Pd<sup>II</sup>
-Catalyzed Regio- and Enantioselective Oxidative C−H/C−H Cross-Coupling Reaction between Ferrocenes and Azoles
作者:Zhong-Jian Cai、Chen-Xu Liu、Qing Gu、Chao Zheng、Shu-Li You
DOI:10.1002/anie.201813887
日期:2019.2.11
Asymmetric C−H bond functionalization reaction is one of the most efficient and straightforward methods for the synthesis of optically active molecules. Herein we disclose an asymmetric C−H/C−H cross‐coupling reaction of ferrocenes with azoles such as oxazoles and thiazoles. Palladium(II)/monoprotected amino acid (MPAA) catalytic system which exhibits excellent reactivity and regioselectivity for oxazoles
不对称CH键功能化反应是旋光分子合成中最有效,最直接的方法之一。在这里,我们公开了二茂铁与诸如恶唑和噻唑的唑的不对称CH / CH交叉偶联反应。钯(II)/单保护氨基酸(MPAA)催化体系,对恶唑和噻唑表现出出色的反应性和区域选择性。该方法为构建平面手性二茂铁提供了强有力的策略。机理研究表明,唑类化合物的CH键断裂很可能是通过S E Ar过程进行的,并且可能不是营业额限制步骤。
Pd/Cu-cocatalyzed reigoselective arylation of thiazole derivatives at 2-position under ligand-free conditions
作者:Jian Gu、Chun Cai
DOI:10.1039/c5ra08703a
日期:——
regioselective arylation of thiazole derivatives at the 2-position via palladium- and copper-catalyzed C–H bond activation underligand-freeconditions has been developed. The reaction proceeds smoothly with 1% palladium catalyst in the presence of 20% Cu(TFA)2 to furnish the desired products. The direct C–H arylation and no ligand made this method synthetically useful for the arylation of thiazoles
The asymmetric C–Hbond functionalization reaction is one of the most efficient and straightforward methods for the synthesis of optically active molecules. Herein, our work discovered a Pd-catalyzed asymmetric oxidativeC–H/C–H cross-coupling reaction of ferrocenes with azoles such as oxazoles and thiazoles. Mono-N-protected amino acid as chiral ligands with palladium(II) has been demonstrated as
Optical film, and polarizing plate and liquid crystal display device using the same
申请人:Nagai Michio
公开号:US20070065601A1
公开(公告)日:2007-03-22
An optical film comprising an optically anisotropic layer including a liquid crystalline compound, wherein the optically anisotropic layer satisfies the following formulae:
Re
(450)/
Re
(650)<1.25 Formula (1):
wherein Re(450) and Re(650) are in-plane retardation values (unit: nm) of the optically anisotropic layer at wavelengths of 450 nm and 650 nm, respectively;
0.09<
Re
—
m
(550)/
d
Formula (2):
wherein Re_m(550) is an in-plane retardation value (unit: nm) of a uniaxial alignment layer in which the director of the liquid crystalline compound is aligned to be parallel in the plane at a wavelength of 550 nm, and d is the thickness of the uniaxial alignment layer (unit: nm).
Optical Compensation Film, Polarizing Plate and Liquid Crystal Display Device
申请人:Matsubara Ryota
公开号:US20090091690A1
公开(公告)日:2009-04-09
The present invention aims to provide an optical compensation film that allows superior phase difference between a first optically anisotropic layer and a second optically anisotropic layer and excellent wavelength dispersibility in terms of front and inclined retardation of liquid crystal layers in liquid crystal cells, a polarizing plate containing the optical compensation film, and a liquid-crystal display device that can display superior images with less color change due to the polarizing plate.
In order to attain the object, an optical compensation film etc. is provided that comprises at least a first optically anisotropic layer and a second optically anisotropic layer, wherein the first optically anisotropic layer satisfies at least one of the following Equations (i) to (iii):
1≦
Re
1
450(0°)/
Re
1
650(0°)≦1.25: Equation (i)
1≦
Re
1
450(40°)/
Re
1
650(40°)≦1.25: Equation (ii)
1≦
Re
1
450(−40°)/
Re
1
650(−40°)≦1.25: Equation (iii)