five-membered
英
美
un. 五元的
[网络] 五环的
双语例句
- Tetronic acid, tetronic amine and their derivatives are five-membered heterocyclic compounds along with bio-and pharmacological activities.
特窗酸、特窗胺及其衍生物均是生物活性很高的五员杂环化合物，具有重要的研究与实用价值。 - Study on blends of five-membered carbonated soybean oil/ DGEBA
大豆油五元环状碳酸酯与双酚A环氧树脂共混体系的研究 - The Syntheses of Five-membered Heterocycles by Binary Catalyst System; Acid treatment of support on the performance of catalysts combined with heat storage function
二元双功能催化剂催化合成五元杂环化合物载体酸处理对蓄热-催化双功能催化剂性能的影响 - Preparation and Characterization of the Five-membered Cyclic Carbonates and Nanocomposites
五元环状碳酸酯的合成，聚合及其纳米复合材料的制备 - Self-Assembly Chemistry of Ligands Bridged by N-Containing Five-Membered Heterocyclic Rings and Symmetrical Ligands Containing Double Schiff-base
含氮五元杂环桥联及含对称双Schiff-base有机配体的合成及自组装化学研究 - The oxazolidone epoxy resin ( OXEP) was synthesized by the reaction of epoxide and toluene diisocyanate ( TDI). The single five-membered rings structure could be attained by controlling the reaction condition.
采用双环氧化合物与甲苯二异氰酸酯合成了低粘度的、具有单一五元环结构的唑烷酮环氧树脂（OXEP）； - The addition of a 1,3-dipole to an alkene for the synthesis of five-membered rings was a classic reaction in organic chemistry.
1,3-偶极子环加成反应是一个经典的反应。 - The regioselectivity of intramolecular nucleophilic ring opening reaction of aziridines is controlled by the ring size of products, five-membered ring> six-membered ring> seven-membered ring.
分子内的亲核开环反应主要受成环时环大小的控制，成环时的倾向是五元环>六元环>七元环。 - In the light of the interpretation of mass spectra of cyclic sulfoxides and the character of the strongest peak of PSO3E mass spectra, PSO3E were a series five-membered cyclic sulfoxides.
按照环状亚砜的质谱裂解机理和PSO3E质谱图中最强峰的质荷比特征，推断PSO3E是五元环亚砜。 - The result indicated that a five-membered cyclic structure was formed in every transition state.
结果发现，反应的过渡态都具有一个五元环结构，反应为取代反应。 - A study on correlation between electronic structure and inhibition properties of five-membered dinitrogen heterocyclic compounds
含二氮五元杂环类化合物的电子结构与缓蚀性能的关系 - All transition states, activation energies and potential curves of four possible reaction paths were obtained. It was found that the homolysis of N& NO2 bond in five-membered ring is the initial step.
求得可能的四种不同热解反应通道的过渡态、活化能和位能曲线，发现其热解引发步骤为五元环上侧链N&NO2键的均裂。 - Achievements on the Application of Hydrazine and Related Compounds for the Synthesis of Five-Membered Azole Heterocycles
肼类衍生物在五元唑类杂环合成中的应用进展 - HMO study on the dimethylene five-membered heterocyclic compounds
二亚甲基五员杂环的HMO研究 - Progress in Five-Membered Heterocyclic Metallocene Analogic Complexes
五元杂环类茂金属配合物研究进展 - The second part is about that five-membered rings compounds were synthesised using aromatic aldehyde,α-bromoketone and imine ester in the present of zinc power.
以芳香醛，α-溴代苯乙酮与氨基酸酯亚胺类化合物在金属锌粉的作用下，生成一系列的四氢吡咯化合物。 - Are discussed. While using the coordinate parameters in calculating the structure parameters of Si-O tetrahedrons and Si five-membered rings etc.
利用其原子座标参数计算了结构中Si&O四面体及硅五元环等结构参数。 - The six-membered rings exhibit slightly distorted chair, extremely distorted chair and half-chair conformation respectively, and the five-membered ring exhibits an envelope conformation.
其中六元环分别呈现微扭曲的椅式构象、严重扭曲的椅式构象及半椅式构象； - Determination of its structure shows that the dihedral angle of the two five-membered rings of NTO is 82.42 °, that the ligands contain one water molecule, and the heavy atom ( Pb) is surrounded by six atoms.
结构测定表明，两个NTO五元环平面的二面角为82.42°，有一分子水参与配位，重原子铅的配位数为6。 - Oxazoline, a five-membered heterocyclic ring containing both N and O coordinated atoms, is an excellent class among nitrogen-containing chiral ligands.
其中，同时含有N和O的五元杂环的恶唑啉配体是比较优秀的一类含氮手性配体。 - In chapter two, ortho C-H bonds in the carboxylic acid ring of N-alkyl and N-aryl substituted benzamides was successfully and selectively activated and were functionalized by olefins to give five-membered lactam.
N-烷基和N-芳基取代的苯甲酰胺羧酸环邻位的C-H键能够选择性的发生活化，被烯烃官能化后生成五元环的内酰胺。 - The ketene was found act as a one-carbon component in the reaction to form a five-membered ring. 2.
在此反应中，烯酮体现出不寻常的反应活性，作为单碳组分参与了形式上的[4+1]反应，形成五员环。 - The effect of CBs and the interaction between the five-membered imide rings and aromatic rings of CBs on the optical properties of the resulted PI/ CB nanocomposites was also discussed.
CB以及五元胺环和CB的芳香环之间的相互作用对复合薄膜的光学性能的影响也进行了讨论。 - The five-membered heteroaromatic triazole and six-membered benzimidazole are kinds of momentous compounds which have excellent pharmacological activity and widely used in medicine and biological science.
五元环的三唑类和六元环苯并咪唑类杂环化合物及其衍生物具有较好的生理学活性，广泛地应用在医药、生命科学等领域。 - When the one-carbon unit is at the formaldehyde oxidation level, the imidazolidine with a five-membered ring structure is the active site.
四氢叶酸辅酶（THF）在生物体内的作用是转移不同氧化态的一碳单元，当一碳单元处于甲醛氧化态时，活性部分是具有五元环状结构的咪唑烷环。 - One of the promising methodologies in chemical CO2 fixation is the cycloaddition between carbon dioxide with epoxides to afford the five-membered cyclic carbonates.
在CO2化学固定方面，利用二氧化碳和环氧化物环加成得到五元环状碳酸酯是最具前景的方法之一。 - With the use of glycerol and DMC, by-product of biodiesel-glycerol carbonate was prepared and the synthesis on the structure was investigated on the basis of gas chromatography and nuclear magnetic resonance ( NMR). The result proved glycerol carbonate to be the five-membered ring structure.
并在采用甘油与DMC反应模拟合成并分离出生物柴油副产物甘油一碳酸酯的基础上，利用气相色谱、核磁共振碳谱对副产物的结构进行定性分析，确证了其五元环结构。 - The effect of optoelectronic properties was studied by different five-membered aromatic ring.
研究了不同的五元环对二芳烯化合物光电性质的影响。