In fused-ring and bridged-ring compounds two carbons are common to the two rings.
在稠环和桥环化合物中，两个碳原子是两个环公用的。
This paper reviewed the classic synthetic methods and Recent Developments of Indole Ring Compounds.
本文综述了吲哚环类化合物的经典合成方法及近年来的合成上的研究进展。
Ring compounds in which one or more of the carbon atoms in the ring are replaced by an atom of another element such as nitrogen, sulfur or oxygen.
为环状构造的化合物，环中一个或多个碳原子被另一元素的一个原子（诸如氮、硫、或氧）所取代。
Research progress regarding the use of PET reactions on synthesis of medium to large ring compounds and the prospects of their applications were introduced.
综述了利用分子内的光诱导电子转移反应合成中到大环化合物的进展。
The exhausts contribution in no-heating season was 70% and 50% in heating season; but the 6 ring compounds distribution from coal combustion was higher than that from the exhausts.
在非采暖季机动车尾气排放的贡献率为70%，在采暖季贡献率为50%，煤的燃烧对六环化合物的贡献高于机动车排放的贡献。
The key steps of hydrocracking of tetralin, the conversion of double ring compounds and the yields of mono-ring compounds were affected by the reaction temperature and the acidity of two catalysts.
四氢萘加氢裂化反应的关键步骤和双环化合物裂解的转化率以及单环化合物的产率与两种催化剂担体的酸性及反应温度有关。
The kind of ring molecules grown in this study, known as depsipeptides, are similar to some natural compounds produced by microorganisms that are employed as antibiotics, such as valinomycin.
这类环形分子在科研方面的生产如已知的缩肽类类似于微生物合成的用于抗生素例如真菌霉素的天然化合物。
At the same time, many newly developed compounds containing imidazole ring or thiazole ring also have bioactivity.
同时，含有咪唑环或噻唑环的新研制的众多化合物也具有生物活性。
Triazine is a type of heterocyclic organic compounds, it is important to ring nitrogen organic chemical raw materials.
是一种三嗪类含氮杂环有机化合物，重要的氮杂环有机化工原料。
Based on the infrared spectra, it is suggested that the scale insects waxy compounds are composed majorly by long-chain fatty alcohol and fatty acids and some compounds with aromatic ring.
此外，根据红外光谱特征分析，可以知道该虫蜡泌物的化学成分主要为长链脂肪酸、脂肪醇和一些带芳香环的化合物。
In this paper, ring-metalated phthalocyanine compounds were chosen as an electrochemical catalyst.
金属酞菁类化合物是一种电催化氧还原剂。
The five quinazoline compounds were prepared by using 2 amino 4,5 dimethoxy benzoic acid as original material, which underwent ring closing, halogenation and substitution.
方法：以2氨基4 ，5二甲氧基苯甲酸为原料，分别经过环化、氯代、取代等反应，合成了五种目标化合物。
It is demonstrated that the composition of alloy, type of carrier, and large ring coordinate compounds are directly linked to activity and stability of anode catalysts.
有关研究表明，合金组成、催化剂载体以及大环配合物对阳极催化剂的催化活性和稳定性有着直接的影响。
Acrylamides compounds containing 1, 2, 3-thiadiazoles ring and having anti-hepatitis B virus activity.
含1,2,3 -噻二唑环并具有抗乙肝病毒活性的丙烯酰胺类化合物。
Several new bis (1,2-dicarbonyl) compounds containing benzofuran or benzothiophene ring have been synthesized and identified by elemental analysis and Infra red spectroscopy.
本文首次合成了几种含苯并呋喃苯并噻吩环的新的芳香族四羰基化合物，并对它们进行了元素分析和红外光谱测定。
Purine: Any of a class of heterocyclic compounds with a two-ring structure composed of carbon and nitrogen atoms.
嘌呤：嘌呤是对由碳、氮原子组成的双环结构的杂环化合物的统称。
It was found that the coke precursor was mainly three ring aromatic compounds with a few of aromatic ethers.
实验结果表明：焦炭前身物主要由三环取代芳香化合物组成，并有芳醚类化合物存在。
Opening ring reaction for two compounds controls the decomposition rate.
二者的热分解活化能都表明开环反应是速度控制步骤。
The invention also relates to, in particular, compounds having two tetrahydropyrane rings or at least one tetrahydropyrane ring and a dioxane ring.
本发明特别涉及具有两个四氢吡喃环或者具有至少各一个四氢吡喃环和二韧榛返幕合物。
This article reviews the ring opening reaction of five membered nitrogen containing heterocyclic compounds.
综述了近年来各种五元氮杂环的开环反应及其在有机合成中的应用。
Carbasugars carbocyclic analogues of true sugars are compounds in which the ring-oxygen of furan oid or pyranoid sugars is replaced by methylene group.
摘要碳环糖是一类呋喃或吡喃糖环中的氧原子被亚甲基取代后形成的糖类似物。
PCB (polychlorinated biphenyl) : Any of a class of highly stable organic compounds prepared by the reaction of chlorine with biphenyl, a two-ring compound.
多氯联苯：任何一种由氯与联苯反应生成的非常稳定的二环有机化合物。
The structure-activity relationships of these compounds indicated that pyridyl group on the 4-styrene pyridine ring was necessary for the activity;
初步构效关系表明，反-4-苯乙烯基吡啶母环上的吡啶基是活性必须基团；
The compounds have the connecting ring structures of piperazine or piperidine, have notable antitumor activity, and provide a new choice for preparing antitumor drugs in clinical practice.
该类化合于具有哌嗪或哌啶的连接环结构，且具有显著的抗肿瘤活性，为临床上制备抗肿瘤药物提供了新的选择。
The compounds have the connecting ring structures of piperazine or piperidine, have notable antitumor activity, and provide a new choice for preparing antitumor drugs in clinical practice.
该类化合于具有哌嗪或哌啶的连接环结构，且具有显著的抗肿瘤活性，为临床上制备抗肿瘤药物提供了新的选择。
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