查询词典 ether

Tagal collected in the mangrove forest in Hainan Island.Twenty-three compounds were isolated from the petroleum ether portion of the 95% ethanolic extract of the C. tagal.

从角果木的95%乙醇提取物石油醚萃取液中分离得到23个化合物，通过理化常数，1D NMR、2D NMR、IR、MS方法鉴定了19个化合物的结构，其中新化合物11个。

The logarithm difference values of partition coefficients of the compounds in butyl ether/water and in cyclohexane/water system were used for the measurement of the Lewis acidity, while the logarithm difference values of partition coefficients in trichloromethane/water and in tetrachloromethane/water system were used for the measurement of the Lewis basicity, and they were used successfully to differentiate the relative strength of Lewis acidity and basicity for 59 benzene and its derivates.

以化合物在正丁醚/水和环己烷/水溶剂体系中分配系数的对数差作为酸性指数，以其在氯仿/水和四氯化碳/水溶剂体系分配系数的对数差作为碱性指数，提出了一种新的度量有机物Lewis酸碱性的方法，按此方法成功地区分了59种苯系物Lewis酸碱性的相对强弱；并成功地将上述酸碱性指数引入定量结构—性质/活性相关研究之中，探讨了苯系物的正辛醇/水分配系数、水溶解度和土壤有机碳吸附系数等常见理化性质与其Lewis酸碱性间的相关性并建立了相应的定量模型，发现它们之间存在良好的相关性。

PFN or PFH forms binary FBS with ethyl ether, tetrachloromethane, n-heptane and toluene respectively. The critical mutual soluble temperature depends on the contents of FBS.

全氟已烯和全氟壬烯可以和乙醚、正庚烷、四氯化碳和甲苯等有机溶剂形成氟两相体系，其互溶温度与组成有关。

The micelle shape transformation of tert-octylpheny phenol polyethylene glycol ether (TX-100), sodium dodecyl benzene sulfonate and tetradecyl trimethyl ammonium bromide in heavy water solutions was studied by 1H nuclear magnetic resonance spectroscopy, including an NMR self-diffusion experiment. These experiments showed that the surfactants formed several shapes of micelles (spherical, ellipsoidal, and rodlike) at the respective concentrations which were far above their critical micelle concentration.

运用核磁共振一维氢谱和自扩散实验方法研究了聚乙烯乙二醇异辛酚醚(TX-100)、十二烷基苯磺酸钠和十四烷基三甲基溴化铵三种不同类型的表面活性剂在重水溶液中的胶束形状转变，发现它们在临界胶束浓度以上的各自相应浓度都有胶束形状的变化（由球状转变为椭球状或棒状）。

And the healing agent containing both multiply vinyl group and double SiH bonds was prepared by reducing the oligomer by lithium aluminum tetrahydride.,dichloropolymethylvinylsiloxane was prepared by hydrolyzing partially of MeViSiCl2 under nitrogen protected in ether.

甲基乙烯基二氯硅烷在氮气保护下，以乙醚为溶剂进行非充分水解，得到，二氯聚甲基乙烯基硅氧烷，再经过LiAlH4还原可得兼有多个乙烯基和两个SiH键的自修复单体。

The structure of compound 10 was confirmed by 1H NMR, 13C NMR, IR, and HRMS. In conclusion, resveratrol-dehydrodimer-11,11',13,13'-tetramethyl ether was synthesized through the new method in a total yield of 48.93%.

通过1H NMR、13C NMR、IR、HRMS等测试技术确定化合物10为二聚芪类化合物-脱氢二聚白黎芦醇－11，11'，13，13'-四甲醚，总收率48.93%。

In order to get the aryl alkynyl thio ether, we need to synthesize some important terminal functional compounds. Based on the preceding reaearch of our laboratory, we selected methyl thio methyl phenyl sulfone as nucleophilic reagent to eract with aromatic aldehyde and synthesized successfully a series of methylthio aryl ethynes I_ by"one-pot"reaction .

本论文在大量的文献调研和本实验室过去研究结果的基础上，利用亲核硫试剂甲硫基甲基苯基砜(methylthiomethyl phenyl sulfone， MP-S)与芳香醛的&一锅反应&，成功的合成了一系列甲硫芳炔化合物I_，从而为实现形态各异的芳炔硫醚类分子提供了一个良好的构筑平台。

So the difficult sequence of cracking to remove the sulfur for different sulfur compounds is that thiophene, benzothiophene＞alkyl side-chains of thiophenic compounds＞mercaptan, sulfur ether.

总之，不同含硫化合物裂化脱硫的难度顺序为：噻吩、苯并噻吩＞烷基噻吩＞硫醇、硫醚。

The number of components in steam distillation extraction for chafu was about 13,mainly containing Thymyl methyl ether,Beta-selinene and so on,which occupied over 18% in all components.

水蒸气蒸馏法和超临界萃取测定柴胡挥发油成分比较发现，鉴别峰的数量相对较少，水蒸汽蒸馏法提取的柴胡挥发油中鉴定出13个主要成分，占挥发油组分的18％以上，主要成分为百里基甲基醚、β—蛇床烯等；超临界萃取的柴胡低极性成分中鉴定出9个主要成分，占低极性组分的20％以上。

In chapter 3, 83 volatile chemical constituents have been identified from the petroleum ether extracted part of ethanol extract of Debregeasia longifolia Wedd., and the relative percentages of the compounds are determined by GC method. From the extract of trichloromethane and ethyl acetate, 8 compounds have been isolated.

第三章首次对长叶水麻乙醇提取物的石油醚萃取部分分离并鉴定出83种成分，并用毛细管气相色谱面积归一化法测定了各组分的相对百分含量；从氯仿和乙酸乙酯萃取部分分离得到了8种化合物，用波谱学方法鉴定了其中2种成分。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。