查询词典 carboxylic

The structure, character, synthetic method and the applied range of synthetic perfume, such as hydrocarbon, alcohol, aldehyde, ketone, carboxylic acid, ester, lactone, organic nitrile, nitro compound and heteroatomic ring compounds are comprehend.

理解烃、醇、醚、酸、酯、杂环及芳香类香料的结构、性质、合成方法和应用范围。

In chapter five, we synthesized star-shaped {C}_3-oligofluorenes end-capped with one, two, three carboxylic groups, respectively.

第五章，我们合成了一系列的端基分别为一、二、三个羧酸的星状寡聚芴。

Master the Keto-Enol tautomerism; reactions of enols:α-H substitution reactions;α-halogenation of aldehydes and ketones;α-bromination of carboxylic acids; acidity ofα-H atoms: enolate ion formation; reactivity of enolate ions; alkylation of enolate ions; mechanism of carbonyl condensation reactions;condensations of aldehydes and ketones: the Aldol reaction; dehydration of Aldol products; the Claisen condensation reaction; the Michael addition.

熟练掌握酮式－烯醇式互变异构；烯醇的反应：α-H的活性；醛酮的α卤代反应；羧酸的α-溴代反应；α-H的酸性：烯醇负离子的形成；烯醇负离子的反应；烯醇负离子的烃基化；羰基化合物的缩合反应机理；醛酮的缩合反应－Aldol缩合；Aldol缩合产物的脱水反应； Cleisen 酯缩合反应；麦克尔加成反应。

These results suggest that desorption of PEO segments and their entanglement are hindered due to the formation of hydrogen-bonding complexation between the undissociated carboxylic groups and the PEO chains.

这些结果表明由于未电离的羧酸根基团和PEO链形成了氢键，阻碍了压缩过程中PEO链节的解吸附和链节间的缠结。

Maleic rosin has been added to the surface of wood flour in the form of monoester, i.e., the formation of esterified wood flour bearing a pendent carboxylic group. The rheological study showed that the complex viscosity η(superscript *, storage modulus and loss modulus of WF-HDPE composites decreased firstly and increased afterward and declined lastly as the dosage of maleic rosin increased, however, the viscosity of the composite melts decreased as a whole. After the modification of wood flour, the rheological properties of composite melts were improved markedly. According to the mechanical test it was indicated that, by proper treatment of wood flour with maleic rosin, the tensile strength and flexural strength of WF-HDPE increased obviously.

WF-HDPE流变学研究表明：复合材料的复合黏度η(上标*、储能模量和损耗模量随马来松香用量的增加先减小后增大最后减小，但体系的黏度和模量总体呈下降趋势，木粉经马来松香改性后复合熔体的流变性能显著改善，这不仅有利于提高复合材料的成型加工效率，而且适当的马来松香处理也能够提高复合材料的拉伸强度和弯曲强度，后者被静态力学试验结果所证实。

" Oxalic acid: Colourless, crystalline, toxic carboxylic acid found in many plants, especially rhubarb, wood sorrel, and spinach."

草酸：无色结晶有毒的羧酸类有机化合物。许多植物中有草酸，尤其是大黄、酢浆草和菠菜。

Dichlo-5- carboxylic acid Rhodamine is a kind of bright flurescent using xanthene as scaffold, whose aryl-H was substituted with a variety of groups. Compared with any other rhodamine, they can increase or decrese emissive absorbance in most limitation.

4，7，-二氯-5(和6)-羧酸罗丹明荧光染料是一种带有羧基官能团的荧光染料，作为一种特殊的抗体染色剂，在生物，医药方面具有广泛的应用，能标记DNA和蛋白质等大分子，这些性能被广泛应用于DNA分离和定序的研究中。

Acylamino compounds from AD were synthesized by cleavage of A-ring through NaIO4/KMnO4 oxidation, ring closure by amination, oximation with hydroxylaminechloride in C-17 position, and reduction of oxime in C-17 position and substitution with substituted acylchloride and carboxylic acids.

本文以AD为起始原料，经过NaIO4/KMnO4氧化裂解、胺解环合、羟氨肟化反应，在甾体17位形成肟，并将肟还原成胺，与取代酰氯和有机羧酸反应，合成了15个酰胺化合物。

Aromatic and aliphatic aldoxime s could be efficiently converted into the corresponding carboxylic acid esters by treatment aldoxime s with an alcoholic solution of 30% hydrogen peroxide in the presence of catalytic amounts of polystyrene-bound phenylseleninic acid.

在30%双氧水和醇组成体系中，聚合物负载的苯亚硒酸试剂可有效地促进过氧化氢氧化肟转变成羧酸酯；相应伯醇和仲醇的羧酸酯的产率中等到良好，但在含叔醇的体系中没有相应的羧酸酯生成。

The particle size, morphology, distribution of carboxylic group and alkalic thickening nature were investigated.

在聚合物链中导入羧基，可明显地改善胶乳的稳定性、流变性、粘接强度等性能。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。