Base-Controlled Selectivity in the Synthesis of Linear and Angular Fused Quinazolinones by a Palladium-Catalyzed Carbonylation/Nucleophilic Aromatic Substitution Sequence
A new approach for the facile synthesis of fused quinazolinone scaffolds through a palladium‐catalyzed carbonylative coupling followed by an intramolecular nucleophilic aromatic substitution is described. The base serves as the key modulator: Whereas DBU gives rise to the linear isomers, Et3N promotes the preferential formation of angular products. Interestingly, a light‐induced 4+4 reaction of the
Oxidative Synthesis of Quinazolinones under Metal-free Conditions
作者:Jian-Bo Feng、Xiao-Feng Wu
DOI:10.1002/jhet.2562
日期:2017.1
A metal‐free procedure for the synthesis of quinazolinones underoxidativeconditions has been developed. In the presence of DABCO and TBHP, the desired products can be obtained in moderate yields with 2‐fluorobenzaldehydes and 2‐aminopyridines as the substrates.
Liquid Crystal Display Operating in a Vertically Aligned Mode
申请人:Palto Serguei Petrovich
公开号:US20100118241A1
公开(公告)日:2010-05-13
The present invention relates generally to the field of liquid crystal display devices and more particularly to a liquid crystal display device operating in vertically aligned mode (VA-mode) in which liquid crystal molecules having a negative dielectric anisotropy are aligned generally perpendicularly to a panel surface of the liquid crystal display. A liquid crystal display according to the invention comprises a liquid crystal cell (
6
) of a vertical alignment mode, at least one polarizer (
2, 10
) arranged on each side of the liquid crystal cell, and at least one compensating structure (
3, 7
) disposed between the liquid crystal cell and at least one of the polarizers. The polarizers have transmission axes (
11, 18
) which are perpendicular to each other.
TIMARI, GEZA;HAJOS, GYORGY;MESSMER, ANDRAS, J. HETEROCYCL. CHEM., 27,(1990) N, C. 2005-2009
作者:TIMARI, GEZA、HAJOS, GYORGY、MESSMER, ANDRAS
DOI:——
日期:——
[EN] LIQUID CRYSTAL DISPLAY OPERATING IN A VERTICALLY ALIGNED MODE<br/>[FR] AFFICHAGE À CRISTAUX LIQUIDES FONCTIONNANT DANS UN MODE ALIGNÉ VERTICALEMENT
申请人:CRYSOPTIX LTD
公开号:WO2007141025A2
公开(公告)日:2007-12-13
[EN] The present invention relates generally to the field of liquid crystal display devices and more particularly to a liquid crystal display device operating in vertically aligned mode (VA-mode) in which liquid crystal molecules having a negative dielectric anisotropy are aligned generally perpendicularly to a panel surface of the liquid crystal display. A liquid crystal display according to the invention comprises a liquid crystal cell (6) of a vertical alignment mode, at least one polarizer (2, 10) arranged on each side of the liquid crystal cell, and at least one compensating structure (3, 7) disposed between the liquid crystal cell and at least one of the polarizers. The polarizers have transmission axes (11, 18) which are perpendicular to each other. [FR] La présente invention concerne généralement le domaine des dispositifs d'affichage à cristaux liquides et plus particulièrement un dispositif d'affichage à cristaux liquides fonctionnant en mode aligné verticalement (mode VA) dans lequel des molécules de cristaux liquides ayant une anisotropie diélectrique sont généralement alignées perpendiculairement par rapport à une surface de panneau de l'affichage à cristaux liquides. L'affichage à cristaux liquides selon l'invention comprend une cellule à cristaux liquides (6) d'un mode d'alignement vertical, au moins un polariseur (2, 10) disposé sur chaque côté de la cellule à cristaux liquides, et au moins une structure de compensation (3, 7) disposée entre la cellule à cristaux liquides et au moins un des polariseurs. Les polariseurs ont des axes de transmission (11, 18) qui sont perpendiculaires les uns aux autres.