查询词典 carboxylic

Similarly, IVB〓 reacted with carboxylic acids in DCC/DMAP/DCM system to produce ten new 5-IVB〓 esters in 66-82% yield. AVB〓 or IVB〓 also reacted with carbamino chloride or phosphoryl chloride in IM/DMAP system to produce eight corresponding carbamates or phosphorylates in good yields.

阿维菌素B〓与氨基甲酰氯反应，合成了2个5-AVB〓氨基甲酸酯衍生物：阿维菌素B〓与膦酰氯反应，合成2个5-AVB〓膦酸酯衍生物；并改进了阿维菌素与酰氯的反应条件，缩短了反应时间，提高了产率和反应的选择性。

It bas been discovered that the carboxylic ester rare earth salt is superior to the organotin in antidehydrochlorination, and inferior to the organotin in antioxidation through following the tracks of carboxide group and conjugated double bond with the help of infrared spectroscopy and ultraviolet-visible spectroscopy.

借助于红外光谱和紫外／可见光谱，通过跟踪光老化过程中羰基基团和共轭双键的变化，发现羧酸酯稀土的抗脱HCl能力优于有机锡，但抗氧化能力不如有机锡。

Many natural resins exist which contain carboxylic acid such as carboxy celluloses and proteins containing glutamic acid.

许多天然树脂存在，包含如羧基纤维素和蛋白质，含有谷氨酸羧酸。

Many carboxylic acids are of biochemical importance.

许多羧酸具有重要的生物化学作用。

The physical and chemical properties of carboxylic acids are molecules that exist in a variety of chemical groups in the overall performance.

羧酸的物理和化学性质是分子中存在的各种化学基团的总表现。

The carboxylic in unknown samples was dc. termined by this method with good results.

用本法对未知氧化度样品的羧基含量进行测定，得到了较好的结果。

They are therefore both carboxylic acids and amines.

因此，它们既是羧酸又是胺。

It can swell in water easily and can complex with polyphenol carboxylic acids and other low molecular weight compounds.

在水中易膨胀并能与多酚，羧酸及其它低分子量化合物质络合。

This did not go through four sides intermediatesby dehydrating between carboxylic and alcohol.

而不是经历了通常的羧酸与醇直接脱水形成酯的四面体中间物的过程。

The method of directly oxidizing the hydroxymethyl to carboxylic group is named one-step process.

并分别讨论了几种方法的优缺点、催化剂的选择及其适用的反应条件。

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。