结构单元

Photoinduced Electron Transfer [2+2] Cycloaddition Reactions ofBenzannelated Isoquinolin-1-ones with Electron Deficient Alkenes Photoinduced [2+2] cycloaddition reactions of 11H-benzoxazolo[3,2-b]isoquinolin-11-one 8 and 11H-benzothiazolo[3,2-b]isoquinolin-11-one 13 with electron deficient alkenessuch as acrylonitrile, methyl acrylate, dimethyl fumarate and dimethyl maleate afforded a group of polycyclic isoquinoline derivatives bearing cyclobutane moieties ingood to excellent yields and resulted in the Schenck isomerization of the alkenes.

3苯并增环异喹啉-1-酮与缺电子烯烃的光诱导电子转移[2+2]环加成反应 11H-苯并恶唑[3，2-b]异喹啉-11-酮8和11H-苯并噻唑[3，2-b]异喹啉-11-酮13与缺电子烯烃如丙烯腈，丙烯酸甲酯，富马酸二甲酯及马来酸二甲酯的光诱导[2+2]环加成反应以高产率给出一系列含有环丁烷结构单元的多环异喹啉衍生物并导致烯烃的Schenck异构化作用。

A review of the principle of architecture element analysis and its applications to several types of depositional systems is given in this paper.

本文对结构单元分析法的原理及其在几类沉积体系中的应用作了介绍。

The formation of six-horn star-like nickel diselenide was controlled by the oriented attachment mechanism and secondary crystallizing process: i.e., primary building particles oriented attaching along six {100} faces, the formed mesocrystals secondarily crystallizing and finally resulting in six-horn nanostars.

其形成过程主要受定向连接和二次结晶生长机理控制：即二硒化镍的初级结构单元沿其六个{100}面定向连接生长，所得介晶中间产物经过二次结晶过程最终形成六角纳米星形貌。

Methodologies for stereoselective synthesis of alkenes are of great interest in synthetic organic chemistry since many biologically active compounds occuring in nature possess the structural skeleton of disubstituted or trisubstituted alkenes.

烯烃的立体选择合成方法学研究是有机合成化学中的重要课题，因为许多重要的天然产物中均含有双取代或三取代烯烃的结构单元。

Ach-Zehnder optical waveguide is an important component unit in electrooptic polymer modulators.

-Z光波导是聚合物电光调制器的重要结构单元。

A foreland basin system may be divided into four structural element s such as piedmont fold-thrust belt, foredeep depression belt, slope belt and frontal uplift belt.

在成藏研究中，前陆盆地可以划分为前陆褶皱冲断带、前渊坳陷带、斜坡带和前缘隆起带等4个结构单元。

The first and second generation of dendritic polyesters have been prepared by divergent synthetic ways using trimethylopropame as core and o-phthalic anhydride, glycidol as branched units.

以三羟甲基丙烷为核，邻苯二甲酸酐，环氧丙醇为支化结构单元，合成了第一及第二代树枝状聚酯。

The rest positions of 〓 unit are occupied by water and an oxygen atom of carboxylates from another type of ligand. With two carboxylates of this type of ligand, two ladderlike long chains are connected to form one-dimensional ladderlike chain structure.

第二类配体中每个羧酸根的一个氧原子与水分子饱和四面体结构单元余下的位置，并连接两个梯形长链形成一维梯形链状聚合物。

A series of five-membered lactams containing 1, 3-diene moity were prepared by RCEM reaction, the scope of this reacrion was expanded.

在上述研究的基础上，我们利用烯炔关环复分解反应合成了一系列含 1， 3-二烯结构单元的五元内酰胺化合物，从而进一步拓展了关环复分解反应的应用范围。

About tetra-n-butyl ammonium polyiodides: triiodide and pentaiodide anions are the basic building blocks; heptaiodide anion and undecaiodide anion are composed by triiodide anion, and nonaiodide anion is composed by pentaiodide anion. Therefore the character of triiodide, heptaiodide and undecaiodide polyiodides is similar, and that of pentaiodide and nonaiodide polyiodides is similar.

正四丁基多碘化铵化合物中：碘三离子和碘五离子是基本的结构单元，碘七离子和碘十一离子是由碘三离子构成的，碘九离子是由碘五离子构成的，所以碘三、碘七和碘十一形式的高聚碘具有相似的性质，碘五和碘九形式的高聚碘具有相似的性质。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失