乙酯

Methoxy sec-ethyl acetate, Ethyl acetate, Ethyl forate,α-Pinene,β-Pinene, Camphene, Junipene, Limonene, P-Cymene, Linalool and Terpinole are regarded as the key flavorous components, which result in the peculiar smell and taste in fruits of Rubus L..

综合分析表明，甲氧基次乙基乙酸酯、乙酸乙酯、甲酸乙酯、α-蒎烯、β-蒎烯、莰烯及桧烯、柠檬烯、对伞花烃、芳樟醇、萜品醇类等化合物是四种悬钩子类果实的主要香味成分。

The results showed that new-type solid ferric potassium alum was a good catalyst for the synthesis of ethyl decanoate and the optimum conditions were as follows: molar ratio of acid to alcohol was 1∶2, the use level of catalyst was 0.6 g/0.05 mol capric acid, water-taking reagent benzene was...

结果表明，新型固体酸铁钾矾是合成癸酸乙酯的良好催化剂，在酸醇物质的量比为1∶2，催化剂用量为0.6g(0.05mol癸酸)，带水剂苯为15mL，反应时间为2.5h的条件下，癸酸乙酯的酯化率可达98%。

The results showed that new-type solid ferric potassium alum was a good catalyst for the synthesis of ethyl decanoate and the optimum conditions were as follows: molar ratio of acid to alcohol was 1:2, the use level of catalyst was 0.6g/0.05 mol capric acid, water-taking reagent benzene was 15 mL, reaction time was 2.5 h and the yield of ethyl decanoate could reach 98%.

结果表明，新型固体酸铁钾矾是合成葵酸乙酯的良好催化剂，在酸醇物质的量比为1：2，催化剂用量为0.69（0.05 mol癸酸），带水剂苯为15mL，反应时间为2.5h的条件下，癸酸乙酯的酯化率可达98%。

The results indicated that the use of such membrane could achieve satisfactory separation effects (condensate of high alcoholicity and rich flavoring substances was obtained, membrane-flowing rate: ethanol＞esters except ethyl lactate＞aldehyde＞other alcohol＞water), the membrane had good selectivity to ethanol and ethyl caproate had good membrane-flowing rate and membrane-passing percentage, however, ethyl lactate, aldehyde and methanol had poor mambrane-passing percentage with heavy loss during membrane-passing.

结果表明，渗透汽化膜有良好的分离性能，可得到高酒精度、香味物质富集的冷凝液；过膜速率：乙醇＞酯类＞醛类＞其他醇类＞水；膜对乙醇选择性好，己酸乙酯的过膜率及过膜速率高；乳酸乙酯、醛类及甲醇过膜率较小、损失量较大；渗透汽化膜用于白酒的香气成分分离有良好的工业应用前景。

The process of diethyl carbonate synthesis by transesterification reaction of ethanol with ethylene carbonate,coproducing useful ethylene glycol was investigated using catalyst of sodium ethylate .

研究了以乙醇钠为均相催化剂，碳酸乙烯酯和乙醇酯交换合成碳酸二乙酯同时联产乙二醇的过程。

In order to obtain the thermodynamic data of the synthesis of ethyl methyl carbonate from dimethyl carbonate and diethyl carbonate, the standard molar enthalpies of formation, Gibbs free energy and molar heat capacity under constant pressure are calculated by the method of Benson group contributions.

为了得到碳酸二甲酯和碳酸二乙酯酯交换合成碳酸甲乙酯反应的热力学数据，用Benson基团贡献法计算了相关物质的标准摩尔生成焓、吉布斯自由能和摩尔定压热容。

Methacryloyloxydecyl-2-thiouracil-5-carboxylate was synthesized from the reaction of thiouracil with diethyl ethoxymethylene malonate and ω-hydroxy-decyl-methacrylate.

以硫脲、乙氧基次甲基丙二酸二乙酯和甲基丙烯酸ω-羟癸酯为主要原料合成了一种新的粘接性单体10-甲基丙烯酰氧癸基－2-硫脲嘧啶－5-羧酸酯。

OBJECTIVE:To establish the RP-HPLC method for determination of methyl hydroxybenzoate and ethyl hydroxybenzoate in oral liquid preparations METHODS:The Nova-Park C18 column(3 9mm×150mm,5μm)was used The mobile phase consisted of acetonitrile-water(25∶75)at a flow rate of 1ml/min,the detection wavelength was set at 254nm and the sensitivity was set at 0 01 AUFS RESULTS:The linear ranges of methyl hydroxybenzoate and ethyl hydroxybenzoate were 0 4 412～13 2 360μg/ml(r=0 9 999) and 0 6 672～20 0 160μg/m...

目的 ：建立内服液体制剂中羟苯甲酯和羟苯乙酯的反相高效液相色谱测定方法。方法：色谱柱：Nova -ParkC18 柱(3 9mm×150mm ，5μm)；流动相：乙腈-水(25∶75)；流速：1ml/min ；检测波长：254nm ；灵敏度：0 01AUFS。结果：羟苯甲酯浓度在0 4412～13 2360μg/ml范围内线性关系良好(r=0 9999)；羟苯乙酯浓度在0 6672～20 0160μg/ml范围内线性关系良好(r=0 9998)。结论：该方法简便、快速、准确，可用于医院制剂中防腐剂的检测。

The asymmetric reduction of prochiral P-oxo ester, aromatic ketone and aliphatic ketone to its corresponding chiral alcohol by yeast cells were studied respectively in this work when ethyl 4-chloro-3-oxobutyrate, acetophenone and 2-octanone were as the model substrates.

本文以4-氯乙酰乙酸乙酯、苯乙酮和2-辛酮分别为β-羰基酯、芳香酮和脂肪酮的模型底物，研究了利用活性酵母细胞催化这三类前手性酮不对称还原合成相应手性醇的反应特性。

Chloromethyl-4-hydroxyl-7-methyl-6,7-dihydrothiopheno pyrimidine,2-chloromethyl-4-methoxyl-7-methyl-6,7-dihydrothiopheno pyrimidine have been synthesized by the reaction of chloroacetamidine hydrochcoride 2-ethoxycarbonyl-4-methyl-tetrahydrothiophen-3-one and dimethyl sulphate in this paper.

以甲基丙烯酸乙酯、巯基乙酸乙酯和氯乙腈为原料高产率地合成了两种新型导电高分子单体化合物，并通过核磁氢谱、核磁碳谱、质谱等确定了它们的结构。

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。