醚的

To our surprise we achieved the ligand 9, 11 and 29 with coordinating atoms fixing at benzylic and benzene ring positions, whose structure is unique in the planar chiral cyclophane chemistry.

以钯催化的烯丙基取代反应对配体进行了考察，硫醚或硒醚取代基在苄位取代的配体表现出更高的反应活性和更高的对映选择性，配体9和11均给出最高为94％的ee值。

The influences of inter-crosslinker and ratio of polyurethane-polyether to acrylic resin on the hydrophilic coating were investigated.The experimental data show that when the initiator is ammonium ceric nitrate and the inter-crosslinker is divinylbenzene in the preparation of polyurethane-polyether,the amount of ...

实验结果表明，在聚氨酯-聚醚树脂的制备中，用硝酸铈铵作引发剂，用二乙烯苯作内交联剂，在丙烯酸树脂的制备中，引发剂量为单体总质量的1.00%，聚氨酯-聚醚树脂与丙烯酸树脂的质量比为15∶1，制备的树脂转化率高，涂料亲水性能优异。

The intermediate decyl-glycidol ether of Gemini phosphate surfactant was synthesized with decanol and epichlorohydrin in the presence of phase-transfer catalyst; the intermediate decyl digomeric glycol of Gemini phosphate surfactant was prepared by opening ring reaction of decyl glycide ether and glycol in the presence of potassium as catalyst; and the influence of type and dosage of phase-transfer catalysts was studied.

以正癸醇与环氧氯丙烷为原料在相转移催化剂存在的条件下合成Gemini磷酸酯表面活性剂的中间体I-正癸基缩水甘油醚，讨论催化剂种类及用量对反应的影响；以乙二醇和正癸基缩水甘油醚为原料，金属钾为催化剂合成Gemini磷酸酯表面活性剂的中间体Ⅱ-正癸基低聚二醇，讨论催化剂种类与用量对反应的影响；以P2O5与正癸基低聚二醇为原料合成Gemini磷酸酯表面活性剂，讨论投料比、反应温度和反应时间等因素对反应的影响。

The formation mechanism for the C-PPV aggregation we proposed is: complex between K+ and the crown ether derivatives in the C-PPV brings two polymer chains closer together, and the K+ ions create interpolymer bridges, forming aggregations in the solution.

本文合成了可溶的带冠醚取代基的聚苯撑乙烯，其中冠醚基团的氧原子直接连在PPV主链上苯环的2、3位，并研究了聚合物在K~+存在下的自组装形成聚集体的行为。

Among the open-chain crown ethers and cryptands with a same structure, the compounds disubstituted at the amide nitrogen atoms show the larger extractability for Am and Eu than the monosubstituted ones. The compounds disubstituted at the amide nitrogen atoms by two phenyl groups show the larger extractability for Am and Eu than those by two alkyl groups.

3在结构相同的开链冠醚和开链穴醚中，酰胺氮原子上二取代化合物对Am和Eu的萃取能力大于一取代化合物；酰胺氮原子上两个取代基都是苯基的化合物对Am和Eu的萃取能力大于两个取代基都是烷基的化合物。

A process for preparing clean gasoline features that under existance of epoxidizing catalyst and alkoxylating catalyst, the olefine in gasoline and the oxygen and alcohol take part in epoxidizing and alkoxylating reactions to generate diolmonoether or dioldiether compounds which has higher octane number, so being excellent gasoline component.

本发明公开了一种清洁汽油的生产方法，在一个具有环氧化的催化剂以及同时具有烷氧化催化组分或者催化剂的存在下，汽油中的烯烃与氧、醇、发生环氧化、烷氧基化反应而生成二醇单醚或二醇双醚类化合物，这类化合物具有较高的辛烷值，是优良的汽油组分。

The main three parts of the present study are: the preformulation study involving screening the proper enhancers for transdermal aborption of α-asarone;Formulation study and developing a drug-in-adhesive transdermal patch of α-asarone using Eudragit E100 as pressure sensive adhesives;The α-asarone reservoir patch was prepared using 1 %HPMC of ethanol solution as medium and EVA membrane for controling the release of drug, and do the research its bioavailability.

主要内容有以下三个方面：药物经皮吸收制剂开发的处方前研究工作；采用Eudragit E100为压敏胶材料，进行了α-细辛醚胶粘剂分散型贴片的研究；以1%的HPMC的醇性溶液为储库介质，以EVA膜为控释膜，进行了α-细辛醚储库型贴片和生物利用度的研究。

A practical charged membrane which prepared from the blends of sulphonated polyphenylene sulfide/poly can be considered as a 3D lattices. The experimental conductivity was related with a 3D simulation and the result showed the membrane has a transition from insulator to conductor at the ratio of charged components SPPS about 0.144. Obviously, this value falls in the range of a theoretical simulation for a 3D lattices.

由於实际的荷电膜也可看作为三维格栅体系，因此，可用三维格栅体系程序对不同荷电分率膜的电导数据进行拟合，结果表明，对於实际的磺化聚苯硫醚／聚醚碸共混膜，当荷电组分SPPS的分率达到0.144时，共混膜即会从不良导体变为良导体，显然该值落在理论值0.1~0.2，因此，理论模拟结果与实际荷电膜传质的实验数据相吻合。

It indicated that the PES could be uniformly dispersed in melt ε-caprolactam with small domains depending on the strong interaction between the components, The hydrogen bonding was formed between the hydrogen atom on acid amide groups and the sulphone on PES resulting in the process of the dissolution of PES in melt ε-caprolactam being greatly accelerated.

结果表明，依靠其组分之间强烈的作用力，使PES能以较小的相畴均匀的分散在尼龙6基体中；酰胺基团上的氢原子能与聚醚砜中的砜基之间产生氢键作用，从而促进了聚醚砜在己内酰胺熔体中的溶解。

The allelopathic bioactivities on mycelial growth and the dose-activity relationships of two different Eucalyptus globulus leaves extracts,petroleum ether extract and chloroform extract,against five phytopathogens,Pyricularia oryzae,Rhizoctonia solani,Fusarium solani,Venturia pyrina,and Alternaria solani,were determined by mycelial growth rate method in PDA petri dish.

采用菌丝生长速率法，在PDA培养基上测定了蓝桉叶片的石油醚和氯仿提取物对水稻稻瘟病、小麦纹枯病、蚕豆根腐病、梨黑星病、番茄早疫病5种植物病原菌的化感作用，研究了蓝桉叶片的石油醚和氯仿提取物与病原菌的剂-效关系和提取物对病原菌菌丝生长速率的影响。

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。