Liquid Crystal Composition, Liquid Crystal Element, and Siloxane Polymer
申请人:Kato Takashi
公开号:US20080152843A1
公开(公告)日:2008-06-26
The present invention provides a liquid crystal composition including a siloxane polymer, a nematic liquid crystal compound substituted with at least one fluorine atom, and at least one dichroic dye; and a liquid crystal composition including a siloxane polymer having liquid crystalline group at the side chain of the polymer, a low molecular-weight liquid crystal compound, and a dichroic dye, in which the dielectric constant anisotropy of the liquid crystal composition is changed from being positive to being negative when the frequency of the voltage to be applied is increased.
US7780870B2
申请人:——
公开号:US7780870B2
公开(公告)日:2010-08-24
Selective para-Cyanation of Alkoxy- and Benzyloxy-Substituted Benzenes with Potassium Ferricyanide Promoted by Copper(II) Nitrate and Iodine
A simple method was developed for selective para-cyanation of alkoxy- and benzyloxy-substituted benzenes with 0.5 equivalents of potassium ferricyanide, 0.8 equivalants of copper(II) nitrate and 0.5 equivalents of iodine in acetonitrile. Among various phenyl carbon-hydrogen bonds, those at the para-position with regard to the alkoxy or benzyloxy groups were selectively cyanated in 20% to 87% yields