1,3-dioxane derivatives, methods of preparation and liquid crystal
申请人:Seiko Epson Corporation
公开号:US05238599A1
公开(公告)日:1993-08-24
Trans-2-phenyl-5-trans-4'-alkylcyclohexyl-1,3-dioxane derivatives represented by the general formula: ##STR1## wherein R is a linear alkyl group of 1 to 10 carbon atoms, A is a single covalent bond or a --CH.sub.2 CH.sub.2 -- group, X is F or CN, Y is F if X is CN or Y is H or F if X is F, and the cyclohexane ring and the 1,3-dioxane ring are trans isomers. The 1,3-dioxane derivatives have large positive dielectric constant anisotropy (.DELTA..epsilon.), small birefringence (.DELTA.n) and have good compatibility with other liquid crystal compounds. The dioxane derivatives may be included in liquid crystal compositions for improved display devices having a low threshold voltage, a low driving voltage and a wide visual angle.
1,3-dioxane derivative and liquid crystal composition incorporating the same
申请人:SEIKO EPSON CORPORATION
公开号:EP0400861A1
公开(公告)日:1990-12-05
A 1,3-dioxane derivative of the general formula:
wherein, R is a straight chain alkyl group of 1 to 10 carbon atoms, A is a single bond or a -CH2-CH2- group, X is F or CN, Y is either F when X is CN or H or F when X is F, and the cyclohexane ring and the 1,3-dioxane ring are each in the trans configuration.
通式如下的 1,3-二恶烷衍生物: 其中,R 为 1 至 10 个碳原子的直链烷基,A 为单键或-CH2-CH2-基团,X 为 F 或 CN,Y 为 F(当 X 为 CN 时)或 H 或 F(当 X 为 F 时),环己烷环和 1,3-二恶烷环各自为反式构型。