The difference for electronegativity of N_3 in molecular-type and ionic-type azides may be due to the different bonding properties, which is found from the detail research about LMOs.

This Paper focus on recent synthetic development of aza-Wittig reaction in nitrogen heterocyclic and explains some mechanism of the reaction of carbonyl compounds with organic azides and tertiary phosphines.

本文阐述了羰基通过叠氮化物和三价膦形成的亚胺基膦的作用，以氮杂wittig反应的方式，合成含氮杂环化合物的进展。

High-pressure induced 1,3-dipolar cycloadditions of azides with both electron-deficient and electron-rich olefins are studied.

在B3LYP/6-31G水平上对高压诱导的叠氮化合物与缺电子烯烃以及富电子烯烃间的1,3-偶极环加成反应进行了研究。

In this paper, many organic azides were synthesized on the basis of existing literature. The influences of reaction conditions such as materials ratio, temperature, catalyst, time were optimized.

本论文在分析研究现有文献基础上，合成了一系列有机叠氮化合物，考察了物料配比、反应温度、催化剂、反应时间等因素对反应的影响，对合成工艺进行了优化。

Mono-addition Reaction of C_ ( 60) with Azides

C（60）与叠氮化合物的单加成反应

Studies on organoarsenic compounds& ⅷ. the reaction of arsonium ylides with aryl azides

两种呋咱环叠氮化合物的合成（英文）有机胂化合物的研究&Ⅷ.胂叶立德与叠氮化合物的反应

The traceless Staudinger ligation of azides and phosphines is an effective method to produce an amide bond.

叠氮化合物和膦硫酯的无痕施陶丁格连接反应是一种有效生成酰胺键的方法。

Organic azides were highly active chemical raw materials and intermediates. They were widely used in fine chemicals, aerospace, biotechnology and other fields.

有机叠氮化合物是一类活性很高的化工原料及中间体，可广泛应用于精细化工、航天、生物技术等领域。

Recent studies on the reduction of azides to amines are summarized and a bried evaluation and description of various reduction methods have been discussed.

本文综述了近年来叠氮化合物还原成胺的研究进展，并对不同还原方法的适用范围及优缺点进行了简单评述。

Dry developing electron beam resist& polycyclohexene-sulfone azides

干法显影的电子束抗蚀剂&聚环己烯砜叠氮系

Thermal decomposition of some organic azides

有机叠氮化物的热分解

Zinc metal in near-critical water ( 250 ℃) reduces azides to amines.

在近临界水（250℃）中用锌将叠氮化合物还原为胺。

Because of their unique chemical properties, azides have attracted the interest of chemists for a long time.

叠氮类物质由于它自生的化学性质，很早就引起了人们对它的关注。

These provide a pioneer model and basic data for theoretical study on intermolecular interaction of organic azides energetic compound.

为有机叠氮高能体系中分子间相互作用的理论研究提供了首例和基础数据。

Quantum Chemical Study on the Structures and Properties of the Molecular Clusters of Azides

叠氮类分子簇结构和性质的量子化学研究

Preparation of Amines by Reduction of Azides in Near-critical Water

在近临界水中由叠氮化合物还原制备胺

Application of azides in synthesis of heterocyclic compounds

叠氮化合物在杂环化合物合成中的应用

The mountains acted as a natural barrier to the spread of the disease.

群山成为了阻止该疾病扩散的天然屏障.

The skin loses its natural barrier to protect against sunlight. Then the skin and discolored.

皮肤失去了保护皮肤抵御阳光的天然屏障.

UN-natural barrier dangerous cliff path along the cliff , Kwong Yan monastery is spectacular.

险崖栈道居天险, 广严寺院乃壮观.

Weihai sea for the natural barrier of defense has an extremely important position.

为威海市海上天然屏障,在国防上有极其重要的地位.