查询词典 esters

Thus,α,β-unsaturated ketones were prepared by base-catalized aldol condensation between substituted arylaldehydes and acetones. Using iodosobenzene diacetate as oxidants, the resulting α,β-unsaturated ketones will be transformed to β,γ-unsaturated carboxylic acid esters.

以不同取代的芳香醛跟丙酮缩合后可以得到α，β-不饱和酮，再用iodosobenzene diacetate做氧化剂氧化，可以成左卤o到β，γ-不饱和碳酸酯类化合物。

The synthesis of eight compounds ( borneol ester and isoborneol ester) and other esters catalyzed by nanometer solid superacids were also researched. In addition, we still analyzed the distinction of esterification yield of borneol ester and isoborneol ester. The particle size, surface area, changes of profile and acidity of nanometer solid superacids were mensurated and analyzed by TEM, BET, XRD, IR and acid indicator.

对纳米固体超强酸催化合成系列正、异冰片酯及其它酯的反应作了一定的研究，论文分析了正、异冰片酯化反应的差异，并用TEM、BET、XRD、IR及酸标指示剂等方法和手段对纳米固体超强酸的粒度、比表而积、形貌变化及其酸性大小进行了分析和测定，通过IR、~1H NMR、~？

At present, the main operators of chemical species have: propionaldehyde, n-butanol, isobutanol, octanol, isobutyraldehyde, acrylic esters, such as n-butyraldehyde .

目前主要经营的化学品种有：丙醛，正丁醇，异丁醇，辛醇，异丁醛，丙烯酸酯，正丁醛等。

Solubilities were determinated for natural vitamin E and fatty acid esters under isothermal,isobaric and isochoric conditions at 40-60 ℃ and 9-17 MPa based on soybean deodorizer pretreatment,their relative separation factors were also measured.

以大豆油脱臭馏出物预处理产物为原料，在温度40—60℃、压力9—17 MPa范围内等温、等压和等密度3种条件下分别测定了预处理产物中天然维生素E和脂肪酸甲酯在超临界CO2中的溶解度，并计算了它们之间的相对分离因子。

A series of novel aromatic amide molecular tweezers with different chiral centers and cavities were designed and synthesized by using isophthalic acid as the spacer to bridge the different L-amino acid methyl esters under microwave irradiation.

以间苯二甲酸为隔离基，酰胺键桥联L-氨基酸甲酯构成手臂，在微波辐射下合成了具有不同手性中心和裂穴的新型手性芳酰胺类分子钳。

In addition, the nozzle structure is complex and there are some parts of the factory of the nozzle is sealed with adhesive, glue is organic, most of the glue is impatient keto esters and organic solvents, alcohols, of course, including the nozzles on the sealant.

另外，喷头的结构很复杂，出厂的喷头有一些部位是用胶粘剂密封的，胶是有机物，大部分的胶是不耐酮酯醇类有机溶剂的，当然也包括喷头上的密封胶。

The nonionic surfactant is selected from the group consisting of a polymeric ether, a mixture of laurate esters of sorbitol and sorbital anhydrides condensed with ethylene oxide; and mixtures thereof.

所述非离子型表面活性剂选自聚合醚；与环氧乙烷缩合的山梨醇月桂基酯和山梨醇酐的混合物；它们的混合物。

According to analysis of coconut oil which contains special ingredients, and that the content is as high as 50% of the fatty acids - lauric acid, in addition to a large number of glycerin - Gui esters.

据分析这与椰子油含有特殊的成分有关，即含量高达50％的脂肪酸-月桂酸，此外还有大量的甘油-桂酸酯。

The result indicates that every 20 gram Lithospermum erythrorhizon oil can eventually produce 10 2 gram methyl esters of fatty acids and the weight perce...

实验结果表明：每 2 0g紫草油最终可得不饱和脂肪酸甲酯 10 2g ，其中w =83 1%。

Based on the different reaction results with-menthyl,-8-(2-naphthyl)menthyl or-8-phenylmenthyl as the chiral auxiliary, it is was proposed that the possible p -stacking effect between the aryl of chiral auxiliary and dienyl group of α,β-unsaturated esters is involved in the diastereoselectivity of these reactions.

该反应手性辅基易于回收、选择性好，产率高，这一工作为合成多取代的光学活性乙烯基环丙烷衍生物的提供了一种较为简便的方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。