统地研究了〓的还原反应，初步总结了一些还原〓的规律。2、开发了水相化学方法选择性地合成〓(n=l，2，3)负离子。

On the basis of researching catalyst,the isomerization reaction of nerolidol wasinvestigated in detail,and then the optimum technical conditions are selected toprepare farnesol in a higher yield.

同时研究了催化剂——原钒酸酯以及目的产物的物理性质和化学性质，探讨了合成金合欢醇的可能反应机理和可能产物的化学结构，取得了令人满意的结果。

In this dissertation, two derivatives of aniline containing polyoxyethylene substituent m-phenylene diamino formyl alkylenediamine poly acetate and poly-3-aminobenzoate were designed and synthesized. And then, comb-shaped polyaniline grafted by PEO were prepared by chemical oxidation copolymerization. The structure of copolymers were characterized by FTIR, ultraviolet-visible spectrum, elemental analysis and TEM etc..

本文在设计并合成两种含聚氧乙烯取代基的苯胺衍生物——间苯二氨基甲酰己二氨基甲酸聚氧乙烯乙酸酯和3-聚氧化乙烯单甲醚基苯胺的基础上，采用化学氧化法将它们与苯胺进行共聚，制备出了聚氧乙烯接枝聚苯胺的梳型共聚物。

The tribological performance of 2-(N-alkylcarbamoylmethyl)thiobenzothiazole as an additive in liquid paraffin was evaluated by four-ball machine.

利用四球试验机考察了所合成的苯并噻唑衍生物添加剂在基础油中的摩擦学性能，并用X射线光电子能谱仪和扫描电子微探针观察分析了磨斑表面的元素化学状态。

The person also explained that the money voted to build a modern eco-ranch in the production of raw milk and dairy products throughout the entire process will put an end to chemical fertilizers and pesticides, hormones, cattle long regulator, galactagogue agents, food additives and other synthetic chemicals; in the processing, packaging, storage, transport process to ensure the quality of milk products.

该人士还解释说，投巨资打造的现代化生态牧场，在原料奶和乳制品生产的全过程中，将杜绝化肥、农药、激素、牛长调节剂、催奶剂、食品添加剂等人工合成的化学物质；在加工、包装、贮藏、运输过程中保证鲜奶商品质量。

Many natural products with caged scaffold, which isolated from the plants of Garcinia species, are characterized by special chemical structure and interesting bioactivities.

藤黄科植物中含桥环的天然产物具有独特的化学结构和明显的生物活性。综述了近年来这类天然产物的全合成研究进展

The hapten design and synthesis are the key steps for the development immunochemical method of pesiticide residue.

免疫半抗原的分子设计与合成是建立小分子免疫化学分析方法的关键步骤。

Imide derivatives constitute an important class of organic compounds with numerous uses in biology, synthetic and polymer chemistry.

Imide 衍生物在生物合成及聚合物化学方面，有许多重要的用途。

A novel epoxy resin containing imide and naphthyl groups was synthesized to produce heat resistant polymer. The chemical structures were characterized by ~1H-NMR,~(13)C-NMR, FTIR spectra and elemental analyses.

合成了一种新型含萘环和酰亚胺结构的环氧树脂BHPD-EP，其化学结构由~1H-NMR、~(13)C-NMR、FTIR和元素分析进行了表征。

In recent years,the employment of biocatalysts for organic synthesis has become an increasingly attractivealternative to chemical methods.

生物催化剂在有机合成中的应用已经成为一个比化学方法更吸引人的技术。

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