取代物

The optimal conditions were found to be with reaction temperature of 40－50 ℃,the ratio of chitosan to citral of 1∶6 and 10 h of reaction time.

最佳条件为：反应物配比n∶n=1∶6，反应温度40～50 ℃，反应时间10 h，壳聚糖席夫碱的缩合率可达86%，取代度为0.82。

Effect of the ratio of chitosan to citral,reaction time and temperature on the yield and the degree of substitution has been investigated.

采用[L9（33）]正交实验探讨了反应时间、反应温度及反应物配比对壳聚糖席夫碱缩合率和取代度的影响。

We have observed gaseous diatomic molecule on the semiconductor surface with the chemical-physics dynamic mechanism of the chemical adsorption on the dangling bond. We explored on the phenomena in how gas molecules dissolve, how the atoms move, and on how they replace the bondings during the chemical adsorption process on the surface.

本论文主要在研究气态双原子分子化学吸附於半导体表面悬键上的化学物里动力学机制，并探讨气体分子在表面化学吸附过程中的分子裂解、原子移动、取代键结等现象。

In addition, a series of double stranded polymers by using furan-containing oligoaryls as linkers was synthesized.

另一方面，我们将连接降冰片烯骨架的基团，以一系列不同共轭长度的苯环呋喃交错寡聚物取代。

Becausethe ginger flavine and its the synonym have many kinds of pharmacologyactiveness, at present, conducted the research take this kind ofcompound as the forerunner which the structure optimized to cause inthe world scope chemist and the medicine scientist's widespreadattention, take the ginger flavine as the raw material, first had thefunction production corresponding sodium salt in the organic solventby NaOH or NaOEt and a-H, then and 卤代烃carried on the substitution reaction, the response condition which theresearch optimized, and grew this derivative monocrystal with thesolution law.

由于姜黄素及其类似物所具有的多种药理活性，目前，以该类化合物为先导进行结构优化的研究引起了世界范围内的化学家和药物学家的广泛关注，以姜黄素为原料，先在有机溶剂中以NaOH或NaOEt与a-H发生作用生成相应钠盐，再和卤代烃进行取代反应，研究优化的反应条件，并用溶液法生长该衍生物单晶体。

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。

At the same time several fused bicyclic heteroatom analogs were synthesized. Some of our Smac mimetics promote apoptosis in cancer cells.

与此同时，我们还合成了一些杂原子取代的并环Smac模拟物并测试其生物活性。

Up to now, there are many reports about complexes of hydrazone and monohydrazidate, while fewer is reported about bihydrazidate and its complexes.

另一方面，含有多个配位原子的N-取代水杨酰肼是一种强螯合剂，是制备多核配合物的理想配体。

Leather hydrolyzate found in milk powder, 2009

2009年，致癌的皮革水解物取代三聚氰胺，成为新的、更毒的、且更难检测的非法添加剂

The synthesis, crystal structure and characterization of 4, 5-dimethyl-2-(2-pyridyl) imidazole were reported.

为了制备研究2-取代咪唑配合物，设计合成了4， 5-二甲基-2-（2-吡啶基）咪唑，用IR、MS、1H-NMR对其结构进行了确证，并对其晶体结构进行了分析。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。