| 摘要 |
<p>Compounds having formula (I), in which R?1 and R2¿ represent independently of each other R, OR, OCOR, COOR or OCOOR, R represents an alkyl group with 1-15 C atoms, wherein one or more non-adjacent CH¿2? groups, not linked to O, can be substituted by -O-, -CO-, -O-CO-, -CO-O-, -CHhalogen, -CHCN- and/or -CH=CH-; A?1, A2 A3¿ represent independently of each other 1,4-phenylene or trans-1,4-cyclohexylene; m, n and o represent each 0 or 1; m+n+o equal to 0, 1 or 2; Z?1 and Z2¿ represent independently of each other -CH¿2?-O-, -OCH2-, -CH2CH2- or a simple bond; and X represents F, Cl, Br, J or CN. These compounds can be used in the conditions described under claim 1 as components of ferro-electric liquid crystal phases.</p> |
