醚

Since Zinke discovered calixarene in 1940s, the synthesis of calixarene was improved continuously and more calixarene derivatives, like ester, ether, ketone derivatives, calixcrowns, chiral calixarenes, heteroatom calixarenes and calix polymers etc., were obtained.

自二十世纪四十年代Zinke等发现杯芳烃以来，越来越多的杯芳烃衍生物如杯芳烃的酯、酮、杯芳冠醚、手性杯芳烃、含杂原子的杯芳烃、生色杯芳烃、杯芳烃聚合物等被合成出来。

With the single-crystal X-ray studies, the nanoscale rigid cavity of the aromatic macrocycle was approved, and nature of the heteromorphism of aromatic macrocyclic oligomer was also explained with the study of two kinds of single crystal with different steric structures.

并利用单晶X光衍射技术研究了三种不同结构的环状齐聚物的单晶结构，第一次通过大环分子与其对应线性齐聚物键长、键角和二面角的变化解释了聚芳醚酮类刚性大环分子环张力产生的原因。

The contents of alt and ast in the serum were determined by chromatometry 16hr after administration of ccl4. resultsthe five kinds of extracts extracted by different heteropolarity dissolvents but ligarine extract, the free and conjugated anthraquinones significantly decreased the activities of aminopherase.

结果以不同极性溶剂提取的5种决明子提取物中，除石油醚部分外，其余各组均有显著降低转氨酶活性的作用；游离型和结合型蒽醌均有显著的降低转氨酶活性作用；决明子的生、炒两类炮制品也同样有显著的降酶作用，但生品略优。

Surface modified nano-sized mgnesium hydroxide was prepared by direct precipitation method with magnesium nitrate hexahydrate and sodium hydroxide as raw materials,and sodium fatty alcohol polyoxyethylene ether carboxylate as modifying agent.The optimum dosage of modifying agent was 0.2% of the mass of magnesium hydroxide,which was confirmed by sediment volume experiment.Modified and unmodified samples were characterized by fourier transform infrared spectroscopy,X-ray diffraction,transmission electron microscope,and tap density test.

以六水硝酸镁、氢氧化钠为原料，脂肪醇聚氧乙烯醚羧酸钠为改性剂，采用直接沉淀法一步合成改性纳米氢氧化镁，用沉降体积实验确定改性剂的最佳用量为氢氧化镁质量的0.2%，通过红外光谱、X射线衍射、透射电镜、表观密度对改性前后的样品进行表征。

Methods 4-Hydroxybenzonitrile (2) as the starting material was transformed to 4-hydroxy-thiobenzamide (3) via thioformylation. And ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate (4), which was synthesized via cyclization from 3, was treated with hexamethylenetetramine to generate the intermediate ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate (5). The target compound febuxostat (1) was obtained from 5 by etherification, cyanidation, hydrolysis.

以羟基苯腈为原料，经硫代甲酰化得到对羟基硫代苯甲酰胺(3)，3经环合得到2-（4-羟基苯基）－4-甲基－噻唑－5-羧酸乙酯(4)，4与乌洛托品反应，得到中间体2-（3-甲酰基－4-羟基苯基）－4-甲基－噻唑－5-羧酸乙酯(5)，之后再经醚化、氰化、水解得到目标产物(1)。

Instead of Hildebrand equation to treat the results of experiment,the equation of two-dimensional solubility parameters has been used to gain the nonpolar part of solubil...

本文讨论了方法的准确性和合理性，并用二元溶解度参数公式代替Hildebrand公式对实验结果进行处理，得到了聚醚溶解度参数的非极性部分，它们分别为6.44、7.15和7.53（cal／cm3）。

Three open chain crown ether s and triglycolyl isopropylidene hydrazide complexes of rare earth nitrate were synthesized for the first time with isoproylidene hydrazide as the terminal group and through IR, 1HNMR, MS, characterized their structures have been characterized.

首次合成了以丙酮酰腙为端基的3种双酰腙型开链冠醚及三甘双酰丙酮腙稀土硝酸盐配合物，并通过元素分析，IR，1HNMR，MS对分子结构进行了表征

This paper provides a comprehensive review and critical analysis on the different reaction pathways for catalytic conversion of glycerol into commodity chemicals, including selective oxidation, selective hydrogenolysis, selective dehydration, pyrolysis and gasification, steam reforming, thermal reduction into syngas, selective transesterification, selective etherification, oligomerization and polymerization, and conversion of glycerol into glycerol carbonate.

本文提供了一个全面的审查和批判性分析的不同的反应途径甘油催化转化成商品的化学品，包括选择性氧化，选择性氢解，选择性脱水，热解气化，重整，热还原成合成气，选择交换，选择性醚化，齐聚和聚合，并转换成甘油甘油碳酸盐。

For a comparative study, polyethers based on hydroquinone and 4,4'-biphenol were also prepared and characterized.

为了性质比较，本研究亦合成了由hydroquinone和4，4'-bisphenol所衍生的聚醚并测定其性质。

The functionality of the polyether polyol is determined by the number of active hydroxyl groups per molecule.

功能聚醚多元醇，是由一些积极的羟基，每个团体分子。

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。