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- A review with 21 references on development and applications of calix crown ethers are described. 摘要综述了杯芳冠醚的产生、发展及应用研究的新进展，展望了它的工业应用前景。
- Asymmetric allylation of 2-nitrocycloketones was catalyzed by palladium with chiral ferrocenylphosphine ligand modified by monoaza crown ethers (A-D). 在用氮杂冠醚改良的手性二茂铁膦与钯的络合物催化下,2-硝基环酮可进行不对称烯丙基化反应。
- Calculations using CNDO/2 method have been performed for the reactions of some crown ethers with alkali ions in aqueous solutions. 本文应用CNDO/2方法对几种冠醚与碱金属离子在水溶液中的配位反应能进行了计算。
- In this paper ten lactonic crown ethers weresynthesized, of which seven were new compounds.Theirstructures were confirmed by EA,IR,1HNMR andMS analysis. 合成了10个内酯型冠醚化合物，其中7个冠醚是新化合物，其结构均由元素分析，及红外、核磁、质谱分析证实。
- Three kinds of crown ethers were synthesized for the study of sodium ion-selective electrode. They are bis(crown ether)s, derivatives of hydroxy-crown ether and open-chain amide. 本文为满足研制钠离子选择电极的需要,根据主客体化学、配位化学和离子选择电极等理论,设计并合成了三类新型冠醚化合物,它们的结构经元素分析、红外、核磁共振和质谱数据确证。
- The recent progress of application of liquid crystalline crown ethers,carbon nanotube and water-soluble calixarene on analytical chemistry was reviewed. 综述了液晶冠醚、碳纳米管、水溶性杯芳烃在分析化学中应用的新进展。
- Two amide type double armed crown ethers containing dibenzo 18 crown 6 unit were synthesized and their structures were confirmed by IR, 1HNMR,MS and elemental analysis. 合成了2个含二苯并-18-冠-6单元的酰胺型双臂冠醚化合物,其结构经IR、1HNMR、MS和元素分析确证,该2个化合物都不具有液晶性。
- Terbium perchlorate complexes with crown ethers and p-phthalic acid have been synthesized and characterized by elemental analysis,molar conductivity and IR spectra. 合成了铽及掺荧光惰性镧、钆、钇的铽冠醚对苯二甲酸配合物。
- This article reviewed the synthesis of N-substituted aza crown ethers and their new applications to the field of selective complexation and extraction for metal ions. 综述了N-取代氮杂冠醚的合成和对金属离子的选择性络合和萃取研究的新进展.
- The extraction mechanism of At is inferred as following:The complex-anions AtX2-(X = Cl-, Br-, I-, OH-) were formed, mainly in aqueous solutions and paired with the cations M+(M=H+, K+, Na+), then the ion pair was extracted by crown ethers . At在溶液中主要形成络合阴离子AtX_2-(X=CI~-,Br~-,I~-,OH~-),它与适宜的阳离子M~+(M=H~+,K~+,Na~+)配成离子对被冠醚所萃取,这是At被萃取的主要形式,萃取反应简单表示为:M~++C_(有)+AtX_2~-(?)
- Three polystyrene-supported benzo-15-crown-5 and two polystyrene-supported acyclic crown ethers were prepared, and their complex capacities for K~+ and Na~+ and phase-transfer catalytic properties were investigated. 本文报道了三种聚苯乙烯支载苯并-15-冠-5与两种聚苯乙烯支载无环冠醚的合成,并研究了它们对K~+与Na~+的络合性能与相转移催化性能。
- In this article, the progresses in recent years of application of crown ether compounds to GLC chromatography, especially chiralcrown ethers and polysiloxane Stationary liquids, were introduced. 本文简要介绍了近年来冠醚化合物，特别是带有手性的冠醚化合物及聚硅氧烷冠醚固定液在气液相色谱中的应用发展。
- Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind. 摘要链状冠醚二芳醛在酸性条件下与氨基硫脲反应，合成了链状冠醚二芳醛缩氨硫脲类化合物。
- Two new exocyclic ring-fused boron-dipyrromethene (BDP) dyes with benzo crown ether subunit at meso-position were prepared.Their spectroscopic and electrochemical properties were investigated. 本文报道了两种中位为苯并冠醚亚单元取代的含稠合外环的硼-二吡咯亚甲基染料的合成、光谱和电化学性质。
- It is reported that cadmium in the form of CdI 2- 4 can be preconcentrated by its complex reaction with a crown ether called polybenzo 15 crown 5 (A type), which is coated on a molecular sieve and filled into a glass column. 报道了用装有涂布了聚苯并 15 冠 5 (A型 )的分子筛的玻璃分离柱可用于水中痕量镉的预富集。 此分离方法是基于CdI2 - 4络阴离子与冠醚的络合反应。
- Synthesis and characterization of Schiff base type liquid crystalline crown ether ligandsA new kind of schiff base type liquid crystalline crown ether ligand was synthesized on the base of molecul. 二、席夫碱型液晶冠醚配体的合成与表征从分子设计出发，设计并合成了一类新的席夫碱型液晶冠醚化合物。
- The crown of St Wenceslas was in prague cathedral. 圣文萨斯雷的皇冠保存在布拉格大教堂。
- Development of Chiral Crown Ethers 手性冠醚的研究进展
- The crown was beset with diamonds and jewels. 皇冠上镶嵌着钻石和珠宝。
