乙酯

Triethyl orthoformate, industry 97 37%; diethyl malonate, industry 98%; acetic anhydride, reagent 97%.

原甲酸三乙酯，工业97 37%；丙二酸二乙酯，工业98%；醋酸酐，试剂97%。

N-(6-methyl-2-pyridine)-amino-methylene-diethyl malonate was produced by condensation reaction of 2-amino-6-methyl pyridine with ethoxymethylene diethyl malonate under optimal conditions that n(2-amino-6-methyl pyridine)∶n(ethoxymethylene diethyl malonate) is 1∶1.3, reacting time 45 min and temperature 130 ℃,the yield of this reaction was 96%,which was 6% higher than that of literature.

在250℃的反应温度下，分别以二苯醚、石蜡油和邻苯二甲酸二乙酯为热载体进行成环反应，得到4-氧-7-甲基-1，8-萘啶-3-羧酸乙酯的收率分别为88.6%、56.3%和61.2%，确定二苯醚为最佳热载体，并发现反应温度对产率的影响最大，原料配比次之，反应时间基本无影响。

When lipase N435 was 2.5gL^(-1), RS-ethyl mandelate was 0.25gL^(-1), water to RS-ethyl mandelate was 5:1, the reaction temperature was 40℃, the speed of agitation was 200rmin^(-1), the R-ethyl mandelate conversion could reach 41.6%, and enantiomeric excess e.

确定了最适的反应条件：脂肪酶N435浓度为2.5gL^(-1)，RS-扁桃酸乙酯浓度为0.25molL^(-1)，水：RS-扁桃酸乙酯的摩尔比为5：1，反应温度为40℃，摇床转速为200rmin^(-1)，反应时间为24h。

Metal/ oxide composite aerogels can be used as catalysts because of their high specific surface area. In this paper, Co-rich Co/SiO2 composite aerogels in which mass fraction of Co can reach 66%were firstly prepared by sol - gel process of Co-containing tetraethyl orthosilicate. The influence of H2O, catalyst, solvent and composition of Co-containing tetraethyl orthosilicate on the sol-gel process are discussed.

本工作首次采用含钴硅酸乙酯进行溶胶～凝胶反应来制备高钴含量的纳米级Co/SiO2复合气凝胶，制备的Co/SiO2复合气凝胶中n：n的比例最高可达2：1，且复合气凝胶中的Co含量可在小于66％的范围内任意调节，并系统研究了水量、催化剂浓度、溶剂量及含钴硅酸乙酯的组成对溶胶-凝胶过程的影响。

The main compounds of essential oils were Pentadecane（20.88%,46.56%）,Ethyl-cinnamate(25.60%,10.94%), Ethyl-p-methoxycinnamate(28.69%,2.41%),3-Carene(3.31%,11.36%).

主要成分均为十五烷（20.88%，46.56%），桂皮酸乙酯(25.60%，10.94%)，对甲氧基桂皮酸乙酯(28.69%，2.41%)，3-蒈烯(3.31%，11.36%)。

Caffeic acid phenethyl ester is a biologically active ingredient of honeybee propolis.

之前对咖啡酸苯乙酯的研究显示咖啡酸苯乙酯是具有抗病毒、抗发炎、抗氧化、放射线治疗的致敏剂等作用的性质。

By the polycondensation of amino acid 5-fluorouracil -1, 3-dipropyl esters with bis (2-chloroethyl) phos- phoramidic dichloride in the presence of 〓 or in vacuo, ten new polymers containing 5- fluorouracil, nitrogen mustard and amino acid were synthesized.

将1，3-双-5-氟尿嘧啶与二氯膦甲酸乙酯或二氯膦乙酸乙酯在DMF中反应制备得到20个三元共聚物，体外抗肿瘤试验表明：含有甘氨酸、缬氨酸、苯丙氨酸和酪氨酸的聚合加显示了一定的选择性，并且分析讨论了生物活性与结构之间的关系。

Influences of initiator,sulphonate,acrylic acid and diethylmaleate on fluidity of cement paste were studied in detailsAddition of diethyl maleate helped to reduce slump loss.

详细研究了引发剂、磺酸盐、丙烯酸和马来酸二乙酯等因素对净浆流动度的影响；马来酸二乙酯的加入，减小了流动度损失。

The lethal effects of ethyl formate on the eggs,early larvae,late larvae,pupae and adults of Tribolium castaneum were systematically studied under laboratory conditions with EtF fumigation with different dosages,treatment duration and temperature.

在不同的药剂浓度、处理时间和温度下系统研究甲酸乙酯对赤拟谷盗T.castaneum卵、低龄幼虫、高龄幼虫、蛹以及成虫的熏蒸致死作用，结果表明处理时间和温度显著影响甲酸乙酯对赤拟谷盗各虫态的熏蒸致死效果。

Methods Triethyl phosphite and ethyl chloroacetate were used as starting materials to synthesize pregabalin by Arbuzov reaction, Wittig-Horner reaction, Michael addition, reduction and resolution.

以亚磷酸三乙酯和氯乙酸乙酯为起始原料，经Arbuzov反应、Wittig-Horner反应、Michael加成、还原、拆分5步反应得到普瑞巴林。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。