乙酯

Various reaction parameters such as ratio of ethyl acetoacetate to ethylene glycol,catalyst amount,reaction time and water-carrying reagent amount were studied.

讨论了酯醇比、催化剂用量、反应时间、带水剂用量对酯化率的影响。最佳反应条件为：n：n=1：1.8，催化剂用量为乙酰乙酸乙酯质量的2%，带水剂用量为20mL，反应时间3h。

A salt of bromic acid.A white, odorless, tasteless crystalline ester, ethyl-para-aminobenzoate(C6H4NH2CO2C2H5), used as a local anesthetic.

苯坐卡因，对氨基苯酸乙酯一种白色、无嗅、无味的晶体酯，对位氨基苯甲酸乙酯，（c6h4nh2co2c2h5），用作局部麻醉剂

The main products are: phosphorous trichloride 300,000 tons / year, phosphorus oxychloride 100,000 tons / year, phosphorus pentachloride 50,000 tons / year, 10,000 tons trichloroisocyanuric parathion / year chloromethyl ether 5000 tons / year, triethyl phosphite 10,000 tons / year, triphenyl phosphite 5000 tons / year, three phosphoric acid ethyl butoxy 2000 tons / year.

主要产品有：三氯化磷30万吨/年、三氯氧磷10万吨/年、五氯化磷5万吨/年、三氯硫磷1万吨/年、氯甲基甲醚5000吨/年、磷酸三乙酯10000吨/年、磷酸三苯酯5000吨/年、磷酸三丁氧基乙酯2000吨/年。

Sodium diethyl oxalacetate ; \ Claisen condensation ; \ 1 phenyl 3 carbethoxy 5 pyrazolone

钠代草酰乙酸乙酯； Claisen酯缩合； 1苯基3羧酸乙酯5吡唑啉酮

In this paper, the applications of the environmental friendly solid acid catalysts for esterification were studied and the activities of these catalysts were discussed, by which the solid acid ferric sulfate x-hydrate was used first as catalyst in the synthesis of dimethyl fumarate and ethyl chloroacetate and solid super acid SO42-/Fe2O3 was used first as catalyst in the synthesis of ethyl p-nitrobenzoate.

本文研究了对环境友好的固体酸催化剂在酯化反应中的应用，首次以固体酸Fe_2(SO_4)_3·xH_2O为催化剂合成了新型防霉剂富马酸二甲酯和化工原料氯乙酸乙酯，以固体超强酸5O_4~(2-)／Fe_2O_3为催化剂合成了医药中间体对硝基苯甲酸乙酯，并探讨了这些催化剂的催化活性。

The main compositions of LP are shorter chain carboxylic acid and their ethyl esters, furan derivatives, cyclopentanone, phenol derivatives, benzene derivatives, aromatic ketone, aromatic acid derivatives, longer chain carboxylic ethyl esters and sterides. After upgrading, the main indexes reach the standard of fuel oil.

结果表明，LP的主要成分包括短链或环状脂肪酸及其酯、呋喃衍生物、环戊烯衍生物、苯酚衍生物、苯衍生物、芳酮、芳酸及其乙酯、长链脂肪酸乙酯和甾族化合物，经提质其主要指标达到了燃料油的标准。

Methods Diethyl phthalate and diethyl succinate were used for raw material to synthesize the Rubidate.

方法以邻苯二甲酸二乙酯和丁二酸二乙酯为原料合成茜草双酯。

Spiral Spirobifluorene acetylated is oxidated by m-chloroperoxybenzoic acid and hydrolyzed by sodium hydroxide ,obtaining 2,2 '- dihydroxy -9,9'- spiral Spirobifluorene .Through nitrification,Reduced by hydrazine hydrate, we may get the 2,2 '- diamino -9,9'- spiral Spirobifluorene which are characterizated by IR, 1H-NMR !

L-酒石酸和乙醇酯化得到酒石酸二乙酯，将保护羧基保护起来，然后用碘甲烷在2，3-位上两个甲基，得到2，3-二甲氧基-酒石酸二乙酯，再用氢氧化钠将其水解，得到2，3-二甲氧基-酒石酸，用五氯化磷将羧基酰化，得到2，3-二甲氧基- 1，4-丁二酰氯，经过与二环己胺反应，得到拆分配体2，3-二甲氧基–N，N，N'，N'-四环己丁二酰胺。

The fish samples were cleaned up by Florisil, then analyzed by GC-EI-MS to determine eight phthalic acid esters, diethyl phthalate, dipropyl phthalate, dibutyl phthalate, butyl benzyl phthalate, dipentyl phthalate, dicyclohexyl phthalate, dihexyl phthalate and diethyl hexyl phthalate.

鱼肉样品以Florisil硅藻土层析柱净化后，经气相色谱-电子轰击离子源-质谱法分析其中8种邻苯二甲酸酯含量：邻苯二甲酸二乙酯、邻苯二甲酸二丙酯、邻苯二甲酸二丁酯、邻苯二甲酸丁基苄基酯、邻苯二甲酸二戊酯、邻苯二甲酸二环己基酯、邻苯二甲酸二己酯、邻苯二甲酸二(2-乙基己基)酯。

Samples were subjected to high pressure ranging from 100 to 500 MPa. After high pressure treatments, the flavour compounds were extracted by Solid-Phase Microextraction. Analysis was carried out by Gas Chromatography-Mass Spectrometry. The key flavour compounds of orange juice were three alkenes (namely limonene, myrcene and α-pinene), two alcohols (linalool and α-terpineol), three aldehydes, one ketone and two esters (ethyl butyrate and 3-OH-ethyl hexanoate).

采用固相微萃取（Solid Phase Microextraction，SPME）方法对不同压力（100～500 MPa）超高压处理的鲜榨橙汁中的香气成分进行富集，并经气相色谱-质谱联用仪（Gas Chromatography-Mass Spectrometry，GC-MS）检测分析，橙汁中的主要香气成分有：3种烯（柠檬烯、月桂烯、α-蒎烯）；2种醇；3种醛；1种酮；2种酯（丁酸乙酯、3-OH-己酸乙酯），它们是构成橙汁的主要特征致香成分。

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。