membered

In contrast, electro-withdrawing groups CHO and COCH_ 3 on the attacking site will favor the intramolecular nucleophilic substitution of nitrogen and form 5-membered heterocyclic compounds.

而当R为吸电子基团-CHO、-COCH3时，主要发生分子内氮原子上的亲核取代反应，产物为含氮的五员杂环化合物。

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The results from X-ray crystallographic analysis for 2b indicated that it has a six membered phosphorus-containing hetero ring, which bears a 127.7 ° of the largest bond angle and a 97.9 ° of the smallest one.

X射线晶体结构解析表明异构体2b分子中有一个不规则的含磷六元杂环.环内最大键角为127.7°，最小键角为97.9°。

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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

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The word "remembered" is in quotes.

remembered一词用引号括了起来。

《柯林斯高阶英汉双解学习词典》

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

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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。

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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。

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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。

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As he spoke, his eyes half closed, and immediately I re-membered Scudder's description of a man who could'hood his eyes like a hawk.

他说话的时候，眼睛眯着，我猛地记起斯卡德尔说过一个人，这个人能像猫头鹰那样眯着眼睛。

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The result shows that the Transition States of the H-transfer and Cl-transfer of the title compound are both three-membered ring structure, and both products are linear molecules.

结果表明，无论是氢原子H迁移还是氯原子Cl迁移都经过1个三元环过渡态，生成直线型产物。

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In EIMS there are many frame-rearrangement ion peaks. The cleavage of C-O, C-F. C-CF3 bonds and the formation of five-or four-membered heterocyclic ring ions containing nitrogen by losing CO are major mass spectrometric characters.

在EIMS中，均存在较多的骨架重排离子峰，其中C O，C F，C CF3，键断裂及失去CO形成的五元，四元含氮杂环离子是重要质谱特征。

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Computing the Wiener index of Six-membered ring spiro chains using block-cut-vertex tree

利用块割点树计算六环螺链的Wiener指标

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But I re － membered ！ how cruel children can he to small animals ， and I did not want the boy to take his revenge on me.

我想起小孩子们对小动物会有多么残酷，我可不想他找我报复，

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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；

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The progresses in five-membered heterocyclic metallocene analogic complexes and their application in olefin polymerization are reviewed.

综述了五元杂环类茂金属配合物的研究进展及其在烯烃聚合中的应用.

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The calculated results show that the aza Wittig reaction is a two step reaction, having one four membered ring intermediate on its reaction surface.

计算结果表明该反应是一个二步反应，在反应途径上存在一个四元环中间体。

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Azole: a class of organic compounds having a five-membered heterocyclic ring with two double bonds.

氮杂茂: 一种由五种杂环元素,两组粘合剂组成的有机化合物.

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Proline is the only natural amino acid which contains an important five-membered secondarygroup.

脯氨酸是天然氨基酸中唯一含五员环亚胺,其衍生物和类似物广泛用于不对称合成、对映体拆分和生物化学中.

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then introduce the cap seal structure of carbon nanotubes on legs pentagon rule and the euler theorem, the structure of the nanotubes has five membered ring and seven membered ring.

接着介绍了依托于鼎足五边形定则和欧拉定理的碳纳米管的封帽结构，结构中存在着五元环和七元环。

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Carbonyl group on position C18 and epoxy three-membered ring on position C7~ C8 are the connecting parts;

18位上的羰基和7～8位上的三元氧环是其活性的可能结合部位；

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The result shows that the transition state of the rearrangement reaction has a three-membered ring structure.

结果表明，该重排反应经过一个三元环过渡态。

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Synthesis of 5-membered Ring Compounds Using Zirconium; Synthesis and Mechanism of Nanocrystalline Ceria-Zirconia Solid Solution by SAS Process

锆参与的五元环状化合物的合成方法学研究纳米晶铈锆氧化物固溶体的SAS合成及机理研究

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Special methods for four-membered Carbocyclic rings are given in Chapter 32.

制取四碳环化合物的特殊方法是在第三十二章中阐述的.

词典精选例句

This Paper has reviewed five-membered cyclic sulfate's synthesis and it's application for stereoselective synthesis.

本文将对五元环硫酸酯化合物的合成及其在有机立体合成中的应用作一综述.

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Results suggested that the four-membered ring of nopyl acetate cleaved first, then hydrated. Other products were mainly obtained from epoxidation of the double bond, and further oxidation of tertiary hydrogen on C_ (-1) and C_ (-5).

对反应产物的分析结果表明：反应主要是四元环开裂，并进一步水合，另外伴有少量双键环氧化的产物，这些环氧化的产物还可进一步在C-1和C-5处发生叔氢氧化。

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carbocyclic compounds three-and four membered rings

碳环化合物三元环和四元环

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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。

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