Pfeiffer; Kollbach; Haack, Justus Liebigs Annalen der Chemie, 1928, vol. 460, p. 148
作者:Pfeiffer、Kollbach、Haack
DOI:——
日期:——
LIQUID CRYSTAL ALIGNING AGENT, METHOD FOR FORMING LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY DEVICE
申请人:JSR Corporation
公开号:EP2182406B1
公开(公告)日:2013-10-16
LIQUID CRYSTAL ALIGNMENT AGENT, LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY ELEMENT
申请人:Chi Mei Corporation
公开号:US20170022419A1
公开(公告)日:2017-01-26
A liquid crystal alignment agent capable of forming a liquid crystal alignment film having good pre-tilt angle light stability, the liquid crystal alignment film, and a liquid crystal display element having the liquid crystal alignment film are provided. The liquid crystal alignment agent includes a polymer (A), a photosensitive polysiloxane (B), and a solvent (C). The polymer (A) is obtained by reacting a mixture, wherein the mixture includes a tetracarboxylic dianhydride component (a1) and a diamine component (a2). The diamine component (a2) includes a diamine compound (a2-1) represented by formula (1). The photosensitive polysiloxane (B) is obtained by reacting a silane compound (b1-1) containing an epoxy group and a cinnamic acid derivative (b2).
Antibacterial chalcones––bioisosteric replacement of the 4′-hydroxy group
Hydroxy chalcones, for example, Licochalcone A, has for several years been known to be antibacterial. The low aqueous solubility and the medium antibacterial potency have limited the usefulness of the compounds. We describe the bioisosteric replacement of the essential 4'-hydroxy group in the hydroxy chalcones with bioisosters of varied degrees of acidity resulting in both more potent and more soluble compounds. The more acidic 4'-hydroxy analogues (e.g., 3'-fluoro- or 3',5'-difluoro-) gave almost inactive compounds whereas exchanging the hydroxy group with a carboxy group resulted in a potent compound with a high aqueous solubility. Further optimisation and SAR-analysis resulted in soluble and potent carboxy chalcones [e.g., 3,5-dibromo- and 3,5-di(trifluoromethyl)-]. (C) 2004 Elsevier Ltd. All rights reserved.