乙酸的

Results61 peaks were separated and 16 constituents were identified, which were composed of about 96.46% of the total essential oil.ConclusionThe main constituents are allyl phenoxyacetate(80.17%), eudesma-4(14),11-diene(6.83%), 2,3-dihydro-3-methyl-3-benzofuran-methanol(2.94%), limonene(1.63%). The essential oil in Oenanthe javanica DC from Dali, Yunnan can be used in the food service industry and the cosmetic industry as spices.

水芹挥发油中的主要成分为苯氧乙酸烯丙酯（80.17%）、桉叶-4(14)，11-二烯（6.83%）、2，3-二氢-3-甲基-3-苯并呋喃甲醇（2.94%）、柠檬烯（1.63%），云南大理产水芹挥发油中萜类化合物及其衍生物含量在13%以上，苯氧乙酸烯丙酯含量高，可用作食品工业和化妆品工业的香料。

ConclusionThe main constituents are allyl phenoxyacetate(80.17%), eudesma-4(14),11-diene(6.83%), 2,3-dihydro-3-methyl-3-benzofuran-methanol(2.94%), limonene(1.63%). The essential oil in Oenanthe javanica DC from Dali, Yunnan can be used in the food service industry and the cosmetic industry as spices.

水芹挥发油中的主要成分为苯氧乙酸烯丙酯（80.17%）、桉叶-4(14)，11-二烯（6.83%）、2，3-二氢-3-甲基-3-苯并呋喃甲醇（2.94%）、柠檬烯（1.63%），云南大理产水芹挥发油中萜类化合物及其衍生物含量在13%以上，苯氧乙酸烯丙酯含量高，可用作食品工业和化妆品工业的香料。

In this method, titration with standard solution of perchloric acid in glacial acetic acid was used.

建立了在非水条件下快速测定食品中糖精钠的方法，以冰乙酸为溶剂，用高氯酸的冰乙酸标准溶液滴定，经过反复试验，相对标准误差0.92%~2.93%，加标回收率97.13%~100.3%，结果表明；该法定量分析准确，精确度高，可靠性和重现性好。

Esterification of phenethyl alcohol with acetic acid was studied using lanthanum chloride supported on activated carbon as heterogeneous catalyst.

以活性炭负载三氯化镧为非均相催化剂，对乙酸与苯乙醇之间的酯化反应进行了研究，考察了催化剂用量、醇酸摩尔比、反应时间对乙酸苯乙酯收率的影响。

Benzyl acetate was synthesized from acetic acid and benzyl alcohol as raw materials with phosphotungstic acid as catalyst.

介绍了以冰乙酸和苯甲醇为原料，采用磷钨酸作催化剂合成乙酸苄酯的方法，考察了反应物醇酸摩尔比、催化剂用量、带水剂用量、反应时间、带水剂品种、催化剂重复使用对酯化率的影响。

The mixture of Z-11-hexadecenyl acetate and Z-11-hexadecenol (4 : 1 or 9: 1) proved to be attractive to the male moths of Pseudaletia separata Walker in Japan was less attractive to the male moths of Mythimna separata Walker in North China during the second flying season.

在顺—11—十六烯醛中加入少量顺—11—十六烯醇乙酸酯(1—10％)，能显著地提高诱蛾活性。同时表明在日本活性很高的粘虫诱芯(顺—11—十六烯醇乙酸酯及顺—11—十六烯醇比例为8：1或9：1)在中国北方诱到的粘虫雄蛾数量极少。

The side chain of thioacetic acid has been sythesized from the material of acetic acid via four steps, then synthesized the key intermediate of 2-hydroxypenem via displacement, P〓induced cyclization and hydrolyzed reaction from the material of azetidinone.

以羟乙酸为原料，经四步反应合成了侧链化合物硫基取代的羟乙酸，发生取代反应导入到经七步合成的单环氮杂环丁酮中，然后发生酰化，Wittig诱导环化，水解等五步反应合成关键中间体2-羟甲基青霉烯。

There is disclosed a process for preparing sucralose by using monogroup protection. These researches included the following: 1. The method of using triethyl orthoacetate is an effective method of preparing sucrose 6-acylates for protection 6-position hydroxyl group.

本课题以单基团保护法合成三氯蔗糖，主要开展了以下几方面的研究： 1、原乙酸三甲酯法合成蔗糖-6-乙酸酯是保护6-位羟基有效的方法。

The extracts from evening primrose flower could significantly enhance the cellular immune function in immunosuppressed mice. Effects of ethylacetate extract was better than those of water extract.

月见草花乙酸乙酯提取物和水提取物均可明显增强环磷酰胺免疫抑制小鼠的细胞免疫功能，其中乙酸乙酯提取物的作用优于水提取物。

Moreover, the suggestions on development of domestic glycollic acid in the future are put forward also.

最后对羟基乙酸在国内外的生产现状进行分析，并对国内羟基乙酸今后的发展提出几点建议。

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。