醚

We studied effect of terpene enhancer with different structure on transdermal permeation profile of model drug.

本文首先考察了不同结构(醚类、单环单萜、双环单萜和倍半萜)代表萜类促渗剂对盐酸普萘洛尔透皮性质的影响。

Objective Widespread used as gasoline oxygenate additives, methyl t-butyl ether were added to gasoline to enhance the octane number, reduce carbon monoxide in exhausts and to substitute for tetraethyl lead as an anti-knock agent.starting in the winter of 1992, MTBEup to 15wt.

研究目的甲基叔丁基醚(Methyl Tert-Butyl Ether，MTBE)是一种新型的汽油添加剂，主要用来增加汽油辛烷值，提高汽油燃烧效率，减少汽车尾气中一氧化碳等有害物质的排放，并代替四乙基铅用作汽油防爆剂。

In the process of laboratory study, oxycodone was prepared by oxidating thebaine at 6,14-position under oxydol, hydrodeoxidizing 7,8-position double bond and 14-position ether under palladium catalyst. Furthermore, N-methyl of oxycodone was isolated byα-chloro-ethyl chloroformate under anhydrous condition and protection of 14-position hydroxyl to obtain noroxycodone, which was further converted into methylnaltrexone by N-alkylation in presence of cyclopropyl bromomethane, then by isolating 3-position methyl of methylnaltrexone under boron tribromide, becoming hydrochloride to prepare target compound, natrexone hydrochloride.

实验室工艺方面，本文首先用双氧水氧化蒂巴因的6-位和14-位、在钯炭催化下加氢还原7-8位双键和14-位醚合成羟考酮，然后提出并优化了在无水和14-位保护的情况下，用氯甲酸-α-氯乙酯脱去羟考酮的N-位甲基合成去甲羟考酮，再用环丙甲基溴将去甲羟考酮的N-位烷基化合成甲基纳曲酮，最后采用三溴化硼脱去甲基纳曲酮的3-位甲基和成盐酸盐合成盐酸纳曲酮。

Thermolysis of DM-DMI bis-carbamate was carried out in 3wt % solution of diphenyl ether at 254℃ for 5-6 hours, and the yield of DM-MDI is 61％ after purification.

而在第二步骤的热裂解反应中，在3wt ％二苯醚溶液中，控制反应温度在254℃，经反应5-6小时即得到DM-MDI，经浓缩及纯化后主产物之产率为61％。

Polyurethanes are one of the most important thermoplastic elastomers and have been widely used in medical-device manufacturing as well as in other applications.

摘要聚醚聚氨酯材料具有优良的力学性能和生物相容性，在植入装置和人工器官中得到了广泛的应用。

Result The results showed that its components were quite complex, and 89 organic compounds were identified. There were 72 kinds of oxygen-containing organic compounds which included esters, phenols, aethers, ketones and alcohols in the depolymerization product, small amounts of alkanes, alkenes, arenes, thiophenol and nitrogen-containing organic compounds were also detected, which showed that characteristics of the product with high oxygen content, low nitrogen and sulphur content.

结果］超临界乙醇解聚产物成分十分复杂，GC/MS分析鉴定出89种有机化合物，其中72种为含氧化合物，主要有酯、酚、醚、酮和醇等，还检测出少量烷烃、烯烃、芳烃、苯硫酚和含氮化合物，反映了解聚产物的高含氧量和低含氮硫量的特性。

Pleasingly, the residual thiophenol could be readily removed without silyl ether hydrolysis via passage of the product through a pad of basic alumina.

怡人、残硫可随时取消含硅基醚通过经水解产物透过垫基本氧化铝。

We supply tin-plate cans to Akzo/ICI, PPG/SigmaKalon, Ronseal, DuPont, BASF and many others.

我们供应镀锡罐阿克苏/卜内门，聚醚/ SigmaKalon ， Ronseal ，杜邦，巴斯夫公司和许多其他问题。

Six lateral difluorine substituted tolan -type liquid crystals were synthesized via Sonogashira cross-coupling of 4-alkylphenylacetylene and 4-iodo-2,3-difluoro-1-alkoxybenzene under the protection of argon.

用邻二氟苯为起始原料，在-78℃经过两次选择性"邻位金属化"反应、醚化反应、氧化反应制得2，3-二氟-4-碘-1-烷氧基苯，再与4-烷基苯乙炔在氩气保护下进行Sonogash ira偶联反应，制备出6种侧向二氟取代二苯乙炔类液晶。

Based on the molecular topological theory, a modified group dyeing indexL is introduced. It is used in the study of refractive index of the ketones and ethers. Relationship between the refractive index and molecular structure of 57 ketones and ethers is studied by using quantitative structure-property relationship technique. The reasonable molecular modeling equations are obtained by multiple regression for the prediction of the refractive index of ketones and ethers.

在分子拓扑理论的基础上，提出了一个修正的基团染色指数L，运用定量结构－性质相关技术研究了57种酮类和醚类化合物分子的折射率与分子结构间的定量关系；通过多元回归的方法建立了L与折射率的定量结构－性质相关模型。

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。