Computational Design of Enhanced Enantioselectivity in Chiral Phosphoric Acid-Catalyzed Oxidative Desymmetrization of 1,3-Diol Acetals
作者:Shan-Shui Meng、Peiyuan Yu、Yi-Zhe Yu、Yong Liang、K. N. Houk、Wen-Hua Zheng
DOI:10.1021/jacs.0c02719
日期:2020.5.6
for the highly enantioselectivedesymmetrization of 2-alkyl-substituted 1,3-diols is presented. A combination of computational and experimental studies has been utilized to understand the origin of the stere-ocontrol of oxidativedesymmetrization of 1,3-diol benzylideneacetals. DFT calculations demonstrate that the acetal protecting group is highly influential for high enantioselectivity, and a simple
LIQUID-CRYSTALLINE MEDIA HAVING HOMEOTROPIC ALIGNMENT
申请人:Merck Patent GmbH
公开号:US20150252265A1
公开(公告)日:2015-09-10
The present invention relates to liquid-crystalline media (LC media) having negative or positive dielectric anisotropy, comprising a low-molecular-weight component and a polymerizable component. The polymerizable component comprises self-aligning, polymerizable mesogens (polymerizable self-alignment additives) which effect homeotropic (vertical) alignment of the LC media at a surface or the cell walls of a liquid-crystal display (LC display). The invention therefore also encompasses LC displays having homeotropic alignment of the LC medium without alignment layers. The invention discloses novel structures for self-alignment additives which have a certain position of the functional groups.
COMPOUND HAVING SATURATED SIX-MEMBERED RING AND ALKOXY GROUP OR ALKOXYALKYL GROUP, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY ELEMENT
申请人:JNC Corporation
公开号:EP3260450A1
公开(公告)日:2017-12-27
Provided is a liquid crystal compound satisfying at least one of physical properties such as high stability to light or the like, a high clearing point, low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy and large dielectric anisotropy, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition.
A compound is represented by formula (1).
In formula (1), for example,
R1 is alkyl having 1 to 12 carbons;
ring A1, ring A2 and ring A3 are independently
in which, X1 and X2 are independently -O- or -CH2-;
Y1 is fluorine, -CF3 or -OCF3;
Z1 and Z3 are independently a single bond, -CF2O- or -COO-;
Z2 is a single bond, -CF2O- or -COO-;
L1 and L2 are independently hydrogen or halogen;
a is 0, 1, 2 or 3; and
n1 and n2 are independently 0, 1 or 2.
FLÜSSIGKRISTALLINE MEDIEN MIT HOMÖOTROPER AUSRICHTUNG
申请人:Merck Patent GmbH
公开号:EP3730590A1
公开(公告)日:2020-10-28
Die vorliegende Erfindung betrifft flüssigkristalline Medien (FK-Medien) mit negativer oder positiver dielektrischer Anisotropie enthaltend eine niedermolekulare Komponente und eine polymerisierbare Komponente. Die polymerisierbare Komponente umfasst selbst-ausrichtende, polymerisierbare Mesogene (polymerisierbare Selbstorientierungsadditive), die eine homöotrope (vertikale) Ausrichtung der FK-Medien an einer Oberfläche oder den Zellwänden einer Flüssigkristallanzeige (FK-Anzeige) bewirken. Die Erfindung umfasst daher auch FK-Anzeigen mit homöotroper Ausrichtung des FK-Mediums ohne Orientierungsschichten. Die Erfindung offenbart neue Strukturen für Selbstorientierungsadditive, die eine bestimmte Position der funktionalen Gruppen aufweisen.
本发明涉及具有负或正介电各向异性的液晶介质(FK 介质),包括低分子量成分和可聚合成分。可聚合成分包括可自定向聚合介质(可聚合自定向添加剂),可使 FK 介质在液晶显示器(FK 显示器)的表面或细胞壁上实现各向同性(垂直)排列。因此,本发明还包括不含取向层的 FK 显示器,其 FK 介质具有各向同性排列。本发明公开了具有特定官能团位置的自定向添加剂的新结构。
Flüssigkristalline Medien mit homöotroper Ausrichtung