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Ethyl vanillin was synthesized by the phase-transfer catalysis CTEAB and O-ethoxyphenol, which was prepared from pyroeatehol with an overall yield of 55.2%, and the factors in the reaction, such as phase-transfer catalysis and temperature, were discussed.
中文意思:
摘要以邻苯二酚为原料,首先合成中间体邻乙氧基苯酚,然后以十六烷基三乙基溴化铵为相转移催化剂合成了乙基香兰素,考察了相转移催化剂的选择及反应温度,最后收率为55.2%。


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Ethnic women have long used hair extensions to create braids(6) or sleek(7) styles as an alternative to chemical straightening, but new techniques and improved hair quality have propelled(8) the trend into the mainstream. 有些受信仰限制的女人把别人的长发续在自己头上,编出辫子或者其他时髦的发式来代替化学处理,而现在的新技术和更好的发质把这种趋势推向主流。
Ethology and Evolution on the Web. Study of human ethology, evolutionary psychology, and related fields. 行为学以及演化.关于人类行为学、演化心理学以及相关领域的研究。
Ethology is concerned with the study of adaptive, or survival value of behavior and its evolytionary history. 动物行为学是与动物的适应性,或行为上的生存价值及进化史方面的研究有所关联。
Ethyl 3-benzoylacrylate(E3BA) is pale yellow liquid , it can't melt in water . It is one of the important intermediate for synthesizing technical products. 苯甲酰基丙烯酸乙酯为淡黄色透明液体,不溶于水,能溶于大多数有机溶剂,是原药合成中重要中间原料之一。
Ethyl alcohol: un-denatured ethyl alcohol with an alcohol content in excess of 80 percent of the total volume. 七)酒精︰凡含酒精成分以容量计算超过百分之八十之未变性酒精。
Ethyl vanillin was synthesized by the phase-transfer catalysis CTEAB and O-ethoxyphenol, which was prepared from pyroeatehol with an overall yield of 55.2%, and the factors in the reaction, such as phase-transfer catalysis and temperature, were discussed. 摘要以邻苯二酚为原料,首先合成中间体邻乙氧基苯酚,然后以十六烷基三乙基溴化铵为相转移催化剂合成了乙基香兰素,考察了相转移催化剂的选择及反应温度,最后收率为55.2%。
Ethylene (ethane) A gaseous hydrocarbon (C2H4), produced in varying amounts by many plants, that functions as a plant HORMONE. 乙烯:是一种气态的碳氢化合物(C2H4),许多植物都可产生。
Ethylene/octene copolymer sythesized by metallocene catalyst was a new kind of thermoplastic elastomer, which was molded as elastomer material by plastic common molding process such as injection, extrusion and blowing and also by rubber process such as ch 采用茂金属催化剂合成的乙烯-辛烯共聚物是一种新型热塑性弹性体,可用注射、挤出、吹塑等常用加工方法成型,又可用过氧化物进行化学交联,用橡胶加工方法制成弹性体材料。
Etienne, which introduced Klimt to the United States in 1959, calls the 1907 portrait “literally priceless.” Stylistically similar to Klimt's world-renowned “The Kiss,” the painting is replicated on T-shirts, cups and other souvenirs. 在风格上与克里姆特闻名于世的《吻》相似,其画面常常出现在T恤衫、口杯和其他纪念品上。
Etiolation The type of growth exhibited by plants grown in darkness, usually from seed. 黄化:是植物在黑暗中生长(通常从种子开始)所表现出来的生长类型。
Etiologies for the various gastropathies can include: alcohol, drugs such as NSAIDS, stress, uremia, bile reflux, portal hypertension, radiation, and chemotherapy. 各种胃病的病因包括:酒精,药物,例如NSAIDS(非类固醇类抗炎药),应激,尿毒症,胆汁逆流,门脉高压症,放射线,和化疗。
 
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