2) Catalytic enantioselective rection
![点击朗读](/dictall/images/read.gif)
C_2对称轴
3) C_2 Unsymmetric
![点击朗读](/dictall/images/read.gif)
非C_2对称
1.
Highly Enantioselective Addition of Organic Zinc Reagents to Aldehydes Catalyzed by C_2 Unsymmetrical Vicinal Diamines;
非C_2对称的手性邻二胺配体高立体选择性催化有机锌试剂与醛的加成反应研究
4) C 2 symmetric chiral auxiliary
![点击朗读](/dictall/images/read.gif)
C_2-对称手性辅助试剂
5) binaphthylic C_2-syrnmetry compound
![点击朗读](/dictall/images/read.gif)
C_2-对称联芳香化合物
6) C2-symmetric tetraaza
![点击朗读](/dictall/images/read.gif)
C_2对称性四齿配体
补充资料:(3)对称性
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强子之间存在的一种包括同位旋对称性和超荷对称性在内的更高的内部对称性。这个对称性表明,所有的强子可以分成若干组,组内的粒子有相同的时空对称性质(例如自旋、宇称)和重子数,有比较接近的静质量,有各不相同但按一定规律分布的同位旋 (
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历史 随着科学技术的进步,人们制造和探测高能粒子的手段不断更新,发现的新粒子、新现象越来越丰富。20世纪50年代确立了一系列奇异粒子,60年代又陆续发现了为数众多的共振态粒子,使得当时已发现的粒子(主要是强子)的数目猛增至一二百个之多,大大超出了发现元素周期律时已发现的化学元素的数目。在这种情况下,把这么许多粒子进行科学的分类,找出它们性质之间的内在联系,并进而追溯这些联系的根源,就成了当时十分迫切的课题。
在这样的基础上,60年代前期,经过许多科学工作者的共同努力,包括大量深入的理论探索和细致周密的实验分析,揭示了强子的
![](/picture/bkimg/ch_75/75_8_164_10.jpg)
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强子
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按照李群的基本理论,
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在
![](/picture/bkimg/ch_75/75_8_164_10.jpg)
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![kg2](/picture/bkimg/ch_75/75_8_164_50.jpg)
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![kg2](/picture/bkimg/ch_75/75_8_164_50.jpg)
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但是,坂田模型关于重子的分类方案却遇到了原则性的困难。例如,重子数
![](/picture/bkimg/ch_75/75_8_164_49.jpg)
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1961年在重新仔细分析实验资料的基础上,M.盖耳-曼和Y.奈曼提出了新的八重态分类方案(称为八重法),假定八个重子(N,Ξ,Σ和
![](/picture/bkimg/ch_75/75_8_164_25.jpg)
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![kg1](/picture/bkimg/ch_75/75_8_164_109.jpg)
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![902-01](/picture/bkimg/ch_75/75_8_164_112.jpg)
![902-02](/picture/bkimg/ch_75/75_8_164_113.jpg)
![](/picture/bkimg/ch_75/75_8_164_43.jpg)
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条