炔键

Based on characteristics and connectivity of the groups in molecules,the group contribution method and topological method was combined together,a new method was developed which can be used to calculate the density of alkyne from molecular structure.

根据分子中基团的特性和连接性，将基团贡献法和拓扑方法结合在一起，发展了一种计算炔烃密度的新方法———基团键贡献法，该方法具有基团贡献法适用范围广和拓扑方法计算结果准确可靠的特点。

The tin hydride mediated alkenyl radical translocation/ cyclization process developed by Curran et al. represents a powerful procedure for the preparation of functionalized fivemembered rings by selective activation of a CH bond.

Curran等开发的以锡氢化物作为炔烃基团转位/环化反应的介质代表了用碳氢三键选择性活化法制备五员环官能团的高效反应步骤[2，3]。

The results show that there are eight reaction channels, corresponding to eight transition states, in the reaction process. The main parts of all transition states are non-planar five-membered ring, in which the geometry of Z -benzaldoxime and E -benzaldoxime is maintained partially, but the bond length, bond angle and charge are all changed.

结果表明，在苯甲醛肟与炔丙醇加成反应过程中， 8个可能反应通道的过渡态中均形成非平面五元环结构，其中苯甲醛肟的 Z 、 E 构型特征得到了部分保留，但主要部分的键长、键角均发生了变化，电荷也进行了重新分布。

On the other hand, reaction of lactol derived from D-mannose and D-glucose with Grinard reagent of propargyl bromide also proceed both withanti stereoselectivity and with high anti-specificity.

链增长及目标分子中的碳碳双键是由一步Wittig反应和一步末端炔的烷基化再部分氢化而获得，双键构型-选择性可达到95％以上。

Some products included methoxy group, naphthyl and heterocyclic aromatic moieties, and some were borne with two 1-propynyl groups. It is more important that compounds bearing halogens were also synthesized via this protocol.

运用此法不仅合成出一些含有醚键、萘环、杂环以及含有两个1-丙炔基的化合物，重要的是芳环上含有卤原子的化合物也能顺利地合成出来。

Understand the chemistry of alkenes and alkynes: nomenclature, electronic structures, sequence rule, cis-trans isomers, electrophilic addition reactions and mechanism, Markonikov's rule, conjugated dienes, rules of resonance forms.

A2 E3 了解烯类及炔类的化学性质：命名、电子结构，顺反异构物，亲电子加成反应及机制，马克尼可夫规则，共轭双键及共振式。

List alkanes,alkenes,and terminal alkynes in order of decreasing acidity of their terminal C-H.

答：由大到小排列烷，烯和端炔的端碳氢键的酸性

ALKYNES: Structure and Bonding.

22-24 炔烃：结构和成键。

Carbyne is one of carbon's allotropes. All carbon atoms were linked in the structure of liner conjugation by sp hybridization.

碳炔是碳的一种同素异形体，分子中所有的碳原子均以SP杂化成键组成一维共轭长链结构。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。