Disclosed is a liquid crystal composition characterized by containing 15% by mass or more of a compound having a terminal structure represented by the general formula (I) below. This liquid crystal composition has high dielectric constant anisotropy (ε) and low rotational viscosity (γ1), and is thus suitably used as a liquid crystal composition for IPS liquid crystal displays or low voltage-driven TN liquid crystal displays. (I) (In the above formula, Q represents a saturated or unsaturated alkyl group having 1-8 carbon atoms which may be substituted by a halogen atom.)
US7198827B1
申请人:——
公开号:US7198827B1
公开(公告)日:2007-04-03
US7618554B2
申请人:——
公开号:US7618554B2
公开(公告)日:2009-11-17
An improved practical Pd/C-catalyzed Sonogashira cross-coupling reaction for the synthesis of liquid crystals of trans-cyclohexyltolans
An improved practical synthesis of liquid crystals of trans‐cyclohexyltolans by Sonogashira cross‐coupling reaction of 1‐iodo‐4‐(trans‐4‐alkylcyclohexyl)benzene with aromatic terminalalkynes in the presence of Pd/C (palladium on activated carbon) as low as 0.03 mol% of Pd and CuI (2 mol%) in a mixture solvent of acetone–water (5:2 in volume) is described. The liquid crystals could be obtained in high