2) C2-symmetry C2对称性 3) C2-symmetry C2对称 1. These new ligands bear not onlyC2-symmetryaxis but also a rigid ring. 利用易得的光学纯N-甲基氨基醇与1,2-双(二氯磷)乙烷缩合合成了一类新的具有C2对称轴的氮磷-氧磷配体(R,R)-双噁唑啉磷乙烷(BOAPE)1～4。
All compounds prepared are solid, air stable and possess a C2 symmetry axis. Due to restricted rotation around the C1-C1 bond, compounds 4a, 4b, 5a, 5b, 6 and 7 exist as stable atropisomers at rt. However for compounds trans-3 and cis-3, the bridged biphenyl system intercorverts at...
clino-axis 斜轴clinograph 测斜仪clinometer (1)测角器(2)测斜仪,像限仪clinorhombic 单斜的clinorhomboidal 三斜clip (1)接线柱,线夹(2)夹片(3)切去,限制clipped wave 限幅波,削平波clipper 限幅器,箝位器clipping (1)限制(2)削波,限幅clipping time 削波时间,限幅时间clock (1)钟(2)时钟脉冲(3)...
central symmetry 中心对称central terminal unit 中央终端装置central treatment station 集中处理站central uplift belt 中央隆起带central uplift 中央隆起central valley 中央谷central water-treatment plant 中心水处理站central 中心的central-difference approximation 中心差分近似法centralab 中心实验室centralisation =...
central symmetry 中心对称central terminal unit 中央终端装置central treatment station 集中处理站central uplift belt 中央隆起带central uplift 中央隆起central valley 中央谷central water-treatment plant 中心水处理站central 中心的central-difference approximation 中心差分近似法centralab 中心实验室centralisation =...
(1993), ChemInform Abstract: Stereoselective Synthesis of Diamino Diol Derivatives with C2-Axis of Symmetry. ChemInform, 24: no. doi: 10.1002/chin.199346139 Author Information Tokyo Coll. Pharm., Horinouchi, Hachioji, Tokyo 192-03, Japan Publication History Issue published online: 20 AUG 2010 ...
1、旋转对称Rotation about an n-fold axis of symmetry 一个分子可以同时有多个Cn轴,但n值最高的为主轴。以BF3为例,有C3轴同时也拥有三个C2对称轴,但C3为主轴。有时,低阶轴与主轴可以重合。例如: 图一BF3的主轴 图二C2与C4主轴重合 2、反射对称Reflection through a plane of symmetry(mirror plane) ...
constraints set by quantum oscillation, thermodynamic, and transport experiments, suggesting that the complete Fermi surface is resolved. The reconstructed structure—incompatible with translational-symmetry-breaking density waves—serves as an important test for band structure calculations of correlated electron...
In general, the most successful chiral ligands used in the asymmetric hydrogenation reactions are rigid chelating diphosphines possessing a C2-symmetry axis thus reducing the number of diastereomeric transition states [9]. Phosphines and phosphinites are among the most important phosphorus-based ...
13.A rope rests on two slopes which form a V shape, as shown in the figure below. They are both inclined at an angleθto the horizontal. The rope has uniform mass density, and its coefficient of friction with the slopes is1. The system has left-right symmetry. ...