苯环

In the same time, a number of barbituric acid derivatives have been designed. The relations of structure-properties was studied by connecting anthraquinone, benzene and furan.

并以1H-NMR，FTIR，UV-vis，Mass进行了表征，确定了其结构，另外设计了几种巴比妥酸衍生物分子，通过在巴比妥酸衍生物中引入萘、苯以及芳香杂环等不同的共轭桥，研究了结构性能关系。

Chapter 5 extends our method to the approach of two-layer benzenoid systems. We validate the Clar rule of the"aromatic hexagon"and explain why these systems can be chemical synthesized successfully.

研究了双层苯型体系的加&块&方法及基本化学性质，证实了Clar&芳香六环&概念的可行性，解释了该类分子能够被化学合成的原因。

The known titanoheterocyclic compound〓 was synthesized in high yield by a new route involving an oxidative addition reaction of "titanocene"with benzil, and its structure was first confirmed by a single crystal X-ray diffraction method.

首次由&二茂钛&与二苯乙二酮的氧化加成反应，高产率地合成了一个已知的高价钛杂环化合物〓，并首次用X-射线衍射法测得该化合物的单晶分子结构。

In order to develop a new method to study the desorption and bioavailability of hydrophobic organic chemicals in soils, a method using semi-permeable membrane device to study desorption of HOCs in soils has been set up, and assisted desorption of polycyclic aromatic hydrocarbons, phenanthrene, pyrene, and benzo［a］pyrenein three different kinds of soils was studied using SPMD.

为了开发一种表征土壤中憎水性有机污染物解吸及生物有效性的新方法，建立了半透膜被动采样装置研究土壤中有机污染物解吸行为的方法，利用SPMD分析了多环芳烃菲、芘和苯并［a］芘在3种不同性质土壤中的辅助解吸行为。

2,7-di-diphenylamine-spiro[fiuorene -7,9'-benzofluorene] was successfully synthesized .Its structure was determined by 1HNMR、MS、IR and Elemental Analysis.Yield of each reaction was more than 70%.

设计并合成了一种新型的含二苯胺基团的螺芴化合物2，7-双二苯胺-螺环-[芴-7，9'-苯并芴]，并通过了1HNMR、MS、IR、元素分析图谱检验，每步反应的产率均在70%以上。

Three new ferrocenylmethyl-substituted indenes and cyclopentadienes were synthesized by the addition of hydrogen anion and carbon anion to fulvene and benzofulvene respectively, moreover, their structures were characterized by NMR and MS.

本文以二茂铁基富烯和二茂铁基苯并富烯为前体，通过负氢和负碳对双键的加成，合成了3个新型的二茂铁基甲基取代的茚及环戊二烯，并对其结构进行了核磁及质谱表征。

Accordingly, in the original reaction (formation of B from cyclopentadiene and benzoquinone) Diels and Alder found only one of the following six conceivable stereoisomers of B.

因此，在该原始反应中(即通过P-苯醌和过量的环戊二烯生成B)，Diels and Alder发现在他们推测的六个立体异构中，只有一个出现。

Owing to the inclusion complexation, the benzoquinone as the electron acceptor of reduced GOD in the enzyme-containing polymer membrane has higher concentration, thereby faciliating the electron transfer of the immobilized enzyme.

由于分子包合作用，作为电子受体的苯醌在含酶的环糊精聚合物膜中具有较高的浓度，从而加速了固定化酶的电子传递。

Two key compounds butenonitrile and benzothiazole were found.

GC-MS检测解析结果为雪里蕻腌菜的挥发性成分主要为烃、醇、酯、腈及含硫和氮的杂环化合物，其中丁烯腈及苯并噻唑与雪里蕻腌菜的特征风味有关。

A series of 2-acetylformanilides were prepared,followed by thiolation with Lowesson reagent to afford 2-acetylthioformanilides,which further reacted with Mn3·2H2O in glacial acetic acid under microwave irradiation to afford 2-acetyl benzothiazole s.

合成了一系列的硫代酰胺，研究了它们在微波辐射醋酸锰作用下发生氧化自由基环化反应，成功地合成了一系列2-乙酰基苯并噻唑衍生物，其结构经红外光谱、核磁共振谱和质谱得到了证实

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。