乙酯基

Thiobarbituric acid was synthesized by sulfourea and diethyl malonate in sodium alcohol and 5-Arylidene thiobarbituric acid was prepared by the Knoevenagel condensation reaction from benzaldehyde and thiobarbituric acid.

采用丙二酸二乙酯和硫脲在乙醇钠存在下合成了硫代巴比妥酸，再分别采用固相反应和水相反应，由硫代巴比妥酸和苯甲醛经Knoevenagel缩合反应，制备了5-亚苄基硫代巴比妥酸。

A strain NK13 was screened for a certain extent asymmetric hydrolyze the rac-ketoprofen Chloroethyl ester and identified as Bacillus megaterium. For the preparation of gene libraries, a positive clones was obtained from the tributyrin flat. The sequence of this esterase gene had been analysised, and contained the whole ORF of an esterase gene with the length of 933bp.

以本实验室筛选出的一株具有不对称拆分消旋酮基布洛芬氯乙酯的菌株NK13为材料，经初步鉴定为巨大芽孢杆菌，通过构建其基因文库，从中筛选得到一阳性克隆重组子pUC-NK。

The solubility of the novel polyamides are greatly improved compared with the conventional aramids, especially the polyamide with dendritic blocks of the second genernation as side chains are soluble in most of the common organic solvents such as ether, ethyl acetate, chloroform, acetone, tetrahydrafuran etc.

树状片段的引入大大地改善了聚酰胺的溶解性，特别是以第二代树状片段为侧基的聚酰胺的溶解性得到了很大的改进，可以溶于大部分常见的有机溶剂，如乙醚、乙酸乙酯、氯仿、丙酮、四氢呋喃等。

DPPH method, pyrogallol method and Fenton reaction were used to study the scavenging ability of extracts with 95% ethanol, ethyl acetate, acetone, acetic acid, chloroform, methanol to free radical activity.

方法］应用DPPH法、邻苯三酚自氧化法和Fenton反应分别研究了浓度95%乙醇、乙酸乙酯、丙酮、乙酸、氯仿、甲醇提取物清除自由基活性的能力。

A novel method for synthesis of-4-cyano-3-hydroxybutyric acid ethyl ester (1), a key intermediate of statins, was reported.

研究了一条新的路线用于他汀类药物的重要中间体-4-氰基-3-羟基丁酸乙酯的合成。

Objective: To synthesize 2-benzyloxy-5-fluoro-4-oxo-pyrimidine-3-butyric acid ethyl ester, the key intermediate in the synthesis of fluorouracil derivatives.

目的：合成氟尿嘧啶类衍生物合成中的关键中间体2-苄氧基－5-氟－4-嘧啶酮－3-丁酸乙酯。

One compound is identified as the title compound 2-benzyloxy-5-fluoro-4-oxo-pyrimidine-3-butyric acid ethyl ester, and the other one is its formula isomer.

通过IR谱确证一个化合物是目标物2-苄氧基－5-氟－4-嘧啶酮－3-丁酸乙酯，另一化合物是它的同分异构体。

Objective: To investigate the feasibility of the synthesis of Ethyl-p-Nitrobenzoate catalysed by Hydrogen Peroxide. We study the effects of the actor mole ratio, catalyst dosage, reaction temperature, and reation time on the esterification rate.

目的：探讨双氧水催化合成对硝基苯甲酸乙酯的可行性，并考察了反应物的摩尔比、催化剂用量、反应温度及反应时间对产物收率的影响。

In this thermodynamic study, the minimum requirements in molar fraction of the solvents (x3) on the azeotropic feed plate are: 0.20 for N,N-dimethylformamide, 0.36 for 2-ethoxyethanol, 0.40 for 1-pentanol and 0.66 for butyl propionate,.

在这个热力学研究中，共沸混合物喂料盘上各溶剂摩尔分数最小值(x3)分别是：N，N-二甲基甲酰胺：0.20；2-乙氧基乙醇：0.36；1-戊醇：0.40；丙酸丁酯：0.66。

A new polyelectrolyte complex was synthesized from quaternary salt of poly(N,N-dimethyamino ethyl methacrylate) and metanil yellow in water.

运用聚甲基丙烯酸二甲胺基乙酯的季胺盐在水溶液中与酸性金黄进行了组装，并制得相应的组装产物。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。