| 摘要 |
<p>Liquid-crystal compounds represented by general formula (1) (wherein X1, X2 and X3 are each - CH2O-, -OCH2-, -(CH2)3O-, -O(CH2)3-, a covalent bond, -CF2O-, -OCF2-, -CH=CH-, -C IDENTICAL C-, -CH2CH2-, -(CH2)4-, -CH=CH-CH2CH2- or -CH2CH2-CH=CH-, with the proviso that at least one of them is -CH2O-, -OCH2-, -(CH2)3O- or -O(CH2)3-; R1 is C2-C20 alkenyl; Y1 is halogeno, cyano or substituted or unsubstituted C1-C20 alkyl; the rings A1, A2, A3 and A4 are each substituted or unsubstituted 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-phenylene; and m and n are each 0 or 1); and a liquid-crystal composition and a liquid-crystal display element containing at least one of these compounds. The compounds exhibit steep threshold value characteristics, an excellent compatibility, a low viscosity, a quick response, and so on. <CHEM></p> |
