酯

The hexyl acetate was synthesized from n-hexanol and acetic acid by direct esterification.

以乙酸、正己醇为原料，直接酯化合成乙酸己酯，分别研究了反应温度、反应时间、原料配比、带水剂、催化剂用量等条件对合成反应的影响，确定了最佳工艺条件。

The preparation of heat stabilizer with 2-Ethyl Hexyl Thioglyclloate and di-n-octyltin dichloride or di-n-octyltin oxide.

摘 要：以自制的二正辛基氧化锡和巯基乙酸异辛酯为原料，采用四种合成双巯基乙酸异辛酯二正辛基锡的方法。

In our paper,1-hexylcarbamoyl-5-fluorouracils and1-cyclohexyl-carbamoyl-5-fluorouracils were prepared through 5-fluorouracil reacting with hexyl isocyanate or cyclohexyl isocyanate by using dimethylaminopyridine as the catalyst.

以5-氟尿嘧啶(5-FU)、正己基异氰酸酯和环己基异氰酸酯为原料，在N，N-二甲氨基吡啶的催化下，通过N-脲化反应制成1-己基氨基甲酰基-5-氟尿嘧啶及1-环己基氨基甲酰基-5-氟尿嘧啶。

The major volatiles of Sansa were E-3-Hexen-1-ol (14.74%), Formic acid and hexyl ester (9.52%) and they were all more than that in other varieties relatively. The major volatiles of Red Chief Delicious were 4-methyl-1, 3-pentadiene (16.37%) and Z-3-Hexen-1-ol, acetate (10.27%) and were also more than that in other varieties.

珊夏枝条挥发物主要成分（E-3-己烯－1-醇、甲酸己酯）的相对含量(14.74%，9.52%)均多于其他品种；首红枝条挥发物主要成分（4-甲基－1，3-戊二烯、乙酸叶醇酯）的相对含量(16.37%，10.27%)均多于其他品种。

The experimental result showed that three byproducts was formed and the optimal condition was as follows: the molar ratio of ethylene glycol, hydrogen bromide, and acetic acid was 1:1:1.3, when ethylene glycol was 1 mol, refluxed 5 h under the action of 100 mL toluene.

结果表明：较适宜的合成条件为乙二醇1 mol， n：n：n=1：1：1.3，在带水剂甲苯(100 mL)的作用下，回流反应5 h，约4 h后分两次追加0.12×2 mol醋酸酐，合成效果最好，产率可达到95%，反应副产2-溴乙醇及少量的1， 2-二溴乙烷、乙二醇二乙酸酯和二乙二醇二乙酸酯。

The alcohol is used as medium to generate hydrolyzate of ethyl silicate in traditional ceramicmold casting process.

传统的水解工艺是采用酒精作为中间媒介来促使硅酸乙酯与水的接触，进而发生水解反应，生产硅酸乙酯水解液。

Synthesis of ethyl lactate is studied by using imidazole ionic liquid as catalyst and ethyl acetate as water-stripping agent.

以酸性咪唑离子液体为催化剂，乙酸乙酯为带水剂研究了乳酸乙酯的合成。

On the basis of this, 1,3-dipolar cycloaddition reactions were studied using imine esters as the starting marerials.

本论文使用不同类型芳香醛与氨基酸酯的加成反应合成了一系列氨基酸酯亚胺类化合物。

Before degradation: limpid stereo reticular structure of PLGA; One week after degradation: PLGA was corroded and the reticular structure was decreased; Three weeks after degradation: airspace was gradually disappeared and the reticular structure was further decreased; Five weeks after degradation: airspace and the reticular structure were completely damaged, which was in an indefinite form.

降解前PLGA(丙交酯和乙交酯的摩尔比为90∶10)支架材料呈清晰的三维立体网状空隙结构；降解1周后，材料表面受侵蚀，网状结构减少，孔洞局灶性连接呈片状；3周时材料表面受侵蚀现象加重，空隙逐渐消失，网状结构进一步减少，聚合物融合呈大片状；5周后材料空隙、网状结构完全消失，呈不定型均质状。

Monitor the changes of cortisol and blood glucose at four points: before the anesthesia; just after the intubations and incision; at the time of suture.

45例择期手术的患者随机分为三组，每组15例：Ⅰ组为对照组，不使用依托咪酯；Ⅱ组为依托咪酯持续静推组，Ⅲ组为依

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。